| Species |
Recipient region |
Date of the first record |
|
| Abra segmentum | Russia / Caspian Sea | 1955 |  |
| Abudefduf sexfasciatus | Greece / Eastern Mediterranean | 2017 | |
| Abudefduf vaigiensis | France / Western Mediterranean | 2000 | |
| Abudefduf vaigiensis | Israel | 1997 | |
| Abudefduf vaigiensis | Italy / Western Mediterranean | 1957 | |
| Acanthogobius flavimanus | Australia / Bass strait | 1990 | |
| Acanthophora nayadiformis | France / Western Mediterranean | To 1977 | |
| Acanthophora nayadiformis | Greece / Central Mediterranean | 1987 | |
| Acanthophora nayadiformis | Greece / Eastern Mediterranean | 1861 | |
| Acanthophora nayadiformis | Israel | 1949 | |
| Acanthosiphonia echinata | Italy / Adriatic Sea | 2018 | |
| Acanthurus chirurgus | Italy / Western Mediterranean | 2012 | |
| Acanthurus coeruleus | Israel | 2014 | |
| Acanthurus monroviae | Portugal / Iberian Coastal | 2007 | |
| Acanthurus sohal | Greece / Eastern Mediterranean | 2017 | |
| Acar plicata | Israel | 1978 | |
| Acartia (Acanthacartia) tonsa | Belgium | 1956 | |
| Acartia (Acanthacartia) tonsa | Bulgaria | 2000 | |
| Acartia (Acanthacartia) tonsa | Denmark / Baltic Sea | 1921 - 1925 | |
| Acartia (Acanthacartia) tonsa | Denmark / North Sea | 1921 | |
| Acartia (Acanthacartia) tonsa | Estonia | 1924 | |
| Acartia (Acanthacartia) tonsa | Finland | 1930 | |
| Acartia (Acanthacartia) tonsa | France / Biscay Gulf | 1927 | |
| Acartia (Acanthacartia) tonsa | France / English Channel | 1927 | |
| Acartia (Acanthacartia) tonsa | France / Western Mediterranean | 1966 | |
| Acartia (Acanthacartia) tonsa | Georgia | 2002 | |
| Acartia (Acanthacartia) tonsa | Germany / Baltic Sea | 1981 | |
| Acartia (Acanthacartia) tonsa | Germany / North Sea | 1930 | |
| Acartia (Acanthacartia) tonsa | Greece / Central Mediterranean | 2005 | |
| Acartia (Acanthacartia) tonsa | Iran / Caspian Sea | From 1981 | |
| Acartia (Acanthacartia) tonsa | Ireland | 2019 | |
| Acartia (Acanthacartia) tonsa | Italy / Adriatic Sea | 1987 - 1988 | |
| Acartia (Acanthacartia) tonsa | Italy / Western Mediterranean | 1986 | |
| Acartia (Acanthacartia) tonsa | Latvia | 1924 | |
| Acartia (Acanthacartia) tonsa | Lithuania | 1920 - 1930 | |
| Acartia (Acanthacartia) tonsa | Netherlands | 1913 - 1915 | |
| Acartia (Acanthacartia) tonsa | Norway / North Sea | 1980 - 2012 | |
| Acartia (Acanthacartia) tonsa | Poland | 1925 | |
| Acartia (Acanthacartia) tonsa | Portugal / Iberian Coastal | To 1985 | |
| Acartia (Acanthacartia) tonsa | Russia / Baltic Sea / Kaliningrad area | 1930 - 1950 | |
| Acartia (Acanthacartia) tonsa | Russia / Baltic Sea / St. Petersburg area | 1934 | |
| Acartia (Acanthacartia) tonsa | Spain / Iberian Coastal | 2001 | |
| Acartia (Acanthacartia) tonsa | Sweden / Baltic Sea | 1934 | |
| Acartia (Acanthacartia) tonsa | Sweden / North Sea | 1920 - 1930 | |
| Acartia (Acanthacartia) tonsa | Turkey / Black Sea | 1996 | |
| Acartia (Acanthacartia) tonsa | Ukraine / Black Sea | From 1976 | |
| Acartia (Acanthacartia) tonsa | United Kingdom (Britain) / English Channel | 1956 | |
| Acartia (Acanthacartia) tonsa | United Kingdom (Britain) / North Sea | 1956 - 1986 | |
| Acartia (Acartiura) clausi | Russia / Caspian Sea | 1981 | |
| Acartia (Acartiura) omorii | France / English Channel | 2004 | |
| Acartia (Acartiura) omorii | France / North Sea | 2004 | |
| Acartia (Odontacartia) centrura | Israel | 1968 | |
| Acentrogobius pflaumii | Australia / Bass strait | 1996 | |
| Achelia sawayai | Italy / Central Mediterranean | 2016 | |
| Achnanthes pseudogroenlandica | Bulgaria | 1984 | |
| Achnanthes pseudogroenlandica | Romania | 1984 | |
| Achnanthes pseudogroenlandica | Ukraine / Black Sea | From 1984 | |
| Acinetospora crinita | Australia / Bass strait | 1971 | |
| Acipenser baeri | Denmark / Baltic Sea | 2005 | |
| Acipenser baeri | Estonia | 1962 | |
| Acipenser baeri | Finland | 1960 - 1970 | |
| Acipenser baeri | France / Biscay Gulf | 1999 | |
| Acipenser baeri | France / Celtic seas | 1999 | |
| Acipenser baeri | Germany / Baltic Sea | 1980 - 1989 | |
| Acipenser baeri | Germany / North Sea | 1980 - 1989 | |
| Acipenser baeri | Latvia | 1962 | |
| Acipenser baeri | Lithuania | 1962 | |
| Acipenser baeri | Netherlands | To 1990 | |
| Acipenser baeri | Poland | 1985 | |
| Acipenser baeri | Russia / Baltic Sea / Kaliningrad area | 1960 - 1969 | |
| Acipenser baeri | Russia / Baltic Sea / St. Petersburg area | 1964 - 1967 | |
| Acipenser gueldenstaedtii | Denmark / Baltic Sea | 1995 | |
| Acipenser gueldenstaedtii | Denmark / North Sea | 2010 | |
| Acipenser gueldenstaedtii | Estonia | 1962 - 1969 | |
| Acipenser gueldenstaedtii | Finland | 2000 | |
| Acipenser gueldenstaedtii | Germany / Baltic Sea | 1990 - 1999 | |
| Acipenser gueldenstaedtii | Latvia | 1962 | |
| Acipenser gueldenstaedtii | Netherlands | To 1990 | |
| Acipenser gueldenstaedtii | Poland | 1985 | |
| Acipenser gueldenstaedtii | Russia / Baltic Sea / St. Petersburg area | 1964 - 1966 | |
| Acipenser gueldenstaedtii | Sweden / Baltic Sea | 1966 | |
| Acipenser ruthenus | Finland | 1958 | |
| Acipenser ruthenus | Latvia | 1888 | |
| Acipenser ruthenus | Lithuania | 1885 | |
| Acipenser ruthenus | Netherlands | To 1990 | |
| Acipenser ruthenus | Poland | 1937 | |
| Acipenser ruthenus | Russia / Baltic Sea / Kaliningrad area | 1885 | |
| Acipenser ruthenus | Russia / Baltic Sea / St. Petersburg area | 1763 | |
| Acipenser ruthenus | Sweden / Baltic Sea | 1887 | |
| Acipenser stellatus | Denmark / Baltic Sea | 2010 | |
| Acipenser stellatus | Finland | 1999 | |
| Acipenser stellatus | Germany / Baltic Sea | To 2006 | |
| Acipenser transmontanus | Germany / North Sea | To 1999 | |
| Acorus calamus | India / Eastern Arabian | 2005 | |
| Acrochaetium catenulatum | Netherlands | 1967 | |
| Acrochaetium kylinii | Turkey / Black Sea | 2000 - 2009 | |
| Acrochaetium leptonema | Bulgaria | 2000 - 2009 | |
| Acrochaetium leptonema | Turkey / Black Sea | 2000 - 2009 | |
| Acrochaetium mahumetanum | Romania | 1938 | |
| Acrochaetium mahumetanum | Turkey / Black Sea | 2000 - 2009 | |
| Acrochaetium mediterraneum | Turkey / Black Sea | 2000 - 2009 | |
| Acrochaetium microscopicum | Turkey / Black Sea | 2000 - 2009 | |
| Acrochaetium moniliforme | Turkey / Black Sea | 2000 - 2009 | |
| Acrochaetium pacificum | Australia / Bass strait | 1981 | |
| Acrochaetium rosulatum | Bulgaria | 1990 - 1999 | |
| Acrochaetium rosulatum | Turkey / Black Sea | 2000 - 2009 | |
| Acrochaetium savianum | Netherlands | 1960 - 1969 | |
| Acrochaetium subpinnatum | Turkey / Black Sea | 2000 - 2009 | |
| Acromegalomma claparedei | Italy / Adriatic Sea | 1987 | |
| Acrothamnion preissii | France / Western Mediterranean | 1981 | |
| Acrothamnion preissii | Italy / Adriatic Sea | 2007 | |
| Acrothamnion preissii | Italy / Central Mediterranean | 1996 | |
| Acrothamnion preissii | Italy / Western Mediterranean | 1969 | |
| Acrothrix gracilis | France / Western Mediterranean | 1993 | |
| Actaea savignyii | Israel | 2010 | |
| Actaeodes tomentosus | Greece / Eastern Mediterranean | 2013 | |
| Acteocina mucronata | Greece / Eastern Mediterranean | 1991 | |
| Acteocina mucronata | Israel | 1986 | |
| Adelosina carinatastriata | France / Biscay Gulf | To 2007 | |
| Aeolidiella indica | Italy / Western Mediterranean | 1968 | |
| Aequorea macrodactyla | Israel | 2013 | |
| Aerococcus viridans | Ireland | 1961 | |
| Aerococcus viridans | United Kingdom (Britain) / Celtic seas | 1985 | |
| Aeromonas salmonicida salmonicida | Norway / Barents Sea | 1986 | |
| Aeromonas salmonicida salmonicida | Norway / North Sea | 1986 | |
| Aeromonas salmonicida salmonicida | Norway / Norwegian Sea | 1986 | |
| Aetea anguina | Australia / Bass strait | 1887 | |
| Aetea anguina | Spain / Canary Islands | To 2003 | |
| Aetea ligulata | Spain / Canary Islands | To 2003 | |
| Aetea longicollis | Spain / Canary Islands | To 2003 | |
| Aetea sica | Spain / Canary Islands | To 2003 | |
| Aetea truncata | Spain / Canary Islands | To 2003 | |
| Afrocardium richardi | Israel | 1997 | |
| Afropinnotheres monodi | Portugal / Iberian Coastal | To 2019 | |
| Afropinnotheres monodi | Spain / Iberian Coastal | 1995 | |
| Agardhiella subulata | France / Western Mediterranean | 1984 | |
| Agardhiella subulata | Italy / Adriatic Sea | 2003 | |
| Agardhiella subulata | Italy / Central Mediterranean | 1987 | |
| Agardhiella subulata | Italy / Western Mediterranean | 2007 | |
| Agardhiella subulata | Netherlands | 1998 | |
| Agarophyton vermiculophyllum | Belgium | To 2011 | |
| Agarophyton vermiculophyllum | Canada / Gulf of Alaska | 2006 | |
| Agarophyton vermiculophyllum | Denmark / Baltic Sea | 2003 | |
| Agarophyton vermiculophyllum | Denmark / North Sea | 2005 | |
| Agarophyton vermiculophyllum | France / Biscay Gulf | 2005 | |
| Agarophyton vermiculophyllum | France / Celtic seas | 1996 | |
| Agarophyton vermiculophyllum | France / English Channel | 1993 | |
| Agarophyton vermiculophyllum | Germany / Baltic Sea | 2005 | |
| Agarophyton vermiculophyllum | Germany / North Sea | 2002 | |
| Agarophyton vermiculophyllum | Ireland | 2012 | |
| Agarophyton vermiculophyllum | Italy / Adriatic Sea | 2008 | |
| Agarophyton vermiculophyllum | Mexico / California Current | 1979 | |
| Agarophyton vermiculophyllum | Netherlands | 1994 | |
| Agarophyton vermiculophyllum | Norway / North Sea | 2012 | |
| Agarophyton vermiculophyllum | Portugal / Iberian Coastal | From 1989 | |
| Agarophyton vermiculophyllum | Spain / Iberian Coastal | To 2003 | |
| Agarophyton vermiculophyllum | Sweden / North Sea | 2003 | |
| Agarophyton vermiculophyllum | United Kingdom (Britain) / Celtic seas | 2008 - 2013 | |
| Agarophyton vermiculophyllum | United Kingdom (Britain) / English Channel | 2015 | |
| Agarophyton vermiculophyllum | USA / California Current | 1994 | |
| Agarophyton vermiculophyllum | USA / Gulf of Alaska | 2017 | |
| Agarophyton vermiculophyllum | USA / Hudson river | 2000 | |
| Agarophyton vermiculophyllum | USA / Mid-Atlantic Bight | To 1998 | |
| Aglaothamnion cordatum | Portugal / Azores | 2005 - 2007 | |
| Aglaothamnion feldmanniae | France / Western Mediterranean | 1979 | |
| Aglaothamnion feldmanniae | Italy / Adriatic Sea | 2003 | |
| Aglaothamnion feldmanniae | Italy / Western Mediterranean | 1975 | |
| Aglaothamnion feldmanniae | United Kingdom (Britain) / English Channel | | |
| Aglaothamnion halliae | Denmark / Baltic Sea | 2003 | |
| Aglaothamnion halliae | Denmark / North Sea | 2003 | |
| Aglaothamnion halliae | Germany / North Sea | 1960 | |
| Aglaothamnion halliae | Italy / Adriatic Sea | 2016 | |
| Aglaothamnion halliae | Norway / North Sea | 1980 - 1989 | |
| Aglaothamnion halliae | Sweden / North Sea | 2003 | |
| Ahnfeltiopsis flabelliformis | France / Western Mediterranean | 1995 | |
| Ahnfeltiopsis furcellata | Turkey / Black Sea | 1990 - 1999 | |
| Aiptasia diaphana | Portugal / Madeira | 1994 | |
| Aiptasia pulchella | France / Biscay Gulf | 1973 | |
| Aiptasia pulchella | France / Celtic seas | 1974 | |
| Akashiwo sanguinea | Denmark / Baltic Sea | 1983 | |
| Akashiwo sanguinea | Denmark / North Sea | 1982 | |
| Alectryonella plicatula | Israel | 2005 | |
| Alepes djedaba | Greece / Central Mediterranean | 1987 | |
| Alepes djedaba | Greece / Eastern Mediterranean | 1960 | |
| Alepes djedaba | Israel | 1924 - 1925 | |
| Alexandrium acatenella | Ukraine / Black Sea | From 2001 | |
| Alexandrium affine | France / Biscay Gulf | 1987 | |
| Alexandrium affine | France / English Channel | 1988 | |
| Alexandrium affine | Ukraine / Black Sea | From 2001 | |
| Alexandrium catenella | Australia / Bass strait | 1988 | |
| Alexandrium catenella | France / Western Mediterranean | To 1998 | |
| Alexandrium leei | Denmark / Baltic Sea | 2006 | |
| Alexandrium leei | Denmark / North Sea | 2006 | |
| Alexandrium leei | France / Biscay Gulf | 1993 | |
| Alexandrium leei | France / Celtic seas | 1995 | |
| Alexandrium leei | France / English Channel | 1993 | |
| Alexandrium leei | Netherlands | 1991 | |
| Alexandrium margalefii | Denmark / Baltic Sea | 2006 | |
| Alexandrium margalefii | Denmark / North Sea | 2006 | |
| Alexandrium minutum | Bulgaria | 2008 | |
| Alexandrium minutum | Denmark / Baltic Sea | 1992 | |
| Alexandrium minutum | Denmark / North Sea | 1998 | |
| Alexandrium minutum | France / Biscay Gulf | 1985 | |
| Alexandrium minutum | France / Celtic seas | 1985 | |
| Alexandrium minutum | France / English Channel | To 1988 | |
| Alexandrium minutum | France / North Sea | 1990 | |
| Alexandrium minutum | France / Western Mediterranean | 1988 | |
| Alexandrium minutum | Germany / Baltic Sea | To 1993 | |
| Alexandrium minutum | Germany / North Sea | 1990 - 1999 | |
| Alexandrium minutum | Netherlands | To 1992 | |
| Alexandrium minutum | Russia / Black Sea | 2000 | |
| Alexandrium minutum | Sweden / North Sea | To 1996 | |
| Alexandrium minutum | Turkey / Black Sea | 2002 - 2003 | |
| Alexandrium monilatum | Bulgaria | 1991 | |
| Alexandrium monilatum | Ukraine / Black Sea | 2001 | |
| Alexandrium ostenfeldii | Denmark / Baltic Sea | 1986 | |
| Alexandrium ostenfeldii | Denmark / North Sea | 1986 | |
| Alexandrium ostenfeldii | Netherlands | To 2018 | |
| Alexandrium ostenfeldii | Poland | 2001 | |
| Alexandrium ostenfeldii | Russia / Black Sea | 2004 | |
| Alexandrium pseudogonyaulax | Denmark / Baltic Sea | 2007 | |
| Alexandrium pseudogonyaulax | Denmark / North Sea | 2007 | |
| Alexandrium pseudogonyaulax | Germany / Baltic Sea | To 2010 | |
| Alexandrium pseudogonyaulax | Ukraine / Black Sea | From 2002 | |
| Alexandrium tamarense | Australia / Bass strait | 1993 | |
| Alexandrium tamarense | Bulgaria | 2008 | |
| Alexandrium tamarense | Denmark / Baltic Sea | 1983 | |
| Alexandrium tamarense | Denmark / North Sea | 1983 | |
| Alexandrium tamarense | Faroe Islands | To 2003 | |
| Alexandrium tamarense | France / Western Mediterranean | To 1998 | |
| Alexandrium tamarense | Germany / North Sea | To 1972 | |
| Alexandrium tamarense | Ireland | To 1986 | |
| Alexandrium tamarense | Netherlands | 1989 | |
| Alexandrium tamarense | Norway / North Sea | To 2001 | |
| Alexandrium tamarense | Romania | 2004 | |
| Alexandrium tamarense | Russia / Black Sea | 2004 | |
| Alexandrium tamarense | Turkey / Black Sea | 2007 - 2008 | |
| Alexandrium tamarense | Ukraine / Black Sea | From 2001 | |
| Alexandrium taylori | France / Biscay Gulf | 1994 | |
| Alexandrium taylori | France / Celtic seas | 1994 | |
| Aliculastrum cylindricum | Israel | 2002 | |
| Alitta succinea | Australia / Bass strait | 1978 | |
| Alitta succinea | Denmark / Baltic Sea | 1940 | |
| Alitta succinea | Denmark / North Sea | 1940 | |
| Alitta succinea | Germany / Baltic Sea | To 2016 | |
| Alitta succinea | United Kingdom (Britain) / North Sea | 1959 | |
| Alitta virens | Germany / Baltic Sea | 1920 | |
| Alitta virens | Germany / North Sea | 1923 | |
| Alitta virens | Netherlands | 1903 | |
| Alitta virens | United Kingdom (Britain) / Celtic seas | 1800 - 1900 | |
| Alitta virens | United Kingdom (Britain) / English Channel | 1800 - 1900 | |
| Alitta virens | United Kingdom (Britain) / North Sea | 1800 - 1900 | |
| Alkmaria romijni | Denmark / Baltic Sea | 1975 | |
| Alkmaria romijni | Denmark / North Sea | 1929 | |
| Alkmaria romijni | Netherlands | 1919 | |
| Alkmaria romijni | Norway / North Sea | To 1997 | |
| Alkmaria romijni | Russia / Baltic Sea / Kaliningrad area | 1996 | |
| Alkmaria romijni | Sweden / Baltic Sea | 1960 - 1972 | |
| Alloeocarpa loculosa | Portugal / Azores | To 1971 | |
| Allolepidapedon fistularia | Italy / Western Mediterranean | 2005 | |
| Allolepidapedon fistulariae | Israel | 2007 | |
| Alpheus dentipes | Bulgaria | 1966 | |
| Alpheus edwardsii | Israel | 1951 | |
| Alpheus lobidens | Israel | 1951 | |
| Alpheus migrans | Israel | 1977 | |
| Alpheus rapacida | Greece / Eastern Mediterranean | 1998 | |
| Alpheus rapacida | Israel | 1960 | |
| Alveinus miliaceus | Israel | 2016 | |
| Amathia distans | Australia / Bass strait | To 1999 | |
| Amathia gracilis | Germany / Baltic Sea | 1990 - 1999 | |
| Amathia gracilis | Germany / North Sea | 1990 - 1999 | |
| Amathia gracilis | Netherlands | To 1969 | |
| Amathia gracilis | United Kingdom (Britain) / Celtic seas / Channel Islands | 1960 - 1969 | |
| Amathia gracilis | United Kingdom (Britain) / English Channel | 2002 | |
| Amathia gracilis | United Kingdom (Britain) / North Sea | To 1996 | |
| Amathia imbricata | Germany / Baltic Sea | To 2015 | |
| Amathia imbricata | Germany / North Sea | To 2015 | |
| Amathia verticillata | France / Western Mediterranean | 2015 | |
| Amathia verticillata | Greece / Central Mediterranean | 1980 | |
| Amathia verticillata | Greece / Eastern Mediterranean | 1969 | |
| Amathia verticillata | Israel | 1960 | |
| Amathia verticillata | Italy / Adriatic Sea | To 1867 | |
| Amathia verticillata | Italy / Central Mediterranean | 1952 | |
| Amathia verticillata | Italy / Western Mediterranean | To 1822 | |
| Amathia verticillata | Portugal / Azores | 2009 | |
| Amathia verticillata | Portugal / Madeira | 2008 | |
| Amathia verticillata | Spain / Canary Islands | To 2011 | |
| Amathia verticillata | Spain / Iberian Coastal | To 2011 | |
| Amathia verticillata | Taiwan / South China Sea | 2015 | |
| Amathina tricarinata | Israel | 2004 | |
| Ameira divagans divagans | Germany / Baltic Sea | 1970 | |
| Ameira divagans divagans | Sweden / North Sea | | |
| Ammonia confertitesta | France / Biscay Gulf | 2019 | |
| Ammonia confertitesta | France / English Channel | 2019 | |
| Ammonia tepida | France / Biscay Gulf | 1970 | |
| Ammonia tepida | France / Celtic seas | 1970 | |
| Ammonia tepida | France / English Channel | 1970 | |
| Ammonia tepida | France / North Sea | 1970 | |
| Ammothea hilgendorfi | Belgium | 2013 | |
| Ammothea hilgendorfi | France / Biscay Gulf | 2019 | |
| Ammothea hilgendorfi | France / Western Mediterranean | 2019 | |
| Ammothea hilgendorfi | Italy / Adriatic Sea | 1979 | |
| Ammothea hilgendorfi | Netherlands | 2013 | |
| Ammothea hilgendorfi | United Kingdom (Britain) / English Channel | 1978 | |
| Ampelisca cavicoxa | Spain / Iberian Coastal | 2005 | |
| Ampelisca heterodactyla | Portugal / Iberian Coastal | To 1986 | |
| Ampelisca heterodactyla | Spain / Iberian Coastal | 1993 | |
| Amphiascus tenuiremis | Ukraine / Black Sea | From 1996 | |
| Amphibalanus amphitrite | Belgium | To 1952 | |
| Amphibalanus amphitrite | France / Biscay Gulf | 1914 | |
| Amphibalanus amphitrite | France / English Channel | 1928 | |
| Amphibalanus amphitrite | France / North Sea | 1982 | |
| Amphibalanus amphitrite | France / Western Mediterranean | 1973 | |
| Amphibalanus amphitrite | Germany / North Sea | To 2002 | |
| Amphibalanus amphitrite | Netherlands | 1962 | |
| Amphibalanus amphitrite | Portugal / Azores | To 1889 | |
| Amphibalanus amphitrite | Portugal / Iberian Coastal | 1982 | |
| Amphibalanus amphitrite | Portugal / Madeira | 2005 | |
| Amphibalanus amphitrite | Romania | 1844 | |
| Amphibalanus amphitrite | Spain / Iberian Coastal | To 2016 | |
| Amphibalanus amphitrite | Ukraine / Black Sea | 1905 | |
| Amphibalanus eburneus | Bulgaria | 1933 | |
| Amphibalanus eburneus | France / Biscay Gulf | 1872 | |
| Amphibalanus eburneus | France / Celtic seas | 1940 | |
| Amphibalanus eburneus | France / Western Mediterranean | 1973 | |
| Amphibalanus eburneus | Greece / Eastern Mediterranean | 1970 | |
| Amphibalanus eburneus | Iran / Caspian Sea | 2014 | |
| Amphibalanus eburneus | Italy / Adriatic Sea | From 1864 | |
| Amphibalanus eburneus | Italy / Central Mediterranean | To 1864 | |
| Amphibalanus eburneus | Italy / Western Mediterranean | From 1864 | |
| Amphibalanus eburneus | Japan / Sea of Japan | 1960 - 1969 | |
| Amphibalanus eburneus | Korea, Republic of / Sea of Japan | To 1992 | |
| Amphibalanus eburneus | Netherlands | 1890 - 1899 | |
| Amphibalanus eburneus | Portugal / Azores | To 1998 | |
| Amphibalanus eburneus | Russia / Caspian Sea | 1956 | |
| Amphibalanus eburneus | Spain / Iberian Coastal | To 2016 | |
| Amphibalanus eburneus | Turkey / Black Sea | 1968 | |
| Amphibalanus eburneus | Ukraine / Black Sea | From 1892 | |
| Amphibalanus improvisus | Belgium | To 1700 | |
| Amphibalanus improvisus | Bulgaria | 1844 | |
| Amphibalanus improvisus | Denmark / Baltic Sea | 1880 | |
| Amphibalanus improvisus | Denmark / North Sea | 1880 | |
| Amphibalanus improvisus | Estonia | 1801 - 1850 | |
| Amphibalanus improvisus | Finland | 1801 - 1860 | |
| Amphibalanus improvisus | France / Biscay Gulf | To 1901 | |
| Amphibalanus improvisus | France / Celtic seas | 1872 | |
| Amphibalanus improvisus | France / English Channel | To 1900 | |
| Amphibalanus improvisus | Georgia | 1978 - 1982 | |
| Amphibalanus improvisus | Germany / Baltic Sea | 1867 | |
| Amphibalanus improvisus | Germany / North Sea | 1858 | |
| Amphibalanus improvisus | Ireland | To 1950 | |
| Amphibalanus improvisus | Italy / Adriatic Sea | To 1951 | |
| Amphibalanus improvisus | Italy / Central Mediterranean | To 1942 | |
| Amphibalanus improvisus | Italy / Western Mediterranean | 1979 | |
| Amphibalanus improvisus | Latvia | 1801 - 1889 | |
| Amphibalanus improvisus | Lithuania | 1844 | |
| Amphibalanus improvisus | Netherlands | 1827 | |
| Amphibalanus improvisus | Norway / North Sea | 1800 - 1809 | |
| Amphibalanus improvisus | Norway / Norwegian Sea | 1800 - 1809 | |
| Amphibalanus improvisus | Poland | 1844 | |
| Amphibalanus improvisus | Portugal / Azores | 1887 | |
| Amphibalanus improvisus | Portugal / Iberian Coastal | 1974 | |
| Amphibalanus improvisus | Romania | 1844 | |
| Amphibalanus improvisus | Russia / Baltic Sea / Kaliningrad area | 1801 - 1889 | |
| Amphibalanus improvisus | Russia / Baltic Sea / St. Petersburg area | 1934 | |
| Amphibalanus improvisus | Spain / Iberian Coastal | 1900 | |
| Amphibalanus improvisus | Sweden / Baltic Sea | 1844 - 1899 | |
| Amphibalanus improvisus | Sweden / North Sea | 1844 - 1919 | |
| Amphibalanus improvisus | Turkey / Black Sea | 2005 | |
| Amphibalanus improvisus | Ukraine / Azov Sea | From 1844 | |
| Amphibalanus improvisus | Ukraine / Black Sea | From 1844 | |
| Amphibalanus improvisus | United Kingdom (Britain) / Celtic seas | 1854 | |
| Amphibalanus improvisus | United Kingdom (Britain) / North Sea | 1500 - 1854 | |
| Amphibalanus reticulatus | Belgium | 1997 | |
| Amphibalanus reticulatus | France / English Channel | 2001 | |
| Amphibalanus reticulatus | France / North Sea | 2001 | |
| Amphibalanus reticulatus | France / Western Mediterranean | 1977 | |
| Amphibalanus reticulatus | Israel | 2003 | |
| Amphibalanus variegatus | Belgium | 1997 | |
| Amphibalanus variegatus | France / English Channel | 1997 | |
| Amphibalanus variegatus | France / North Sea | 1997 | |
| Amphicorina pectinata | Spain / Iberian Coastal | To 2017 | |
| Amphioctopus aegina | Israel | 1934 | |
| Amphiroa rigida | Turkey / Black Sea | 1990 - 1999 | |
| Amphisbetia operculata | Australia / Bass strait | 1884 | |
| Amphisorus hemprichii | Italy / Central Mediterranean | 2005 | |
| Amphistegina lessonii | Italy / Central Mediterranean | 2005 | |
| Amphistegina lobifera | Greece / Central Mediterranean | 1955 - 1961 | |
| Amphistegina lobifera | Greece / Eastern Mediterranean | 1955 - 1961 | |
| Amphistegina lobifera | Italy / Central Mediterranean | 2005 | |
| Amphiura parviscutata | Australia / Bass strait | 1966 | |
| Amphogona pusilla | Italy / Western Mediterranean | 1972 | |
| Amphorellopsis acuta | Russia / Black Sea | 2010 | |
| Amphorellopsis acuta | Ukraine / Black Sea | 2011 | |
| Ampithoe valida | France / Biscay Gulf | 2014 | |
| Ampithoe valida | Netherlands | To 2013 | |
| Ampithoe valida | Portugal / Iberian Coastal | 1993 | |
| Anadara diluvii | Spain / Iberian Coastal | 1996 | |
| Anadara inaequivalvis | Bulgaria | 1982 | |
| Anadara inaequivalvis | Georgia | 1978 | |
| Anadara inaequivalvis | Romania | 1984 | |
| Anadara inaequivalvis | Russia / Azov Sea | 1989 | |
| Anadara inaequivalvis | Russia / Black Sea | 1980 - 1990 | |
| Anadara inaequivalvis | Turkey / Black Sea | 1980 - 1990 | |
| Anadara inaequivalvis | Ukraine / Azov Sea | From 1987 | |
| Anadara inaequivalvis | Ukraine / Black Sea | From 1987 | |
| Anadara kagoshimensis | Italy / Adriatic Sea | 1969 | |
| Anadara kagoshimensis | Spain / Iberian Coastal | 1993 - 1994 | |
| Anadara kagoshimensis | Turkey / Black Sea | 2003 | |
| Anadara natalensis | Israel | 1935 | |
| Anadara transversa | Greece / Eastern Mediterranean | 1993 | |
| Anadara transversa | Italy / Adriatic Sea | 1970 - 1980 | |
| Anadara transversa | Italy / Central Mediterranean | 2007 | |
| Anadara transversa | Italy / Western Mediterranean | 2005 | |
| Angiola punctostriata | Israel | 1950 | |
| Anguillicoloides crassus | Belgium | To 1989 | |
| Anguillicoloides crassus | Denmark / Baltic Sea | 1987 - 1989 | |
| Anguillicoloides crassus | Denmark / North Sea | To 1985 | |
| Anguillicoloides crassus | Estonia | 1989 | |
| Anguillicoloides crassus | Finland | 2002 | |
| Anguillicoloides crassus | France / Biscay Gulf | 1980 | |
| Anguillicoloides crassus | France / English Channel | 1980 | |
| Anguillicoloides crassus | France / North Sea | 1980 | |
| Anguillicoloides crassus | Germany / Baltic Sea | 1960 - 1987 | |
| Anguillicoloides crassus | Germany / North Sea | 1982 | |
| Anguillicoloides crassus | Ireland | 1998 | |
| Anguillicoloides crassus | Italy / Adriatic Sea | 1997 | |
| Anguillicoloides crassus | Italy / Western Mediterranean | 2001 - 2011 | |
| Anguillicoloides crassus | Latvia | 1998 | |
| Anguillicoloides crassus | Lithuania | 1998 | |
| Anguillicoloides crassus | Netherlands | To 1985 | |
| Anguillicoloides crassus | Norway / North Sea | 1994 | |
| Anguillicoloides crassus | Poland | 1988 | |
| Anguillicoloides crassus | Portugal / Iberian Coastal | 1992 | |
| Anguillicoloides crassus | Russia / Baltic Sea / Kaliningrad area | 1988 | |
| Anguillicoloides crassus | Sweden / Baltic Sea | 1987 | |
| Anguillicoloides crassus | Sweden / North Sea | 1989 | |
| Anguillicoloides crassus | United Kingdom (Britain) / English Channel | From 1987 | |
| Anguillicoloides crassus | United Kingdom (Britain) / North Sea | 1987 | |
| Anomia chinensis | France / Biscay Gulf | 1971 | |
| Anomia chinensis | France / Celtic seas | 1974 | |
| Anomia ephippium | Netherlands | 1935 | |
| Anoplodactylus californicus | Israel | 1951 | |
| Anoplodactylus californicus | Italy / Western Mediterranean | 1965 | |
| Anoplodactylus digitatus | Israel | 1951 | |
| Anotrichium furcellatum | France / Celtic seas | 1922 | |
| Anotrichium furcellatum | France / English Channel | To 1922 | |
| Anotrichium furcellatum | Greece / Eastern Mediterranean | 1971 - 1973 | |
| Anotrichium furcellatum | Israel | 1958 | |
| Anotrichium furcellatum | Netherlands | 1950 | |
| Anotrichium furcellatum | Portugal / Azores | 2005 - 2007 | |
| Anotrichium furcellatum | Portugal / Iberian Coastal | To 1960 | |
| Anotrichium furcellatum | Portugal / Madeira | 1970 | |
| Anotrichium furcellatum | Spain / Canary Islands | To 2004 | |
| Anotrichium furcellatum | Spain / Iberian Coastal | 1979 | |
| Antennella secundaria | Australia / Bass strait | 1910 | |
| Anthopleura anjunae | Spain / Iberian Coastal | To 2016 | |
| Anthopleura elegantissima | Spain / Iberian Coastal | To 2016 | |
| Antithamnion amphigeneum | France / Western Mediterranean | To 1998 | |
| Antithamnion amphigeneum | Italy / Central Mediterranean | 2005 | |
| Antithamnion amphigeneum | Italy / Western Mediterranean | 1996 | |
| Antithamnion amphigeneum | Portugal / Iberian Coastal | To 2004 | |
| Antithamnion amphigeneum | Spain / Iberian Coastal | 1995 | |
| Antithamnion densum | France / Biscay Gulf | 1964 | |
| Antithamnion densum | France / Celtic seas | 1964 | |
| Antithamnion densum | France / English Channel | 1964 | |
| Antithamnion densum | France / North Sea | 1981 | |
| Antithamnion densum | Ireland | 1991 | |
| Antithamnion densum | Portugal / Azores | 2005 | |
| Antithamnion densum | Portugal / Iberian Coastal | 2004 | |
| Antithamnion densum | Spain / Canary Islands | To 2006 | |
| Antithamnion densum | Spain / Iberian Coastal | 1984 - 1995 | |
| Antithamnion diminuatum | Portugal / Azores | 1989 | |
| Antithamnion diminuatum | Spain / Canary Islands | To 1996 | |
| Antithamnion hubbsii | France / Biscay Gulf | 2011 | |
| Antithamnion hubbsii | France / English Channel | 2018 | |
| Antithamnion hubbsii | France / Western Mediterranean | 1988 | |
| Antithamnion hubbsii | Norway / North Sea | To 2007 | |
| Antithamnion nipponicum | Italy / Adriatic Sea | 1994 | |
| Antithamnion nipponicum | Norway / North Sea | 2007 | |
| Antithamnion nipponicum | Portugal / Azores | 1989 | |
| Antithamnion nipponicum | Portugal / Iberian Coastal | From 2008 | |
| Antithamnion nipponicum | United Kingdom (Britain) / North Sea / Orkney Islands | 2020 | |
| Antithamnion pectinatum | France / Western Mediterranean | 1983 | |
| Antithamnion pectinatum | Portugal / Azores | To 1994 | |
| Antithamnion pectinatum | Portugal / Iberian Coastal | To 2008 | |
| Antithamnionella boergesenii | France / Western Mediterranean | 1995 | |
| Antithamnionella boergesenii | Italy / Central Mediterranean | 1991 - 1992 | |
| Antithamnionella boergesenii | Portugal / Azores | 2005 - 2007 | |
| Antithamnionella boergesenii | Portugal / Madeira | From 2001 | |
| Antithamnionella elegans | Greece / Central Mediterranean | 1975 | |
| Antithamnionella elegans | Greece / Eastern Mediterranean | 2007 | |
| Antithamnionella elegans | Italy / Adriatic Sea | 1980 - 1984 | |
| Antithamnionella elegans | Italy / Central Mediterranean | 1970 - 1971 | |
| Antithamnionella elegans | Italy / Western Mediterranean | 1822 | |
| Antithamnionella elegans var. sublittoralis | Italy / Central Mediterranean | 1980 | |
| Antithamnionella spirographidis | Australia / Bass strait | 1976 | |
| Antithamnionella spirographidis | Belgium | 1992 | |
| Antithamnionella spirographidis | France / Biscay Gulf | 1975 | |
| Antithamnionella spirographidis | France / Celtic seas | 1911 | |
| Antithamnionella spirographidis | France / English Channel | 1927 | |
| Antithamnionella spirographidis | France / Western Mediterranean | 2004 | |
| Antithamnionella spirographidis | Germany / North Sea | 2012 | |
| Antithamnionella spirographidis | Greece / Central Mediterranean | 1983 | |
| Antithamnionella spirographidis | Greece / Eastern Mediterranean | 1992 | |
| Antithamnionella spirographidis | Ireland | 1969 | |
| Antithamnionella spirographidis | Italy / Adriatic Sea | 1995 | |
| Antithamnionella spirographidis | Netherlands | 1974 | |
| Antithamnionella spirographidis | Portugal / Iberian Coastal | 2003 - 2008 | |
| Antithamnionella spirographidis | Portugal / Madeira | To 1974 | |
| Antithamnionella spirographidis | Spain / Iberian Coastal | 1927 | |
| Antithamnionella spirographidis | United Kingdom (Britain) / English Channel | To 1911 | |
| Antithamnionella ternifolia | Australia / Bass strait | 1977 | |
| Antithamnionella ternifolia | Belgium | 1970 | |
| Antithamnionella ternifolia | Denmark / Baltic Sea | 2014 | |
| Antithamnionella ternifolia | France / Biscay Gulf | 1969 | |
| Antithamnionella ternifolia | France / Celtic seas | 1910 | |
| Antithamnionella ternifolia | France / English Channel | 1910 | |
| Antithamnionella ternifolia | France / Western Mediterranean | 1981 | |
| Antithamnionella ternifolia | Germany / Baltic Sea | 2014 | |
| Antithamnionella ternifolia | Germany / North Sea | 1958 | |
| Antithamnionella ternifolia | Ireland | 1930 | |
| Antithamnionella ternifolia | Netherlands | 1951 | |
| Antithamnionella ternifolia | New Zealand / New Zealand Shelf / North Island | To 1972 | |
| Antithamnionella ternifolia | New Zealand / New Zealand Shelf / South Island | To 1904 | |
| Antithamnionella ternifolia | Portugal / Azores | 1987 | |
| Antithamnionella ternifolia | Portugal / Iberian Coastal | 1958 | |
| Antithamnionella ternifolia | Spain / Iberian Coastal | 1920 - 1929 | |
| Antithamnionella ternifolia | United Kingdom (Britain) / English Channel | To 1906 | |
| Antithamnionella ternifolia | United Kingdom (Britain) / North Sea | To 1999 | |
| Aoroides curvipes | France / Biscay Gulf | 2009 | |
| Aoroides longimerus | France / Biscay Gulf | 2013 | |
| Aoroides longimerus | France / Celtic seas | 2014 | |
| Aoroides longimerus | France / English Channel | 2014 | |
| Aoroides longimerus | France / Western Mediterranean | From 2015 | |
| Aoroides secundus | France / Biscay Gulf | To 2010 | |
| Aoroides semicurvatus | France / Biscay Gulf | 2009 | |
| Aoroides semicurvatus | France / English Channel | 2019 | |
| Aoroides semicurvatus | Netherlands | 2017 | |
| Apedinella radians | Bulgaria | 1987 | |
| Apedinella radians | Romania | 1991 | |
| Apedinella radians | Ukraine / Black Sea | From 1999 | |
| Aphanius dispar | Israel | 1944 | |
| Aphelochaeta marioni | Denmark / Baltic Sea | 1991 | |
| Aphelochaeta marioni | Denmark / North Sea | 1984 | |
| Aphelochaeta marioni | France / English Channel | 2001 | |
| Aphelochaeta marioni | Germany / North Sea | 1938 | |
| Aphelochaeta marioni | Netherlands | To 1951 | |
| Aphelochaeta marioni | United Kingdom (Britain) / North Sea / Orkney Islands | 1997 | |
| Aplidium accarense | Italy / Central Mediterranean | 2018 | |
| Aplidium accarense | Italy / Western Mediterranean | To 2015 | |
| Aplidium glabrum | Belgium | To 2018 | |
| Aplidium glabrum | Germany / North Sea | 1992 | |
| Aplidium glabrum | Ireland | 2010 | |
| Aplidium glabrum | Netherlands | To 1977 | |
| Aplidium glabrum | Portugal / Madeira | 2013 | |
| Aplidium pallidum | Italy / Western Mediterranean | 1913 | |
| Aplysia dactylomela | Greece / Central Mediterranean | 2005 | |
| Aplysia dactylomela | Greece / Eastern Mediterranean | 2005 | |
| Aplysia dactylomela | Portugal / Madeira | From 1987 | |
| Aplysilla rosea | Australia / Bass strait | 1981 | |
| Aplysiopsis formosa | Australia / Bass strait | 1994 | |
| Apoglossum gregarium | France / Western Mediterranean | To 1996 | |
| Apoglossum gregarium | Italy / Central Mediterranean | 1999 | |
| Apoglossum gregarium | Italy / Western Mediterranean | 1992 | |
| Apogonichthyoides pharaonis | Greece / Eastern Mediterranean | 1982 | |
| Apogonichthyoides pharaonis | Israel | 1947 | |
| Aporrhais pespelecani | Georgia | 1960 | |
| Aporrhais pespelecani | Turkey / Black Sea | 1896 | |
| Aporrhais pespelecani | Ukraine / Black Sea | From 1987 | |
| Apseudopsis tridens | Italy / Adriatic Sea | 2019 | |
| Aquilonastra burtoni | Israel | 1955 | |
| Arachnidium lacourti | Germany / Baltic Sea | To 2015 | |
| Arachnidium lacourti | Germany / North Sea | 2014 | |
| Arachnidium lacourti | Netherlands | To 2005 | |
| Arachnoidea protecta | Italy / Western Mediterranean | 1992 | |
| Arbopercula tenella | Israel | 2012 | |
| Arbopercula tenella | Italy / Central Mediterranean | 1990 | |
| Arbopercula tenella | Italy / Western Mediterranean | To 2011 | |
| Arcania brevifrons | Israel | 2016 | |
| Archesola typhlops | Ukraine / Black Sea | 2007 | |
| Arcuatula perfragilis | Israel | 1960 | |
| Arcuatula senhousia | Australia / Bass strait | 1980 - 1989 | |
| Arcuatula senhousia | France / Biscay Gulf | 1971 | |
| Arcuatula senhousia | France / Celtic seas | To 2008 | |
| Arcuatula senhousia | France / North Sea | 2018 | |
| Arcuatula senhousia | France / Western Mediterranean | 1982 | |
| Arcuatula senhousia | Israel | 1960 | |
| Arcuatula senhousia | Italy / Adriatic Sea | 1994 | |
| Arcuatula senhousia | Italy / Central Mediterranean | 2001 | |
| Arcuatula senhousia | Italy / Western Mediterranean | 1999 | |
| Arcuatula senhousia | Romania | 2002 | |
| Arcuatula senhousia | Spain / Iberian Coastal | To 2012 | |
| Argopecten irradians | China / Yellow Sea | 1982 | |
| Argopecten irradians | Korea, Democratic Peoples Republic of / Sea of Japan | To 2013 | |
| Argopecten irradians | Korea, Republic of / Sea of Japan | To 2013 | |
| Aricidea hartmani | Canada / Hudson Bay Complex | To 2010 | |
| Arietellus pavoninus | Greece / Eastern Mediterranean | 1967 | |
| Arnoglossus nigrofilamentosus | Israel | 2017 | |
| Artemia franciscana | France / Biscay Gulf | 1800 - 1899 | |
| Artemia franciscana | Italy / Adriatic Sea | 2004 | |
| Artemia franciscana | Portugal / Iberian Coastal | To 1980 | |
| Artemia franciscana | Portugal / Madeira | 1997 | |
| Artemia franciscana | Spain / Iberian Coastal | To 2002 | |
| Ascidia cannelata | Israel | 1955 | |
| Ascidia interrupta | Portugal / Azores | To 1992 | |
| Ascidiella aspersa | Australia / Bass strait | To 1985 | |
| Ascidiella aspersa | Canada / South-eastern Scotian Shelf | 2012 | |
| Ascidiella aspersa | Greece / Eastern Mediterranean | 1901 | |
| Ascidiella aspersa | Iceland | 2018 | |
| Ascidiella aspersa | Portugal / Madeira | 2015 | |
| Ascidiella aspersa | United Kingdom (Britain) / North Sea / Orkney Islands | 1994 | |
| Ascidiella scabra | Iceland | 2020 | |
| Ascidiella scabra | United Kingdom (Britain) / North Sea / Orkney Islands | 1994 | |
| Ascophyllum nodosum | Italy / Central Mediterranean | 2009 | |
| Ashtoret lunaris | Israel | 1987 | |
| Asparagopsis armata | France / Biscay Gulf | 1925 | |
| Asparagopsis armata | France / Celtic seas | 1922 | |
| Asparagopsis armata | France / English Channel | 1999 | |
| Asparagopsis armata | France / Western Mediterranean | 1926 | |
| Asparagopsis armata | Greece / Central Mediterranean | 2010 | |
| Asparagopsis armata | Greece / Eastern Mediterranean | 2010 | |
| Asparagopsis armata | Ireland | 1939 | |
| Asparagopsis armata | Italy / Adriatic Sea | To 1978 | |
| Asparagopsis armata | Italy / Central Mediterranean | To 1972 | |
| Asparagopsis armata | Italy / Western Mediterranean | To 1955 | |
| Asparagopsis armata | Netherlands | To 1983 | |
| Asparagopsis armata | Portugal / Azores | 1989 | |
| Asparagopsis armata | Portugal / Iberian Coastal | 1951 | |
| Asparagopsis armata | Portugal / Madeira | To 1974 | |
| Asparagopsis armata | Spain / Canary Islands | To 1980 | |
| Asparagopsis armata | Spain / Iberian Coastal | 1933 | |
| Asparagopsis armata | Turkey / Black Sea | 1973 | |
| Asparagopsis armata | United Kingdom (Britain) / Celtic seas / Channel Islands | 1949 | |
| Asparagopsis armata | United Kingdom (Britain) / English Channel | 1949 - 1950 | |
| Asparagopsis armata | United Kingdom (Britain) / North Sea | 1973 | |
| Asparagopsis armata | United Kingdom (Britain) / North Sea / Orkney Islands | From 1960 | |
| Asparagopsis taxiformis | France / Western Mediterranean | To 2006 | |
| Asparagopsis taxiformis | Portugal / Azores | 1929 | |
| Asparagopsis taxiformis | Portugal / Iberian Coastal | To 2000 | |
| Asparagopsis taxiformis | Portugal / Madeira | 1970 | |
| Asparagopsis taxiformis lineage 2 | Greece / Adriatic Sea | 2013 | |
| Asparagopsis taxiformis lineage 2 | Greece / Central Mediterranean | 2006 | |
| Asparagopsis taxiformis lineage 2 | Greece / Eastern Mediterranean | 1992 | |
| Asparagopsis taxiformis lineage 2 | Italy / Central Mediterranean | 1992 | |
| Asparagopsis taxiformis lineage 2 | Italy / Western Mediterranean | 1993 | |
| Asperococcus ensiformis | Australia / Bass strait | 1976 | |
| Asperococcus scaber | Netherlands | 1998 | |
| Aspidosiphon mexicanus | Greece / Central Mediterranean | 1994 | |
| Aspidosiphon mexicanus | Greece / Eastern Mediterranean | 1991 | |
| Asterias amurensis | Australia / Bass strait | 1995 | |
| Asterias rubens | Turkey / Black Sea | 2003 | |
| Asterionellopsis glacialis | Netherlands | To 2018 | |
| Asterionellopsis glacialis | Romania | 1968 | |
| Asterionellopsis glacialis | Russia / Black Sea | 1998 | |
| Asterionellopsis glacialis | Ukraine / Black Sea | From 1967 | |
| Asterocarpa humilis | France / Biscay Gulf | To 2013 | |
| Asterocarpa humilis | France / English Channel | 2005 | |
| Asterocarpa humilis | United Kingdom (Britain) / Celtic seas | 2013 | |
| Asterocarpa humilis | United Kingdom (Britain) / North Sea / Orkney Islands | 2014 | |
| Asteromphalus sarcophagus | France / Biscay Gulf | To 2003 | |
| Asteromphalus sarcophagus | France / Celtic seas | 2003 | |
| Asteromphalus sarcophagus | France / English Channel | 2001 | |
| Asthenognathus atlanticus | France / English Channel | 2008 | |
| Asthenognathus atlanticus | Netherlands | 2019 | |
| Atergatis roseus | Greece / Eastern Mediterranean | 2009 | |
| Atergatis roseus | Israel | 1961 | |
| Atherina boyeri | Netherlands | To 1964 | |
| Atherina boyeri | United Kingdom (Britain) / Celtic seas | 1956 | |
| Atherinomorus forskalii | Greece / Central Mediterranean | 2012 | |
| Atherinomorus forskalii | Greece / Eastern Mediterranean | 1986 | |
| Atherinomorus forskalii | Israel | 1924 | |
| Atrina rigida | United Kingdom (Britain) / English Channel | 1986 | |
| Attheya armata | United Kingdom (Britain) / Celtic seas | 2000 | |
| Attheya decora | Ukraine / Black Sea | 2000 | |
| Atyaephyra desmaresti | Belgium | To 1895 | |
| Atyaephyra desmaresti | Germany / North Sea | 1932 | |
| Atys angustatus | Israel | 1974 | |
| Aurelia aurita | Russia / Caspian Sea | 1999 | |
| Aurelia coerulea | France / Western Mediterranean | 2002 | |
| Aurelia coerulea | Italy / Adriatic Sea | 2011 | |
| Aurelia coerulea | Italy / Western Mediterranean | To 2016 | |
| Aurelia solida | France / Western Mediterranean | 2002 | |
| Aurelia solida | Italy / Adriatic Sea | 2005 - 2010 | |
| Aurelia solida | Italy / Central Mediterranean | 2013 | |
| Auriculinella bidentata | Germany / North Sea | 1997 | |
| Austrominius modestus | Belgium | 1950 | |
| Austrominius modestus | Denmark / North Sea | 1978 | |
| Austrominius modestus | France / Biscay Gulf | 1953 | |
| Austrominius modestus | France / Celtic seas | 1953 | |
| Austrominius modestus | France / English Channel | 1953 | |
| Austrominius modestus | France / North Sea | 1950 | |
| Austrominius modestus | France / Western Mediterranean | 1990 - 1999 | |
| Austrominius modestus | Germany / North Sea | 1953 | |
| Austrominius modestus | Ireland | 1957 | |
| Austrominius modestus | Netherlands | 1946 | |
| Austrominius modestus | Portugal / Iberian Coastal | From 1956 | |
| Austrominius modestus | Portugal / Madeira | To 2005 | |
| Austrominius modestus | Spain / Iberian Coastal | To 2006 | |
| Austrominius modestus | Sweden / North Sea | | |
| Austrominius modestus | United Kingdom (Britain) / English Channel | 1940 - 1945 | |
| Austrominius modestus | United Kingdom (Britain) / North Sea | From 1945 | |
| Austrominius modestus | United Kingdom (Britain) / North Sea / Orkney Islands | To 2017 | |
| Autonoe spiniventris | Spain / Iberian Coastal | To 2005 | |
| Axionice medusa | Greece / Central Mediterranean | 1980 | |
| Axionice medusa | Greece / Eastern Mediterranean | 1975 | |
| Axionice medusa | Italy / Central Mediterranean | 1985 | |
| Azadinium spinosum | Bulgaria | 2005 | |
| Azolla caroliniana | Ukraine / Black Sea | 1970 - 1979 | |
| Azolla filiculoides | Ireland | From 1907 | |
| Azolla filiculoides | Ukraine / Black Sea | 1970 - 1979 | |
| Babka gymnotrachelus | Poland | 2021 | |
| Bacteriastrum hyalinum | Bulgaria | 1907 | |
| Bacteriastrum hyalinum | Denmark / Baltic Sea | 1983 | |
| Bacteriastrum hyalinum | Denmark / North Sea | 1983 | |
| Bacteriastrum hyalinum | Romania | 1907 | |
| Bacteriastrum hyalinum | Ukraine / Black Sea | From 1907 | |
| Balanus amphitrite | Australia / Bass strait | To 1999 | |
| Balanus amphitrite | Belgium | 1952 | |
| Balanus amphitrite | France / Biscay Gulf | 1914 | |
| Balanus amphitrite | France / Celtic seas | 1914 | |
| Balanus amphitrite | Germany / North Sea | 2002 | |
| Balanus amphitrite | Ireland | To 1986 | |
| Balanus amphitrite | Netherlands | 1962 | |
| Balanus amphitrite | Portugal / Iberian Coastal | To 1854 | |
| Balanus amphitrite | Spain / Iberian Coastal | 1934 | |
| Balanus amphitrite | Sweden / North Sea | | |
| Balanus amphitrite | Ukraine / Black Sea | From 1905 | |
| Balanus amphitrite | United Kingdom (Britain) / English Channel | From 1937 | |
| Balanus glandula | Belgium | 2015 | |
| Balanus trigonus | Belgium | 1997 | |
| Balanus trigonus | France / Biscay Gulf | 2007 | |
| Balanus trigonus | France / Celtic seas | To 2007 | |
| Balanus trigonus | France / English Channel | 2007 | |
| Balanus trigonus | Greece / Eastern Mediterranean | 1970 | |
| Balanus trigonus | Italy / Adriatic Sea | 1964 | |
| Balanus trigonus | Italy / Central Mediterranean | To 1927 | |
| Balanus trigonus | Italy / Western Mediterranean | To 1962 | |
| Balanus trigonus | Portugal / Azores | To 1887 | |
| Balanus trigonus | Portugal / Iberian Coastal | To 2013 | |
| Balanus trigonus | Portugal / Madeira | To 1916 | |
| Balanus trigonus | Spain / Iberian Coastal | To 2007 | |
| Balanus trigonus | United Kingdom (Britain) / English Channel | 1986 | |
| Bangia atropurpurea | Australia / Bass strait | 1971 | |
| Bankia carinata | Greece / Eastern Mediterranean | 2008 - 2013 | |
| Bankia fimbriatula | Ireland | 1847 | |
| Barentsia benedeni | Germany / Baltic Sea | 2016 - 2021 | |
| Barentsia benedeni | Germany / North Sea | 2021 | |
| Barentsia benedeni | Russia / Caspian Sea | 1962 | |
| Barentsia matsushimana | Germany / North Sea | 2021 | |
| Barentsia ramosa | Netherlands | 2003 | |
| Beania maxilladentata | Portugal / Madeira | To 2013 | |
| Beania mirabilis | Spain / Canary Islands | To 2003 | |
| Bedeva paivae | Portugal / Madeira | To 1994 | |
| Bedeva paivae | Spain / Canary Islands | To 2003 | |
| Bellamya chinensis | Netherlands | 2009 | |
| Belzebub hanseni | Israel | 2008 | |
| Bemlos leptocheirus | Greece / Eastern Mediterranean | 2015 | |
| Bemlos leptocheirus | Israel | 2009 | |
| Beroe cucumis | Turkey / Black Sea | From 1992 | |
| Beroe ovata | Bulgaria | 1997 | |
| Beroe ovata | Denmark / Baltic Sea | 2011 | |
| Beroe ovata | Denmark / North Sea | 2013 | |
| Beroe ovata | Georgia | 1996 | |
| Beroe ovata | Greece / Eastern Mediterranean | 2004 | |
| Beroe ovata | Israel | 2011 | |
| Beroe ovata | Italy / Adriatic Sea | 2005 | |
| Beroe ovata | Romania | 1996 | |
| Beroe ovata | Russia / Black Sea | 1999 | |
| Beroe ovata | Sweden / North Sea | 2019 | |
| Beroe ovata | Turkey / Black Sea | 1996 | |
| Beroe ovata | Ukraine / Azov Sea | From 1997 | |
| Beroe ovata | Ukraine / Black Sea | From 1997 | |
| Berthellina citrina | Israel | 1956 | |
| Beryx splendens | France / Western Mediterranean | 1992 | |
| Biflustra grandicella | Netherlands | 2016 | |
| Bispira fabricii | France / English Channel | 2010 | |
| Bispira polyomma | Italy / Adriatic Sea | 2014 | |
| Bispira polyomma | Netherlands | To 2010 | |
| Biuve fulvipunctata | Israel | 1986 | |
| Biuve fulvipunctata | Italy / Central Mediterranean | 2015 | |
| Bivetiella cancellata | Spain / Iberian Coastal | 1999 | |
| Blackfordia virginica | Bulgaria | 1925 | |
| Blackfordia virginica | France / Biscay Gulf | 1953 | |
| Blackfordia virginica | France / Celtic seas | 1971 | |
| Blackfordia virginica | France / English Channel | 1973 | |
| Blackfordia virginica | Germany / Baltic Sea | 2014 | |
| Blackfordia virginica | Iran / Caspian Sea | From 1956 | |
| Blackfordia virginica | Netherlands | 2014 | |
| Blackfordia virginica | Portugal / Iberian Coastal | 1984 | |
| Blackfordia virginica | Romania | 1940 | |
| Blackfordia virginica | Russia / Azov Sea | 1930 | |
| Blackfordia virginica | Spain / Iberian Coastal | To 2008 | |
| Blackfordia virginica | Ukraine / Black Sea | 1960 - 1969 | |
| Boccardia polybranchia | France / Biscay Gulf | 1900 | |
| Boccardia polybranchia | France / Celtic seas | 2004 | |
| Boccardia polybranchia | France / English Channel | 1893 | |
| Boccardia polybranchia | France / North Sea | 1893 | |
| Boccardia proboscidea | Australia / Bass strait | 1978 | |
| Boccardia proboscidea | Belgium | To 2011 | |
| Boccardia proboscidea | France / Biscay Gulf | 2013 | |
| Boccardia proboscidea | France / English Channel | 1999 | |
| Boccardia proboscidea | France / North Sea | 2014 | |
| Boccardia proboscidea | Germany / North Sea | 2008 | |
| Boccardia proboscidea | Netherlands | 2013 | |
| Boccardia proboscidea | Spain / Iberian Coastal | 1996 | |
| Boccardia proboscidea | United Kingdom (Britain) / North Sea / Orkney Islands | 2014 | |
| Boccardia pseudonatrix | France / English Channel | 2018 | |
| Boccardia semibranchiata | France / Biscay Gulf | 1999 | |
| Boccardia semibranchiata | France / Celtic seas | 1999 | |
| Boccardia semibranchiata | France / English Channel | 1999 | |
| Boccardia semibranchiata | France / North Sea | 1999 | |
| Boccardia semibranchiata | Spain / Iberian Coastal | To 2003 | |
| Boccardiella hamata | Belgium | To 2018 | |
| Boccardiella hamata | France / English Channel | 2018 | |
| Boccardiella hamata | Germany / North Sea | 2021 | |
| Boccardiella hamata | Netherlands | To 2013 | |
| Boccardiella ligerica | Belgium | 1962 | |
| Boccardiella ligerica | Finland | 1960 - 1969 | |
| Boccardiella ligerica | France / English Channel | To 1960 | |
| Boccardiella ligerica | France / North Sea | To 1960 | |
| Boccardiella ligerica | Germany / Baltic Sea | 1932 | |
| Boccardiella ligerica | Germany / North Sea | To 2000 | |
| Boccardiella ligerica | Latvia | 2014 | |
| Boccardiella ligerica | Netherlands | To 1919 | |
| Boccardiella ligerica | Poland | 2017 | |
| Boccardiella ligerica | Sweden / Baltic Sea | 2013 | |
| Bolinopsis vitrea | Bulgaria | 2010 | |
| Bolinopsis vitrea | Turkey / Black Sea | 2007 | |
| Bonamia exitiosa | France / English Channel | 1981 | |
| Bonamia exitiosa | Spain / Iberian Coastal | 2007 | |
| Bonamia ostreae | Belgium | From 1979 | |
| Bonamia ostreae | Denmark / Baltic Sea | 2014 | |
| Bonamia ostreae | Denmark / North Sea | 2014 | |
| Bonamia ostreae | France / Biscay Gulf | 1979 | |
| Bonamia ostreae | France / Celtic seas | 1979 | |
| Bonamia ostreae | France / North Sea | 1981 | |
| Bonamia ostreae | France / Western Mediterranean | 1987 | |
| Bonamia ostreae | Ireland | To 1986 | |
| Bonamia ostreae | Netherlands | 1980 | |
| Bonamia ostreae | Spain / Iberian Coastal | 1982 | |
| Bonamia ostreae | United Kingdom (Britain) / Celtic seas / Channel Islands | From 1982 | |
| Bonamia ostreae | United Kingdom (Britain) / English Channel | 1982 | |
| Bonamia ostreae | United Kingdom (Britain) / North Sea | 1982 - 1983 | |
| Boninia neotethydis | Israel | 1998 | |
| Bonnemaisonia asparagoides | Turkey / Black Sea | 1990 - 1999 | |
| Bonnemaisonia hamifera | Belgium | To 1999 | |
| Bonnemaisonia hamifera | Denmark / Baltic Sea | 1900 | |
| Bonnemaisonia hamifera | Denmark / North Sea | 1900 | |
| Bonnemaisonia hamifera | Faroe Islands | 1980 | |
| Bonnemaisonia hamifera | France / Biscay Gulf | 1996 | |
| Bonnemaisonia hamifera | France / Celtic seas | 1898 | |
| Bonnemaisonia hamifera | France / English Channel | 1901 | |
| Bonnemaisonia hamifera | Germany / North Sea | 1890 - 1899 | |
| Bonnemaisonia hamifera | Iceland | 1978 | |
| Bonnemaisonia hamifera | Ireland | 1911 | |
| Bonnemaisonia hamifera | Italy / Adriatic Sea | 1995 | |
| Bonnemaisonia hamifera | Italy / Central Mediterranean | 1973 | |
| Bonnemaisonia hamifera | Netherlands | To 1983 | |
| Bonnemaisonia hamifera | Norway / Barents Sea | 1902 | |
| Bonnemaisonia hamifera | Norway / North Sea | 1902 | |
| Bonnemaisonia hamifera | Norway / Norwegian Sea | 1902 | |
| Bonnemaisonia hamifera | Portugal / Azores | 1989 | |
| Bonnemaisonia hamifera | Portugal / Iberian Coastal | 2003 - 2008 | |
| Bonnemaisonia hamifera | Spain / Canary Islands | To 1980 | |
| Bonnemaisonia hamifera | Spain / Iberian Coastal | To 2006 | |
| Bonnemaisonia hamifera | Sweden / North Sea | 1902 | |
| Bonnemaisonia hamifera | United Kingdom (Britain) / Celtic seas / Channel Islands | From 1890 | |
| Bonnemaisonia hamifera | United Kingdom (Britain) / English Channel | From 1890 | |
| Bonnemaisonia hamifera | United Kingdom (Britain) / North Sea | 1893 - 1986 | |
| Bonnemaisonia hamifera | United Kingdom (Britain) / North Sea / Orkney Islands | To 1960 | |
| Botrylloides anceps | Israel | 1991 | |
| Botrylloides diegensis | France / Biscay Gulf | 2007 | |
| Botrylloides diegensis | France / English Channel | 1999 | |
| Botrylloides diegensis | France / Western Mediterranean | 2012 | |
| Botrylloides diegensis | Italy / Adriatic Sea | 2015 | |
| Botrylloides giganteus | Italy / Central Mediterranean | 2003 | |
| Botrylloides leachii | Australia / Bass strait | 1901 | |
| Botrylloides leachii | Portugal / Madeira | 1993 | |
| Botrylloides leachii | Spain / Canary Islands | To 2003 | |
| Botrylloides leachii | United Kingdom (Britain) / North Sea / Orkney Islands | 1995 | |
| Botrylloides niger | Israel | 1952 | |
| Botrylloides niger | Portugal / Madeira | 2013 | |
| Botrylloides violaceus | Belgium | 2004 | |
| Botrylloides violaceus | Canada / Bay of Fundy | 2009 | |
| Botrylloides violaceus | Canada / Northern Gulf of St. Lawrence | 2014 | |
| Botrylloides violaceus | Canada / Northern Newfoundland | 2007 | |
| Botrylloides violaceus | Canada / South-eastern Scotian Shelf | 2001 | |
| Botrylloides violaceus | Canada / Southern Gulf of St. Lawrence and Eastern Scotian Shelf | 2004 | |
| Botrylloides violaceus | Canada / Southern Newfoundland and Southern Grand Banks | 2007 | |
| Botrylloides violaceus | France / Biscay Gulf | To 2000 | |
| Botrylloides violaceus | France / English Channel | 2000 | |
| Botrylloides violaceus | France / North Sea | 2004 | |
| Botrylloides violaceus | Germany / North Sea | 2011 | |
| Botrylloides violaceus | Iceland | 2018 | |
| Botrylloides violaceus | Ireland | 2005 | |
| Botrylloides violaceus | Italy / Adriatic Sea | 1993 | |
| Botrylloides violaceus | Netherlands | 2000 | |
| Botrylloides violaceus | Portugal / Iberian Coastal | From 2009 | |
| Botrylloides violaceus | Portugal / Madeira | 2007 | |
| Botrylloides violaceus | Spain / Iberian Coastal | To 2016 | |
| Botrylloides violaceus | United Kingdom (Britain) / Celtic seas / Channel Islands | From 2004 | |
| Botrylloides violaceus | United Kingdom (Britain) / English Channel | 2004 | |
| Botrylloides violaceus | United Kingdom (Britain) / North Sea / Orkney Islands | To 2012 | |
| Botryllus gaiae | Italy / Adriatic Sea | 2013 | |
| Botryllus gaiae | Italy / Central Mediterranean | 2013 | |
| Botryllus gaiae | Italy / Western Mediterranean | 2006 | |
| Botryllus schlosseri | Australia / Bass strait | 1977 | |
| Botryllus schlosseri | Canada / Bay of Fundy | 1970 - 1979 | |
| Botryllus schlosseri | Canada / Northern Gulf of St. Lawrence | 1975 | |
| Botryllus schlosseri | Canada / Northern Newfoundland | 2007 | |
| Botryllus schlosseri | Canada / South-eastern Scotian Shelf | 1950 - 1959 | |
| Botryllus schlosseri | Canada / Southern Gulf of St. Lawrence and Eastern Scotian Shelf | 2001 | |
| Botryllus schlosseri | Canada / Southern Newfoundland and Southern Grand Banks | 1940 - 1949 | |
| Botryllus schlosseri | Germany / Baltic Sea | To 2015 | |
| Botryllus schlosseri | Germany / North Sea | To 2016 | |
| Botryllus schlosseri | Greece / Eastern Mediterranean | 1955 | |
| Botryllus schlosseri | Iceland | 2011 | |
| Botryllus schlosseri | Italy / Adriatic Sea | To 2004 | |
| Botryllus schlosseri | Italy / Central Mediterranean | To 2011 | |
| Botryllus schlosseri | Italy / Western Mediterranean | To 2005 | |
| Botryllus schlosseri | Portugal / Azores | To 1971 | |
| Botryllus schlosseri | Portugal / Iberian Coastal | To 1970 | |
| Botryllus schlosseri | Portugal / Madeira | To 2006 | |
| Botryllus schlosseri | Spain / Canary Islands | To 2003 | |
| Botryllus schlosseri | United Kingdom (Britain) / North Sea / Orkney Islands | 1995 | |
| Botryocladia madagascariensis | Greece / Central Mediterranean | 2009 | |
| Botryocladia madagascariensis | Greece / Eastern Mediterranean | 2006 | |
| Botryocladia madagascariensis | Israel | 2014 | |
| Botryocladia madagascariensis | Italy / Adriatic Sea | 1997 | |
| Botryocladia madagascariensis | Italy / Central Mediterranean | 1991 | |
| Botryocladia wrightii | France / Biscay Gulf | 2010 | |
| Botryocladia wrightii | France / English Channel | 2019 | |
| Botryocladia wrightii | France / Western Mediterranean | 1978 | |
| Botrytella micromora | Australia / Bass strait | 1970 | |
| Botrytella parva | Italy / Adriatic Sea | 1996 | |
| Botrytella sp. | Netherlands | 1919 | |
| Bougainvillia macloviana | Germany / North Sea | 1895 | |
| Bougainvillia macloviana | Portugal / Azores | To 1989 | |
| Bougainvillia megas | Bulgaria | 1933 | |
| Bougainvillia megas | Iran / Caspian Sea | From 1956 | |
| Bougainvillia megas | Russia / Azov Sea | 1950 | |
| Bougainvillia megas | Ukraine / Black Sea | From 1960 | |
| Bougainvillia muscus | Australia / Bass strait | 1971 | |
| Bougainvillia rugosa | Sweden / North Sea | | |
| Brachidontes exustus | Ireland | 1977 | |
| Brachidontes exustus | United Kingdom (Britain) / Celtic seas | 1977 | |
| Brachidontes pharaonis | France / Western Mediterranean | 1989 | |
| Brachidontes pharaonis | Greece / Eastern Mediterranean | 1975 | |
| Brachidontes pharaonis | Israel | 1935 | |
| Brachidontes pharaonis | Italy / Central Mediterranean | 1969 | |
| Brachidontes pharaonis | Italy / Western Mediterranean | 1998 | |
| Brachynotus sexdentatus | France / Biscay Gulf | 1997 | |
| Brachynotus sexdentatus | France / English Channel | To 1963 | |
| Branchiodrilus hortensis | Belgium | To 2010 | |
| Branchiodrilus hortensis | Netherlands | To 2002 | |
| Branchiomma bairdi | Greece / Eastern Mediterranean | 2014 | |
| Branchiomma bairdi | Italy / Central Mediterranean | 2016 | |
| Branchiomma bairdi | Italy / Western Mediterranean | 2015 | |
| Branchiomma bairdi | Portugal / Madeira | 2013 | |
| Branchiomma bairdi | Spain / Canary Islands | 2012 | |
| Branchiomma boholense | Israel | 1927 | |
| Branchiomma boholense | Italy / Adriatic Sea | 2011 - 2012 | |
| Branchiomma boholense | Italy / Central Mediterranean | 2007 | |
| Branchiomma boholense | Italy / Western Mediterranean | 2004 | |
| Branchiomma bombyx | Netherlands | 1973 | |
| Branchiomma luctuosum | France / Western Mediterranean | 2022 | |
| Branchiomma luctuosum | Greece / Eastern Mediterranean | 1989 | |
| Branchiomma luctuosum | Italy / Central Mediterranean | 1998 - 1999 | |
| Branchiomma luctuosum | Italy / Western Mediterranean | 1978 - 1979 | |
| Branchiomma luctuosum | Spain / Spain | 2017 - 2018 | |
| Branchiura sowerbyi | Belgium | To 1931 | |
| Branchiura sowerbyi | Germany / Baltic Sea | To 1959 | |
| Branchiura sowerbyi | Germany / North Sea | 1961 | |
| Branchiura sowerbyi | Poland | 1976 | |
| Branchiura sowerbyi | Portugal / Azores | 2008 | |
| Brania arminii | Spain / Iberian Coastal | To 1998 | |
| Bregmaceros nectabanus | Greece / Central Mediterranean | 2016 | |
| Bregmaceros nectabanus | Greece / Eastern Mediterranean | 2014 | |
| Bregmaceros nectabanus | Israel | 2004 | |
| Bregmaceros nectabanus | Italy / Adriatic Sea | 2019 | |
| Bryopsis pennata | Israel | 1961 | |
| Bryopsis plumosa | Australia / Bass strait | 1966 | |
| Bugula avirostris | Spain / Canary Islands | To 2003 | |
| Bugula neritina | Australia / Bass strait | 1881 | |
| Bugula neritina | Belgium | 1999 | |
| Bugula neritina | France / Biscay Gulf | 2001 | |
| Bugula neritina | France / Celtic seas | 1966 | |
| Bugula neritina | France / English Channel | 2002 | |
| Bugula neritina | France / North Sea | 1973 | |
| Bugula neritina | France / Western Mediterranean | 1900 | |
| Bugula neritina | Germany / North Sea | 2010 | |
| Bugula neritina | Ireland | To 2006 | |
| Bugula neritina | Netherlands | 2007 | |
| Bugula neritina | Portugal / Azores | 2001 | |
| Bugula neritina | Portugal / Iberian Coastal | 2004 | |
| Bugula neritina | Portugal / Madeira | To 2012 | |
| Bugula neritina | Spain / Canary Islands | To 2003 | |
| Bugula neritina | Spain / Iberian Coastal | 2003 | |
| Bugula neritina | United Kingdom (Britain) / Celtic seas | To 1912 | |
| Bugula neritina | United Kingdom (Britain) / English Channel | To 1912 | |
| Bugulina calathus | Australia / Bass strait | 1978 | |
| Bugulina flabellata | Australia / Bass strait | 1982 | |
| Bugulina flabellata | New Zealand / New Zealand Shelf / North Island | To 1949 | |
| Bugulina flabellata | New Zealand / New Zealand Shelf / South Island | To 1949 | |
| Bugulina fulva | Greece / Eastern Mediterranean | 1996 | |
| Bugulina fulva | Ireland | 2012 | |
| Bugulina fulva | Portugal / Iberian Coastal | 1960 | |
| Bugulina fulva | Portugal / Madeira | 2013 | |
| Bugulina fulva | Spain / Canary Islands | To 2003 | |
| Bugulina fulva | United Kingdom (Britain) / North Sea / Orkney Islands | 2012 | |
| Bugulina simplex | Australia / Bass strait | 1982 | |
| Bugulina simplex | Belgium | 2000 | |
| Bugulina simplex | France / Biscay Gulf | 1994 | |
| Bugulina simplex | France / English Channel | 2002 | |
| Bugulina simplex | France / North Sea | 2000 | |
| Bugulina simplex | Ireland | 2011 | |
| Bugulina simplex | Netherlands | 2000 | |
| Bugulina simplex | Portugal / Azores | To 1998 | |
| Bugulina simplex | Portugal / Madeira | 2013 | |
| Bugulina simplex | United Kingdom (Britain) / Celtic seas | 1957 | |
| Bugulina simplex | United Kingdom (Britain) / North Sea / Orkney Islands | 2014 | |
| Bugulina stolonifera | Australia / Bass strait | 1880 - 1889 | |
| Bugulina stolonifera | Belgium | 1999 | |
| Bugulina stolonifera | France / Biscay Gulf | To 1994 | |
| Bugulina stolonifera | France / English Channel | 1970 | |
| Bugulina stolonifera | France / North Sea | 1970 | |
| Bugulina stolonifera | France / Western Mediterranean | 2002 | |
| Bugulina stolonifera | Germany / North Sea | To 1987 | |
| Bugulina stolonifera | Netherlands | 1993 | |
| Bugulina stolonifera | Portugal / Azores | To 1998 | |
| Bugulina stolonifera | Portugal / Iberian Coastal | 2004 | |
| Bugulina stolonifera | Portugal / Madeira | To 2010 | |
| Bugulina stolonifera | Spain / Canary Islands | To 2003 | |
| Bugulina stolonifera | United Kingdom (Britain) / Celtic seas | 1950 - 1959 | |
| Bugulina stolonifera | United Kingdom (Britain) / English Channel | 1950 - 1959 | |
| Bugulina stolonifera | United Kingdom (Britain) / North Sea | To 2005 | |
| Bulinus contortus | Spain / Iberian Coastal | 1999 | |
| Bulla arabica | Greece / Eastern Mediterranean | 1998 | |
| Bulla arabica | Israel | 1978 | |
| Bursatella leachii | Greece / Central Mediterranean | 2003 | |
| Bursatella leachii | Greece / Eastern Mediterranean | 1975 | |
| Bursatella leachii | Italy / Adriatic Sea | 1981 | |
| Bursatella leachii | Italy / Central Mediterranean | 1968 - 1973 | |
| Bursatella leachii | Italy / Western Mediterranean | 1975 - 1976 | |
| Bythocaris cosmetops | France / Biscay Gulf | 2002 | |
| Bythocaris cosmetops | France / Celtic seas | 2002 | |
| Calanopia elliptica | Greece / Eastern Mediterranean | 1988 | |
| Calanopia elliptica | Israel | 1963 | |
| Calanopia elliptica | Italy / Western Mediterranean | To 1892 | |
| Calanus euxinus | Russia / Caspian Sea | 2004 | |
| Calappa pelii | Greece / Central Mediterranean | 2005 | |
| Calappa pelii | Greece / Eastern Mediterranean | 2005 | |
| Caligus pageti | Ireland | 1986 | |
| Calliblepharis rammediorum | Israel | 2013 | |
| Callinectes danae | Italy / Adriatic Sea | 1981 | |
| Callinectes sapidus | Belgium | 1981 | |
| Callinectes sapidus | Bulgaria | 1967 | |
| Callinectes sapidus | Denmark / Baltic Sea | 1951 | |
| Callinectes sapidus | Denmark / North Sea | 1951 | |
| Callinectes sapidus | France / Biscay Gulf | 1901 | |
| Callinectes sapidus | France / Celtic seas | 1901 | |
| Callinectes sapidus | France / Western Mediterranean | To 1962 | |
| Callinectes sapidus | Georgia | 1975 | |
| Callinectes sapidus | Germany / Baltic Sea | 2023 | |
| Callinectes sapidus | Germany / North Sea | 1964 | |
| Callinectes sapidus | Greece / Adriatic Sea | 2013 | |
| Callinectes sapidus | Greece / Central Mediterranean | 1990 - 1999 | |
| Callinectes sapidus | Greece / Eastern Mediterranean | 1947 | |
| Callinectes sapidus | Israel | 1955 | |
| Callinectes sapidus | Italy / Adriatic Sea | 1949 | |
| Callinectes sapidus | Italy / Central Mediterranean | 1970 | |
| Callinectes sapidus | Italy / Western Mediterranean | 1962 | |
| Callinectes sapidus | Netherlands | 1932 | |
| Callinectes sapidus | Poland | 2018 | |
| Callinectes sapidus | Portugal / Iberian Coastal | 1978 | |
| Callinectes sapidus | Romania | 1998 | |
| Callinectes sapidus | Russia / Azov Sea | 1967 | |
| Callinectes sapidus | Russia / Black Sea | 1970 - 1979 | |
| Callinectes sapidus | Spain / Iberian Coastal | 2004 | |
| Callinectes sapidus | Turkey / Black Sea | From 1974 | |
| Callinectes sapidus | Ukraine / Azov Sea | 1970 - 1979 | |
| Callinectes sapidus | Ukraine / Black Sea | 1970 - 1979 | |
| Callinectes sapidus | United Kingdom (Britain) / North Sea | 1982 | |
| Callionymus filamentosus | Greece / Central Mediterranean | 2016 | |
| Callionymus filamentosus | Greece / Eastern Mediterranean | 2003 | |
| Callionymus filamentosus | Israel | 1953 | |
| Calliostoma zizyphinum | Netherlands | 2001 | |
| Callyspongia pergamentacea | Australia / Bass strait | 1895 | |
| Callyspongia siphonella | Spain / Iberian Coastal | To 2016 | |
| Calocalanus plumulosus | Romania | 1978 | |
| Caloria indica | Israel | 1986 | |
| Calyptospadix cerulea | Germany / North Sea | 2021 | |
| Calyptraea chinensis | France / English Channel | To 1977 | |
| Calyptraea chinensis | France / North Sea | To 1976 | |
| Calyptraea chinensis | Ireland | 1949 - 1956 | |
| Calyptraea chinensis | Netherlands | To 1942 | |
| Calyptraea chinensis | United Kingdom (Britain) / Celtic seas | 1957 | |
| Campanularia morgansi | Israel | 2009 | |
| Canarium mutabile | Israel | 1991 | |
| Cancer irroratus | Iceland | 2006 | |
| Cancer irroratus | Sweden / North Sea | 2019 | |
| Caprella equilibra | Australia / Bass strait | 1885 | |
| Caprella mutica | Belgium | 1998 | |
| Caprella mutica | Canada / Bay of Fundy | 2002 | |
| Caprella mutica | Canada / Northern Gulf of St. Lawrence | 2016 | |
| Caprella mutica | Canada / Northern Newfoundland | 2012 | |
| Caprella mutica | Canada / South-eastern Scotian Shelf | 2003 | |
| Caprella mutica | Canada / Southern Gulf of St. Lawrence and Eastern Scotian Shelf | 1998 | |
| Caprella mutica | Canada / Southern Newfoundland and Southern Grand Banks | 2010 | |
| Caprella mutica | Denmark / Baltic Sea | 2017 | |
| Caprella mutica | Denmark / North Sea | 2005 | |
| Caprella mutica | France / Biscay Gulf | 2004 | |
| Caprella mutica | France / North Sea | 2004 | |
| Caprella mutica | Germany / North Sea | 2004 | |
| Caprella mutica | Ireland | 2003 | |
| Caprella mutica | Netherlands | 1993 | |
| Caprella mutica | Norway / North Sea | 1999 | |
| Caprella mutica | Norway / Norwegian Sea | To 2012 | |
| Caprella mutica | Spain / Iberian Coastal | 2012 - 2013 | |
| Caprella mutica | Sweden / North Sea | 2011 | |
| Caprella mutica | United Kingdom (Britain) / Celtic seas | 2000 | |
| Caprella mutica | United Kingdom (Britain) / English Channel | 2000 | |
| Caprella mutica | United Kingdom (Britain) / North Sea | 2002 | |
| Caprella mutica | United Kingdom (Britain) / North Sea / Orkney Islands | To 2006 | |
| Caprella penantis | Australia / Bass strait | 1975 | |
| Caprella scaura | Australia / Bass strait | 1971 | |
| Caprella scaura | France / Western Mediterranean | 2014 | |
| Caprella scaura | Greece / Central Mediterranean | 2002 | |
| Caprella scaura | Greece / Eastern Mediterranean | 2012 | |
| Caprella scaura | Italy / Adriatic Sea | 1994 | |
| Caprella scaura | Italy / Central Mediterranean | 1989 - 1990 | |
| Caprella scaura | Italy / Western Mediterranean | 2003 - 2004 | |
| Caprella scaura | Netherlands | To 2016 | |
| Caprella scaura | Portugal / Azores | 2015 | |
| Caprella scaura | Portugal / Iberian Coastal | To 1985 | |
| Caprella scaura | Portugal / Madeira | To 2014 | |
| Caprella scaura | Spain / Canary Islands | 2009 | |
| Caprella scaura | Spain / Iberian Coastal | To 2011 | |
| Carassius auratus | Denmark / Baltic Sea | 1990 | |
| Carassius auratus | Denmark / North Sea | 2012 | |
| Carassius gibelio | Estonia | 1948 | |
| Carassius gibelio | Finland | 2001 - 2005 | |
| Carassius gibelio | Latvia | 1948 | |
| Carassius gibelio | Lithuania | 1601 - 1700 | |
| Carassius gibelio | Poland | 1930 - 1933 | |
| Carassius gibelio | Russia / Baltic Sea / St. Petersburg area | 2005 | |
| Carassius gibelio | Sweden / Baltic Sea | 1800 - 1997 | |
| Carbosphaerella leptosphaerioides | Ukraine / Black Sea | 1991 | |
| Carcinus maenas | Australia / Bass strait | 1802 - 1851 | |
| Carcinus maenas | Canada / Bay of Fundy | 1951 | |
| Carcinus maenas | Canada / Northern Gulf of St. Lawrence | 2008 | |
| Carcinus maenas | Canada / South-eastern Scotian Shelf | 1954 | |
| Carcinus maenas | Canada / Southern Gulf of St. Lawrence and Eastern Scotian Shelf | 1994 | |
| Carcinus maenas | Canada / Southern Newfoundland and Southern Grand Banks | 2007 | |
| Carpobrotus acinaciformis | Spain / Iberian Coastal | To 1900 | |
| Carupa tenuipes | Greece / Eastern Mediterranean | 2009 | |
| Carupa tenuipes | Israel | 2002 | |
| Cassiopea andromeda | Greece / Central Mediterranean | 2018 | |
| Cassiopea andromeda | Greece / Eastern Mediterranean | 1942 | |
| Cassiopea andromeda | Israel | 1988 | |
| Cassiopea andromeda | Italy / Western Mediterranean | 2014 | |
| Catostomus catostomus | Finland | 1980 - 1984 | |
| Catostomus catostomus | Russia / Baltic Sea / St. Petersburg area | 1980 - 1984 | |
| Caulacanthus okamurae | Italy / Adriatic Sea | 2018 - 2020 | |
| Caulacanthus okamurae | Italy / Central Mediterranean | 2018 | |
| Caulacanthus okamurae | Netherlands | 2018 | |
| Caulacanthus ustulatus | Belgium | To 2011 | |
| Caulacanthus ustulatus | France / Biscay Gulf | 2005 | |
| Caulacanthus ustulatus | France / Celtic seas | 1986 | |
| Caulacanthus ustulatus | France / English Channel | 1986 | |
| Caulacanthus ustulatus | Netherlands | To 2018 | |
| Caulacanthus ustulatus | Portugal / Azores | 1897 | |
| Caulacanthus ustulatus | United Kingdom (Britain) / English Channel | 2004 | |
| Caulerpa cylindracea | France / Western Mediterranean | 1997 | |
| Caulerpa cylindracea | Greece / Adriatic Sea | 2013 | |
| Caulerpa cylindracea | Greece / Central Mediterranean | 1993 | |
| Caulerpa cylindracea | Greece / Eastern Mediterranean | 1996 | |
| Caulerpa cylindracea | Italy / Adriatic Sea | 2000 | |
| Caulerpa cylindracea | Italy / Central Mediterranean | 1993 | |
| Caulerpa cylindracea | Italy / Western Mediterranean | 1994 | |
| Caulerpa cylindracea | Spain / Canary Islands | To 1989 | |
| Caulerpa denticulata | Israel | 1929 | |
| Caulerpa mexicana | Israel | 1939 | |
| Caulerpa racemosa var. lamourouxii f. requienii | Greece / Central Mediterranean | 2009 | |
| Caulerpa racemosa var. lamourouxii f. requienii | Greece / Eastern Mediterranean | 1956 | |
| Caulerpa racemosa var. lamourouxii f. requienii | Israel | 1951 | |
| Caulerpa taxifolia | France / Western Mediterranean | 1984 - 1987 | |
| Caulerpa taxifolia | Italy / Central Mediterranean | 1993 | |
| Caulerpa taxifolia | Italy / Western Mediterranean | 1992 | |
| Caulerpa taxifolia var. distichophylla | Greece / Eastern Mediterranean | 2010 | |
| Caulerpa taxifolia var. distichophylla | Israel | 2019 | |
| Caulerpa taxifolia var. distichophylla | Italy / Central Mediterranean | 2008 | |
| Caulerpa taxifolia var. distichophylla | Italy / Western Mediterranean | 2012 | |
| Caulerpa webbiana | Portugal / Azores | 2002 | |
| Caulerpa webbiana | Portugal / Madeira | From 1974 | |
| Caulibugula arcasounensis | France / Biscay Gulf | 2001 | |
| Caulibugula zanzibarensis | France / Biscay Gulf | To 2003 | |
| Cellana rota | Israel | 1961 | |
| Celleporaria albirostris | Australia / Bass strait | 1888 | |
| Celleporaria aperta | Israel | 1968 | |
| Celleporaria brunnea | France / Biscay Gulf | 2007 | |
| Celleporaria brunnea | France / Western Mediterranean | From 2015 | |
| Celleporaria brunnea | Greece / Eastern Mediterranean | 2015 | |
| Celleporaria brunnea | Italy / Central Mediterranean | 2010 - 2011 | |
| Celleporaria brunnea | Italy / Western Mediterranean | 2010 - 2011 | |
| Celleporaria brunnea | Portugal / Iberian Coastal | 2012 | |
| Celleporaria inaudita | Portugal / Madeira | 2014 | |
| Celleporaria vermiformis | Greece / Eastern Mediterranean | 2015 | |
| Celleporella carolinensis | Italy / Adriatic Sea | 1993 | |
| Celleporella hyalina | Australia / Bass strait | 1889 | |
| Celtodoryx ciocalyptoides | France / Biscay Gulf | 1990 - 1999 | |
| Celtodoryx ciocalyptoides | France / Celtic seas | 1996 | |
| Celtodoryx ciocalyptoides | France / North Sea | From 2014 | |
| Celtodoryx ciocalyptoides | Netherlands | To 2002 | |
| Centroceras clavulatum | Australia / Bass strait | 1971 | |
| Centroceras clavulatum | France / Biscay Gulf | 2014 | |
| Centroceras clavulatum | France / English Channel | 2017 | |
| Centropages furcatus | Greece / Eastern Mediterranean | 1988 | |
| Cephalothrix simula | Netherlands | To 2012 | |
| Cephalothrix simula | Spain / Iberian Coastal | To 2013 | |
| Ceramium botryocarpum | Netherlands | 2011 | |
| Ceramium cimbricum | Germany / North Sea | To 2010 | |
| Ceramium cimbricum | Netherlands | To 2009 | |
| Ceramium cingulatum | Portugal / Azores | 2005 - 2007 | |
| Ceramium circinatum | Germany / North Sea | 2015 | |
| Ceramium graecum | Greece / Eastern Mediterranean | 1990 | |
| Ceramium strobiliforme | Italy / Adriatic Sea | 1997 | |
| Ceramium strobiliforme | Italy / Western Mediterranean | 1991 | |
| Ceramium sungminbooi | Netherlands | To 2014 | |
| Ceramium tenuicorne | Netherlands | 2011 | |
| Ceramium virgatum | Australia / Bass strait | 1981 | |
| Cerastoderma edule | Iceland | 1948 | |
| Ceratonereis mirabilis | Israel | 1974 | |
| Cercopagis (Cercopagis) pengoi | Estonia | 1992 | |
| Cercopagis (Cercopagis) pengoi | Finland | 1992 | |
| Cercopagis (Cercopagis) pengoi | Germany / Baltic Sea | 2004 | |
| Cercopagis (Cercopagis) pengoi | Latvia | 1992 | |
| Cercopagis (Cercopagis) pengoi | Lithuania | 1999 | |
| Cercopagis (Cercopagis) pengoi | Poland | 1999 | |
| Cercopagis (Cercopagis) pengoi | Russia / Baltic Sea / Kaliningrad area | 1999 | |
| Cercopagis (Cercopagis) pengoi | Russia / Baltic Sea / St. Petersburg area | 1995 | |
| Cercopagis (Cercopagis) pengoi | Sweden / Baltic Sea | 1995 | |
| Cereus pedunculatus | Germany / North Sea | 1921 | |
| Cerithidium diplax | Israel | 1961 | |
| Cerithidium perparvulum | Greece / Eastern Mediterranean | 2010 | |
| Cerithidium perparvulum | Israel | 2004 | |
| Cerithiopsis pulvis | Greece / Eastern Mediterranean | 2010 | |
| Cerithiopsis pulvis | Israel | 1978 | |
| Cerithiopsis tenthrenois | Greece / Eastern Mediterranean | 1994 | |
| Cerithiopsis tenthrenois | Israel | 1982 | |
| Cerithium columna | Israel | 1966 | |
| Cerithium egenum | Israel | 1971 | |
| Cerithium nesioticum | Israel | 1971 | |
| Cerithium scabridum | Greece / Eastern Mediterranean | 2007 | |
| Cerithium scabridum | Israel | 1891 | |
| Cerithium scabridum | Italy / Adriatic Sea | 2005 - 2007 | |
| Cerithium scabridum | Italy / Central Mediterranean | 1976 | |
| Cerithium scabridum | Italy / Western Mediterranean | 1999 | |
| Chaetoceros aequatorialis | Bulgaria | 2011 | |
| Chaetoceros aequatorialis | Russia / Black Sea | 2004 | |
| Chaetoceros circinalis | Denmark / Baltic Sea | 2001 | |
| Chaetoceros circinalis | Denmark / North Sea | 2006 | |
| Chaetoceros concavicornis | Denmark / Baltic Sea | 2011 | |
| Chaetoceros concavicornis | Denmark / North Sea | 2011 | |
| Chaetoceros diversus var. papilionis | Georgia | 2000 | |
| Chaetoceros diversus var. papilionis | Ukraine / Black Sea | From 1999 | |
| Chaetoceros lorenzianus | Germany / Baltic Sea | 2009 | |
| Chaetoceros lorenzianus | Lithuania | 2005 | |
| Chaetoceros lorenzianus | Poland | 2003 | |
| Chaetoceros peruvianus | Denmark / Baltic Sea | 1981 | |
| Chaetoceros peruvianus | Denmark / North Sea | 1981 | |
| Chaetoceros peruvianus | France / Biscay Gulf | 1964 | |
| Chaetoceros peruvianus | France / Celtic seas | 2003 | |
| Chaetoceros peruvianus | France / English Channel | 1993 | |
| Chaetoceros peruvianus | Germany / Baltic Sea | To 2010 | |
| Chaetoceros peruvianus | Sweden / Baltic Sea | From 2007 | |
| Chaetoceros peruvianus | Sweden / North Sea | 2007 | |
| Chaetoceros rostratus | France / Celtic seas | 2003 | |
| Chaetoceros rostratus | France / English Channel | 2003 | |
| Chaetoceros throndsenii | Russia / Black Sea | 2005 | |
| Chaetoceros tortissimus | Russia / Black Sea | 2000 | |
| Chaetoceros tortissimus | Turkey / Black Sea | 1995 - 1996 | |
| Chaetoceros tortissimus | Ukraine / Black Sea | From 2001 | |
| Chaetodipterus faber | Greece / Eastern Mediterranean | 2019 | |
| Chaetodon auriga | Italy / Western Mediterranean | 2015 | |
| Chaetodon austriacus | Israel | 2011 | |
| Chaetodon larvatus | Israel | 2011 | |
| Chaetogammarus ischnus | Germany / Baltic Sea | To 2016 | |
| Chaetogammarus ischnus | Germany / North Sea | 1989 | |
| Chaetogammarus ischnus | Lithuania | 1960 | |
| Chaetogammarus ischnus | Netherlands | To 1991 | |
| Chaetogammarus ischnus | Poland | 1928 | |
| Chaetogammarus warpachowskyi | Latvia | 1966 | |
| Chaetogammarus warpachowskyi | Lithuania | 1960 | |
| Chaetogammarus warpachowskyi | Russia / Baltic Sea / Kaliningrad area | 1962 | |
| Chaetomorpha aerea | Australia / Bass strait | 1971 | |
| Chaetomorpha capillaris | Australia / Bass strait | 1983 | |
| Chaetomorpha linum | Australia / Bass strait | 1981 | |
| Chaetopleura angulata | Portugal / Iberian Coastal | To 1916 | |
| Chaetopleura angulata | Spain / Iberian Coastal | To 1850 | |
| Chaetozone corona | Greece / Central Mediterranean | 1982 | |
| Chaetozone corona | Greece / Eastern Mediterranean | 1989 | |
| Chaetozone corona | Italy / Adriatic Sea | 2006 | |
| Chaetozone corona | Italy / Central Mediterranean | 2018 | |
| Chaetozone corona | Italy / Western Mediterranean | 2014 - 2016 | |
| Chalinula loosanoffi | Germany / North Sea | To 1993 | |
| Chalinula loosanoffi | Netherlands | To 1880 | |
| Chalinula loosanoffi | United Kingdom (Britain) / English Channel | From 1970 | |
| Chalinula loosanoffi | United Kingdom (Britain) / North Sea | From 1970 | |
| Chama asperella | Greece / Eastern Mediterranean | 2007 | |
| Chama asperella | Israel | 2002 | |
| Chama gryphoides | Spain / Iberian Coastal | 2003 | |
| Chama pacifica | Greece / Eastern Mediterranean | 2005 | |
| Chama pacifica | Israel | 1988 | |
| Chama sp. | Ireland | 1989 | |
| Champsodon nudivittis | Greece / Eastern Mediterranean | 2012 | |
| Champsodon nudivittis | Israel | 2011 | |
| Chara connivens | Estonia | 1930 - 1959 | |
| Chara connivens | Finland | 2004 | |
| Chara connivens | Germany / Baltic Sea | 1858 | |
| Chara connivens | Latvia | 1920 - 1924 | |
| Chara connivens | Poland | 1900 - 1907 | |
| Chara connivens | Sweden / Baltic Sea | 1930 - 1950 | |
| Charybdis (Charybdis) feriata | Italy / Western Mediterranean | 2015 | |
| Charybdis (Charybdis) hellerii | Greece / Eastern Mediterranean | 2004 | |
| Charybdis (Charybdis) hellerii | Israel | 1925 | |
| Charybdis (Charybdis) japonica | Italy / Adriatic Sea | 2006 | |
| Charybdis (Charybdis) lucifera | Italy / Adriatic Sea | 2006 | |
| Charybdis (Goniohellenus) longicollis | Greece / Eastern Mediterranean | 1996 | |
| Charybdis (Goniohellenus) longicollis | Israel | 1961 | |
| Chattonella marina | Germany / North Sea | 1974 | |
| Chattonella marina | Netherlands | To 1991 | |
| Chattonella marina var. antiqua | Netherlands | To 1991 | |
| Cheilodipterus novemstriatus | Israel | 2010 | |
| Cheilopogon cyanopterus | France / Biscay Gulf | 2005 | |
| Chelicorophium curvispinum | Belgium | 1990 | |
| Chelicorophium curvispinum | Estonia | 2005 | |
| Chelicorophium curvispinum | France / Celtic seas | 1993 | |
| Chelicorophium curvispinum | France / English Channel | 2006 | |
| Chelicorophium curvispinum | France / North Sea | 2006 | |
| Chelicorophium curvispinum | Germany / Baltic Sea | 1932 | |
| Chelicorophium curvispinum | Germany / North Sea | 1912 | |
| Chelicorophium curvispinum | Ireland | To 2000 | |
| Chelicorophium curvispinum | Lithuania | 1921 - 1929 | |
| Chelicorophium curvispinum | Netherlands | 1987 | |
| Chelicorophium curvispinum | Poland | 1900 - 1928 | |
| Chelicorophium curvispinum | Russia / Baltic Sea / Kaliningrad area | 1921 - 1925 | |
| Chelicorophium curvispinum | Russia / Baltic Sea / St. Petersburg area | 2006 | |
| Chelicorophium robustum | Germany / North Sea | 2003 | |
| Chelicorophium robustum | Poland | 2018 | |
| Chelon haematocheilus | Turkey / Black Sea | From 1989 | |
| Chelon haematocheilus | Ukraine / Azov Sea | 1972 - 1996 | |
| Chelon haematocheilus | Ukraine / Black Sea | 1972 - 1996 | |
| Chelon labrosus | Ukraine / Black Sea | From 1983 | |
| Cherax destructor | Spain / Iberian Coastal | To 1983 | |
| Chionoecetes opilio | Norway / Barents Sea | To 2003 | |
| Chionoecetes opilio | Russia / Barents Sea | 1996 | |
| Chiton cumingsii | Spain / Canary Islands | To 2013 | |
| Chlorurus rhakoura | Italy / Central Mediterranean | 2017 | |
| Chondracanthus sp. | France / Biscay Gulf | 2009 | |
| Chondria arcuata | Australia / Bass strait | 1975 | |
| Chondria coerulescens | France / Western Mediterranean | 1993 | |
| Chondria coerulescens | Greece / Central Mediterranean | 1975 | |
| Chondria coerulescens | Greece / Eastern Mediterranean | 1982 | |
| Chondria coerulescens | Portugal / Azores | 2005 - 2007 | |
| Chondria collinsiana | Greece / Eastern Mediterranean | 1980 | |
| Chondria curvilineata | France / Western Mediterranean | 1981 | |
| Chondria curvilineata | Israel | 2013 | |
| Chondria curvilineata | Italy / Central Mediterranean | 2015 | |
| Chondria polyrhiza | Italy / Central Mediterranean | 1992 | |
| Chondria pygmaea | Italy / Adriatic Sea | 1998 | |
| Chondria pygmaea | Italy / Central Mediterranean | 1991 | |
| Chondria pygmaea | Italy / Western Mediterranean | 1995 | |
| Chondrus giganteus | France / Western Mediterranean | 1993 | |
| Chondrus giganteus f. flabellatus | France / Western Mediterranean | 1993 | |
| Chorda filum | France / Western Mediterranean | 1981 | |
| Chorizopora brongniartii | Iceland | 2015 | |
| Chorizopora brongniartii | Spain / Canary Islands | To 2003 | |
| Chromodoris quadricolor | France / Western Mediterranean | 2014 | |
| Chromodoris quadricolor | Italy / Western Mediterranean | 1982 | |
| Chrysaora hysoscella | Turkey / Black Sea | 2009 | |
| Chrysaora pseudoocellata | Israel | 2019 | |
| Chrysonephos lewisii | Italy / Western Mediterranean | 1992 | |
| Chrysymenia ventricosa | Turkey / Black Sea | 1990 - 1999 | |
| Chrysymenia wrightii | France / English Channel | 2013 | |
| Cinachyrella alloclada | Portugal / Azores | To 1989 | |
| Cingulina isseli | Israel | 1980 | |
| Ciona intestinalis | Australia / Bass strait | 1958 | |
| Ciona intestinalis | Canada / Bay of Fundy | 1850 - 1859 | |
| Ciona intestinalis | Canada / South-eastern Scotian Shelf | 1997 | |
| Ciona intestinalis | Canada / Southern Gulf of St. Lawrence and Eastern Scotian Shelf | 2004 | |
| Ciona intestinalis | Canada / Southern Newfoundland and Southern Grand Banks | 2012 | |
| Ciona intestinalis | France / English Channel | To 2012 | |
| Ciona intestinalis | Iceland | 2007 | |
| Ciona intestinalis | Portugal / Madeira | 1992 - 1993 | |
| Ciona robusta | France / Biscay Gulf | 1970 - 1979 | |
| Ciona robusta | Greece / Eastern Mediterranean | 1901 | |
| Ciona robusta | Iceland | 2019 | |
| Ciona robusta | Italy / Adriatic Sea | 2013 | |
| Circenita callipyga | Israel | 1972 | |
| Circulus octoliratus | Israel | 2018 | |
| Cirolana harfordi | Australia / Bass strait | 1996 | |
| Cirrenalia basiminuta | Ukraine / Black Sea | 2001 | |
| Cirrholovenia tetranema | Italy / Western Mediterranean | 1963 | |
| Cladophora flexuosa | Turkey / Black Sea | 1990 - 1999 | |
| Cladophora hutchinsiae | Bulgaria | 1938 | |
| Cladophora patentiramea | Israel | 2014 | |
| Cladophora prolifera | Australia / Bass strait | 1964 | |
| Cladophoropsis membranacea | Portugal / Azores | 1986 | |
| Cladosiphon zosterae | France / Western Mediterranean | 1993 | |
| Cladostephus spongiosus | Australia / Bass strait | 1966 | |
| Clausocalanus arcuicornis | Romania | 1978 | |
| Clausocalanus arcuicornis | Ukraine / Black Sea | From 2001 | |
| Clavelina dellavallei | Portugal / Madeira | To 1995 | |
| Clavelina lepadiformis | Portugal / Azores | To 1971 | |
| Clavelina lepadiformis | Portugal / Madeira | To 1995 | |
| Clavelina oblonga | France / Western Mediterranean | From 1986 | |
| Clavelina oblonga | Italy / Central Mediterranean | To 2008 | |
| Clavelina oblonga | Italy / Western Mediterranean | To 1929 | |
| Clavelina oblonga | Portugal / Azores | To 1971 | |
| Clavelina oblonga | Portugal / Madeira | 2013 | |
| Claviceps purpurea | Belgium | To 2008 | |
| Claviceps purpurea | Germany / North Sea | 2001 | |
| Claviceps purpurea | Netherlands | 1990 - 1999 | |
| Clementia papyracea | Greece / Eastern Mediterranean | 1985 | |
| Clementia papyracea | Israel | 1937 | |
| Clorida albolitura | Israel | 2006 | |
| Clymenella torquata | France / English Channel | 1977 | |
| Clymenella torquata | Ireland | 1974 - 1981 | |
| Clymenella torquata | United Kingdom (Britain) / North Sea | 1936 | |
| Clypeomorus bifasciatus | Israel | 1983 | |
| Clytia hemisphaerica | Australia / Bass strait | 1980 | |
| Clytia hummelincki | Italy / Adriatic Sea | 2001 | |
| Clytia hummelincki | Italy / Central Mediterranean | 1996 | |
| Clytia hummelincki | Italy / Western Mediterranean | 2003 | |
| Clytia linearis | France / Western Mediterranean | 1949 | |
| Clytia linearis | Greece / Central Mediterranean | 1977 | |
| Clytia linearis | Greece / Eastern Mediterranean | 1981 | |
| Clytia linearis | Italy / Adriatic Sea | To 1996 | |
| Clytia linearis | Italy / Central Mediterranean | 1991 | |
| Clytia linearis | Italy / Western Mediterranean | 1956 - 1959 | |
| Clytia mccradyi | Italy / Western Mediterranean | 1961 - 1963 | |
| Clytia paulensis | Australia / Bass strait | 1985 | |
| Cocconeis britannica | Ukraine / Black Sea | From 1902 | |
| Cochlodinium polykrikoides | Bulgaria | 2008 | |
| Cochlodinium polykrikoides | Russia / Black Sea | 2000 | |
| Cochlodinium polykrikoides | Ukraine / Black Sea | From 2001 | |
| Codium adhaerens | Spain / Iberian Coastal | To 2006 | |
| Codium arabicum | Israel | 2007 | |
| Codium arabicum | Portugal / Iberian Coastal | 2006 | |
| Codium fragile | Canada / Northern Newfoundland | 2013 | |
| Codium fragile | Canada / South-eastern Scotian Shelf | 1989 | |
| Codium fragile | Canada / Southern Gulf of St. Lawrence and Eastern Scotian Shelf | 1996 | |
| Codium fragile | Canada / Southern Newfoundland and Southern Grand Banks | 2012 | |
| Codium fragile | Norway / North Sea | 1946 | |
| Codium fragile | Spain / Canary Islands | To 2003 | |
| Codium fragile | Sweden / North Sea | 1932 | |
| Codium fragile atlanticum | Netherlands | To 1923 | |
| Codium fragile atlanticum | Norway / North Sea | 1895 | |
| Codium fragile atlanticum | Norway / Norwegian Sea | 1895 | |
| Codium fragile atlanticum | Portugal / Azores | To 1994 | |
| Codium fragile scandinavicum | Norway / North Sea | 1929 | |
| Codium fragile scandinavicum | Norway / Norwegian Sea | 1929 | |
| Codium fragile subsp. fragile | Australia / Bass strait | 1997 | |
| Codium fragile subsp. fragile | Belgium | 1939 | |
| Codium fragile subsp. fragile | Denmark / Baltic Sea | 1920 | |
| Codium fragile subsp. fragile | Denmark / North Sea | 1920 | |
| Codium fragile subsp. fragile | France / Biscay Gulf | 1946 | |
| Codium fragile subsp. fragile | France / Celtic seas | 1946 | |
| Codium fragile subsp. fragile | France / English Channel | 1940 | |
| Codium fragile subsp. fragile | France / North Sea | 1940 | |
| Codium fragile subsp. fragile | France / Western Mediterranean | 1946 | |
| Codium fragile subsp. fragile | Germany / North Sea | 1930 | |
| Codium fragile subsp. fragile | Greece / Central Mediterranean | 1985 | |
| Codium fragile subsp. fragile | Greece / Eastern Mediterranean | 1992 | |
| Codium fragile subsp. fragile | Iceland | 1974 | |
| Codium fragile subsp. fragile | Ireland | 1941 | |
| Codium fragile subsp. fragile | Italy / Adriatic Sea | 1978 | |
| Codium fragile subsp. fragile | Italy / Central Mediterranean | 1973 | |
| Codium fragile subsp. fragile | Italy / Western Mediterranean | 1978 - 1987 | |
| Codium fragile subsp. fragile | Netherlands | 1900 | |
| Codium fragile subsp. fragile | Norway / Barents Sea | 1946 | |
| Codium fragile subsp. fragile | Norway / North Sea | 1946 | |
| Codium fragile subsp. fragile | Norway / Norwegian Sea | 1946 | |
| Codium fragile subsp. fragile | Portugal / Azores | 1993 | |
| Codium fragile subsp. fragile | Portugal / Iberian Coastal | 2005 | |
| Codium fragile subsp. fragile | Spain / Canary Islands | To 2004 | |
| Codium fragile subsp. fragile | Spain / Iberian Coastal | To 1957 | |
| Codium fragile subsp. fragile | Turkey / Black Sea | From 1983 | |
| Codium fragile subsp. fragile | United Kingdom (Britain) / Celtic seas | 1891 | |
| Codium fragile subsp. fragile | United Kingdom (Britain) / English Channel | 1891 | |
| Codium fragile subsp. fragile | United Kingdom (Britain) / North Sea / Orkney Islands | From 1960 | |
| Codium parvulum | Israel | 2004 | |
| Codium pulvinatum | Israel | 2014 | |
| Codium taylorii | Israel | 1939 | |
| Codium vermilara | Portugal / Azores | To 1995 | |
| Colaconema codicola | France / Western Mediterranean | 1950 | |
| Colaconema codicola | Italy / Adriatic Sea | 1978 | |
| Colaconema codicola | Italy / Western Mediterranean | To 1984 | |
| Colaconema codicola | Turkey / Black Sea | 1994 | |
| Colaconema dasyae | Netherlands | 1951 | |
| Colaconema garbaryi | Australia / Bass strait | 1977 | |
| Coleusia signata | Greece / Eastern Mediterranean | 2005 | |
| Coleusia signata | Israel | 1953 | |
| Colpomenia peregrina | Australia / Bass strait | 1971 | |
| Colpomenia peregrina | Denmark / Baltic Sea | 1939 | |
| Colpomenia peregrina | Denmark / North Sea | 1939 | |
| Colpomenia peregrina | France / Biscay Gulf | 1905 | |
| Colpomenia peregrina | France / Celtic seas | 1905 | |
| Colpomenia peregrina | France / English Channel | 1905 | |
| Colpomenia peregrina | France / North Sea | 1971 | |
| Colpomenia peregrina | France / Western Mediterranean | 1918 - 1957 | |
| Colpomenia peregrina | Germany / North Sea | 2017 | |
| Colpomenia peregrina | Greece / Central Mediterranean | 2001 | |
| Colpomenia peregrina | Greece / Eastern Mediterranean | 1986 | |
| Colpomenia peregrina | Ireland | To 1935 | |
| Colpomenia peregrina | Italy / Central Mediterranean | To 1975 | |
| Colpomenia peregrina | Italy / Western Mediterranean | 1964 | |
| Colpomenia peregrina | Netherlands | 1921 | |
| Colpomenia peregrina | Norway / North Sea | 1933 | |
| Colpomenia peregrina | Norway / Norwegian Sea | 1933 | |
| Colpomenia peregrina | Portugal / Azores | To 1994 | |
| Colpomenia peregrina | Portugal / Iberian Coastal | 1951 | |
| Colpomenia peregrina | Spain / Canary Islands | To 1978 | |
| Colpomenia peregrina | Spain / Iberian Coastal | To 1960 | |
| Colpomenia peregrina | Sweden / North Sea | 1950 | |
| Colpomenia peregrina | United Kingdom (Britain) / Celtic seas | 1907 | |
| Colpomenia peregrina | United Kingdom (Britain) / English Channel | 1907 | |
| Colpomenia peregrina | United Kingdom (Britain) / North Sea | 1908 - 1930 | |
| Colpomenia peregrina | United Kingdom (Britain) / North Sea / Orkney Islands | To 1960 | |
| Colpomenia sinuosa | Australia / Bass strait | 1966 | |
| Colpomenia sinuosa | Portugal / Madeira | 1870 | |
| Conchoderma auritum | Belgium | To 2010 | |
| Conchoderma auritum | Netherlands | 1976 | |
| Congeria leucophaeta leucophaeta | Germany / Baltic Sea | To 2013 | |
| Congeria leucophaeta leucophaeta | Germany / North Sea | 1930 | |
| Conomurex persicus | Greece / Central Mediterranean | 2001 | |
| Conomurex persicus | Greece / Eastern Mediterranean | 1983 | |
| Conomurex persicus | Israel | 1983 | |
| Conopeum reticulum | Australia / Bass strait | 1879 | |
| Conopeum seurati | Russia / Caspian Sea | 1958 | |
| Conopeum seurati | United Kingdom (Britain) / North Sea / Orkney Islands | 1994 | |
| Conradia eutornisca | Israel | 1989 | |
| Conus arenatus arenatus | Israel | 1937 | |
| Conus fumigatus | Israel | 2016 | |
| Coolia monotis | Greece / Eastern Mediterranean | 2002 | |
| Corambe obscura | Bulgaria | 1986 | |
| Corambe obscura | France / Biscay Gulf | 1973 | |
| Corambe obscura | France / Celtic seas | 1973 | |
| Corambe obscura | Germany / North Sea | 2019 | |
| Corambe obscura | Netherlands | 1879 | |
| Corambe obscura | Romania | 1990 | |
| Corambe obscura | Russia / Azov Sea | 1986 | |
| Corambe obscura | Ukraine / Azov Sea | From 1989 | |
| Corambe obscura | Ukraine / Black Sea | From 1989 | |
| Corbicula fluminalis | Belgium | To 1992 | |
| Corbicula fluminalis | Germany / North Sea | To 1983 | |
| Corbicula fluminalis | Netherlands | To 1990 | |
| Corbicula fluminalis | Portugal / Iberian Coastal | 1980 - 1989 | |
| Corbicula fluminalis | Ukraine / Black Sea | 2000 - 2003 | |
| Corbicula fluminea | Belgium | To 1992 | |
| Corbicula fluminea | Germany / North Sea | 1983 | |
| Corbicula fluminea | Ireland | To 2010 | |
| Corbicula fluminea | Netherlands | To 1998 | |
| Corbicula fluminea | Portugal / Iberian Coastal | To 1978 | |
| Corbicula fluminea | Spain / Iberian Coastal | 1994 | |
| Corbicula fluminea | Ukraine / Black Sea | 1995 - 2000 | |
| Corbicula fluminea | United Kingdom (Britain) / North Sea | 1998 | |
| Cordylophora caspia | Belgium | 1905 | |
| Cordylophora caspia | Denmark / Baltic Sea | 1891 - 1899 | |
| Cordylophora caspia | Denmark / North Sea | 1895 | |
| Cordylophora caspia | Estonia | 1801 - 1850 | |
| Cordylophora caspia | Finland | 1801 - 1889 | |
| Cordylophora caspia | France / Biscay Gulf | 1901 | |
| Cordylophora caspia | France / Celtic seas | 1901 | |
| Cordylophora caspia | France / English Channel | To 1901 | |
| Cordylophora caspia | Germany / Baltic Sea | 1858 | |
| Cordylophora caspia | Germany / North Sea | 1858 | |
| Cordylophora caspia | Ireland | To 1844 | |
| Cordylophora caspia | Italy / Adriatic Sea | 1978 | |
| Cordylophora caspia | Italy / Central Mediterranean | 1978 | |
| Cordylophora caspia | Italy / Western Mediterranean | 1978 | |
| Cordylophora caspia | Latvia | 1801 - 1899 | |
| Cordylophora caspia | Lithuania | 1801 - 1899 | |
| Cordylophora caspia | Netherlands | 1884 | |
| Cordylophora caspia | Norway / North Sea | 1985 | |
| Cordylophora caspia | Poland | 1801 - 1850 | |
| Cordylophora caspia | Portugal / Iberian Coastal | To 1983 | |
| Cordylophora caspia | Russia / Baltic Sea / Kaliningrad area | 1860 - 1870 | |
| Cordylophora caspia | Russia / Baltic Sea / St. Petersburg area | 1979 | |
| Cordylophora caspia | Sweden / Baltic Sea | 1810 | |
| Cordylophora caspia | Sweden / North Sea | 1895 - 1971 | |
| Cordylophora caspia | Ukraine / Black Sea | 1950 - 1959 | |
| Cordylophora caspia | United Kingdom (Britain) / Celtic seas | | |
| Cordylophora caspia | United Kingdom (Britain) / English Channel | | |
| Cordylophora caspia | United Kingdom (Britain) / North Sea | | |
| Coregonus autumnalis | Latvia | 1957 | |
| Coregonus autumnalis | Russia / Baltic Sea / St. Petersburg area | 1953 - 1957 | |
| Coregonus muksun | Latvia | 1970 | |
| Coregonus muksun | Poland | 1984 | |
| Coregonus nasus | Latvia | 1960 | |
| Coregonus peled | Estonia | 1959 | |
| Coregonus peled | Finland | 1965 | |
| Coregonus peled | Latvia | 1954 | |
| Coregonus peled | Lithuania | 1960 | |
| Coregonus peled | Poland | 1966 | |
| Coregonus peled | Russia / Baltic Sea / Kaliningrad area | 1958 | |
| Coregonus peled | Russia / Baltic Sea / St. Petersburg area | 1955 - 1956 | |
| Corella eumyota | France / Biscay Gulf | To 2002 | |
| Corella eumyota | France / Celtic seas | To 2006 | |
| Corella eumyota | France / English Channel | 2002 | |
| Corella eumyota | France / North Sea | 2007 | |
| Corella eumyota | Germany / North Sea | 2016 | |
| Corella eumyota | Ireland | 2005 | |
| Corella eumyota | Netherlands | 2007 | |
| Corella eumyota | Portugal / Iberian Coastal | 2008 | |
| Corella eumyota | Spain / Iberian Coastal | To 2008 | |
| Corella eumyota | United Kingdom (Britain) / Celtic seas | 2004 | |
| Corella eumyota | United Kingdom (Britain) / English Channel | 2004 | |
| Corella eumyota | United Kingdom (Britain) / North Sea | 2009 - 2013 | |
| Corella eumyota | United Kingdom (Britain) / North Sea / Orkney Islands | To 2012 | |
| Corethron pennatum | Netherlands | To 2018 | |
| Coriophora lessepsiana | Israel | 2018 | |
| Cornigerius maeoticus | Russia / Baltic Sea / St. Petersburg area | 2003 | |
| Corollospora lacera | Ukraine / Black Sea | 1992 | |
| Corophium volutator | Russia / Caspian Sea | 1950 - 1959 | |
| Corymbellus aureus | Denmark / Baltic Sea | 1992 | |
| Corymbellus aureus | Denmark / North Sea | 1989 | |
| Coryne eximia | Australia / Bass strait | 1884 | |
| Corynomorpha prismatica | Portugal / Azores | 1990 | |
| Corynophlaea verruculiformis | Netherlands | 1994 | |
| Coryphellina rubrolineata | Greece / Eastern Mediterranean | 2009 | |
| Coryphellina rubrolineata | Israel | 1988 | |
| Coscinasterias tenuispina | Spain / Iberian Coastal | 2000 | |
| Coscinodiscus wailesii | Belgium | 1977 - 1978 | |
| Coscinodiscus wailesii | Denmark / Baltic Sea | 1983 - 1989 | |
| Coscinodiscus wailesii | Denmark / North Sea | 1983 | |
| Coscinodiscus wailesii | France / Biscay Gulf | 1972 - 1978 | |
| Coscinodiscus wailesii | France / Celtic seas | 1978 | |
| Coscinodiscus wailesii | France / English Channel | 1978 | |
| Coscinodiscus wailesii | Germany / North Sea | 1977 | |
| Coscinodiscus wailesii | Ireland | 1979 | |
| Coscinodiscus wailesii | Netherlands | 1978 | |
| Coscinodiscus wailesii | Norway / North Sea | 1979 | |
| Coscinodiscus wailesii | Sweden / Baltic Sea | 1995 - 2005 | |
| Coscinodiscus wailesii | Sweden / North Sea | To 1995 | |
| Coscinodiscus wailesii | United Kingdom (Britain) / Celtic seas | 1977 | |
| Coscinodiscus wailesii | United Kingdom (Britain) / English Channel | 1977 | |
| Cossura coasta | Greece / Central Mediterranean | 1980 | |
| Cossura coasta | Greece / Eastern Mediterranean | 1975 | |
| Costellipitar chordatus | Israel | 2012 | |
| Cotula coronopifolia | Germany / North Sea | 1739 | |
| Cotula coronopifolia | Netherlands | 1846 | |
| Cotylorhiza erythraea | Israel | 2003 | |
| Cradoscrupocellaria bertholletii | Australia / Bass strait | From 1900 | |
| Cradoscrupocellaria bertholletii | Portugal / Madeira | 2006 | |
| Crambe crambe | Portugal / Madeira | To 2004 | |
| Crangon crangon | Iceland | 2003 | |
| Crangonyx pseudogracilis | Ireland | 1975 - 1993 | |
| Craspedacusta sowerbii | Germany / North Sea | 1960 - 1969 | |
| Craspedacusta sowerbii | Ireland | To 2013 | |
| Crassicorophium bonellii | United Kingdom (Britain) / North Sea / Orkney Islands | 1995 | |
| Crassicorophium crassicorne | United Kingdom (Britain) / North Sea / Orkney Islands | 1995 | |
| Crassimarginatella papulifera | Spain / Iberian Coastal | To 2016 | |
| Crassostrea rhizophorae | France / Celtic seas | 1976 | |
| Crassostrea rhizophorae | United Kingdom (Britain) / Celtic seas | 1981 | |
| Crassostrea rivularis | France / Celtic seas | 1994 | |
| Crassostrea sikamea | France / Celtic seas | 1994 | |
| Crassostrea virginica | Belgium | 1960 - 1969 | |
| Crassostrea virginica | Denmark / Baltic Sea | 1880 | |
| Crassostrea virginica | France / Biscay Gulf | 1861 | |
| Crassostrea virginica | France / Celtic seas | 1861 | |
| Crassostrea virginica | Germany / Baltic Sea | 1886 - 1896 | |
| Crassostrea virginica | Germany / North Sea | 1911 | |
| Crassostrea virginica | Ireland | 1870 | |
| Crassostrea virginica | Netherlands | To 1943 | |
| Crassostrea virginica | Romania | 1973 | |
| Crassostrea virginica | Sweden / North Sea | | |
| Crassostrea virginica | United Kingdom (Britain) / North Sea | 1872 | |
| Crenidens crenidens | Israel | 1992 | |
| Crepidacantha poissonii | Greece / Eastern Mediterranean | 1986 | |
| Crepidacantha poissonii | Italy / Central Mediterranean | 1982 | |
| Crepidula fornicata | Belgium | 1911 | |
| Crepidula fornicata | Denmark / Baltic Sea | 1934 | |
| Crepidula fornicata | Denmark / North Sea | 1934 | |
| Crepidula fornicata | France / Biscay Gulf | 1934 | |
| Crepidula fornicata | France / Celtic seas | 1949 | |
| Crepidula fornicata | France / English Channel | 1934 | |
| Crepidula fornicata | France / North Sea | 1962 | |
| Crepidula fornicata | France / Western Mediterranean | 1957 | |
| Crepidula fornicata | Germany / North Sea | 1934 | |
| Crepidula fornicata | Greece / Eastern Mediterranean | 1985 | |
| Crepidula fornicata | Ireland | 1893 | |
| Crepidula fornicata | Italy / Central Mediterranean | 1973 | |
| Crepidula fornicata | Italy / Western Mediterranean | 1983 | |
| Crepidula fornicata | Netherlands | 1929 | |
| Crepidula fornicata | Norway / Barents Sea | To 1985 | |
| Crepidula fornicata | Norway / North Sea | 1958 - 1985 | |
| Crepidula fornicata | Norway / Norwegian Sea | To 1985 | |
| Crepidula fornicata | Portugal / Iberian Coastal | To 1999 | |
| Crepidula fornicata | Spain / Iberian Coastal | To 1983 | |
| Crepidula fornicata | Sweden / North Sea | 1950 | |
| Crepidula fornicata | United Kingdom (Britain) / Celtic seas | 1872 | |
| Crepidula fornicata | United Kingdom (Britain) / English Channel | 1872 | |
| Crepidula fornicata | United Kingdom (Britain) / North Sea | 1887 - 1890 | |
| Crepipatella dilatata | Spain / Iberian Coastal | 2005 | |
| Cristapseudes omercooperi | Israel | 2005 | |
| Crisularia serrata | France / Western Mediterranean | 1902 | |
| Crisularia serrata | Greece / Eastern Mediterranean | 1967 | |
| Crisularia serrata | Italy / Western Mediterranean | 1986 - 1987 | |
| Critomolgus actiniae | Ireland | 1973 | |
| Cryptocentrus caeruleopunctatus | Israel | 2014 | |
| Cryptonemia hibernica | France / English Channel | 1980 | |
| Cryptonemia hibernica | Ireland | 1971 | |
| Cryptonemia hibernica | United Kingdom (Britain) / English Channel | 2000 | |
| Cryptonemia lomation | United Kingdom (Britain) / Celtic seas | 1983 | |
| Cryptorchestia cavimana | Belgium | To 2002 | |
| Cryptorchestia cavimana | Germany / Baltic Sea | To 1925 | |
| Cryptorchestia cavimana | Germany / North Sea | To 1920 | |
| Cryptorchestia cavimana | Netherlands | 1878 | |
| Cryptorchestia cavimana | Poland | To 1925 | |
| Cryptosula pallasiana | Australia / Bass strait | 1886 - 1889 | |
| Cryptosula pallasiana | New Zealand / New Zealand Shelf / North Island | To 1890 | |
| Cryptosula pallasiana | New Zealand / New Zealand Shelf / South Island | To 1890 | |
| Cryptosula pallasiana | Portugal / Madeira | 2014 | |
| Ctenodrilus serratus | Portugal / Madeira | 1992 | |
| Ctenodrilus serratus | United Kingdom (Britain) / North Sea / Orkney Islands | 2015 | |
| Ctenopharyngodon idella | Denmark / Baltic Sea | 2008 | |
| Ctenopharyngodon idella | Finland | 1970 - 1979 | |
| Cucurbitula cymbium | Israel | 1954 | |
| Cumulospora marina | Ukraine / Black Sea | From 2001 | |
| Cumulospora varia | Ukraine / Black Sea | 2001 | |
| Cuthona perca | Italy / Adriatic Sea | 1976 - 1977 | |
| Cuthona perca | Ukraine / Black Sea | 2007 | |
| Cutleria multifida | Australia / Bass strait | 1966 | |
| Cutleria multifida | Greece / Central Mediterranean | 1975 | |
| Cutleria multifida | Greece / Eastern Mediterranean | 1932 | |
| Cutleria multifida | Italy / Western Mediterranean | 2012 | |
| Cyclichthys spilostylus | Israel | 1992 | |
| Cycloscala hyalina | Israel | 2018 | |
| Cylichna villersii | Israel | 2008 | |
| Cymbaloporetta plana | Greece / Eastern Mediterranean | 2001 - 2006 | |
| Cymodoce fuscina | Greece / Eastern Mediterranean | 2015 | |
| Cymodocea nodosa | Turkey / Black Sea | 2000 - 2009 | |
| Cynoglossus sinusarabici | Israel | 1953 | |
| Cynoscion nebulosus | Spain / Iberian Coastal | To 2013 | |
| Cynoscion regalis | France / Biscay Gulf | 2021 | |
| Cynoscion regalis | Portugal / Iberian Coastal | To 2016 | |
| Cyprinus carpio | Denmark / Baltic Sea | 1879 | |
| Cyprinus carpio | Denmark / North Sea | 1879 | |
| Cyprinus carpio | Estonia | 1893 | |
| Cyprinus carpio | Finland | 1958 | |
| Cyprinus carpio | Latvia | 1201 - 1300 | |
| Cyprinus carpio | Lithuania | 1501 - 1600 | |
| Cyprinus carpio | Poland | 1200 - 1300 | |
| Cyprinus carpio | Russia / Baltic Sea / Kaliningrad area | 1501 - 1599 | |
| Cyprinus carpio | Russia / Baltic Sea / St. Petersburg area | 1893 - 1899 | |
| Cyprinus carpio | Sweden / Baltic Sea | 1952 | |
| Cystodytes dellechiajei | Portugal / Azores | To 1969 | |
| Cystodytes dellechiajei | Portugal / Madeira | To 1995 | |
| Darcythompsonia fairliensis | Ukraine / Black Sea | 2009 | |
| Darwinella australiensis | Australia / Bass strait | 1885 | |
| Darwinella gardineri | Australia / Bass strait | 1981 | |
| Dasya baillouviana | Denmark / Baltic Sea | 1961 | |
| Dasya baillouviana | Denmark / North Sea | 1961 | |
| Dasya baillouviana | Germany / Baltic Sea | 1961 | |
| Dasya baillouviana | Germany / North Sea | 1960 - 1969 | |
| Dasya baillouviana | Netherlands | 1950 | |
| Dasya baillouviana | Norway / North Sea | 1966 | |
| Dasya baillouviana | Portugal / Azores | 1997 | |
| Dasya baillouviana | Sweden / North Sea | 1940 - 1952 | |
| Dasya sessilis | France / Biscay Gulf | 2005 | |
| Dasya sessilis | France / Western Mediterranean | 1984 | |
| Dasya sessilis | Netherlands | 2003 | |
| Dasya sessilis | Portugal / Iberian Coastal | From 1989 | |
| Dasya sessilis | Spain / Iberian Coastal | 1989 | |
| Dasysiphonia japonica | Belgium | 2015 | |
| Dasysiphonia japonica | Denmark / Baltic Sea | 2005 | |
| Dasysiphonia japonica | Denmark / North Sea | 2005 | |
| Dasysiphonia japonica | France / Celtic seas | 1994 | |
| Dasysiphonia japonica | France / English Channel | 1984 | |
| Dasysiphonia japonica | France / North Sea | 1984 | |
| Dasysiphonia japonica | France / Western Mediterranean | 1994 | |
| Dasysiphonia japonica | Germany / North Sea | 2015 | |
| Dasysiphonia japonica | Ireland | 2002 | |
| Dasysiphonia japonica | Italy / Adriatic Sea | 1999 | |
| Dasysiphonia japonica | Italy / Central Mediterranean | 2014 | |
| Dasysiphonia japonica | Netherlands | 1994 | |
| Dasysiphonia japonica | Norway / North Sea | 1996 | |
| Dasysiphonia japonica | Norway / Norwegian Sea | 1996 | |
| Dasysiphonia japonica | Spain / Iberian Coastal | 1990 - 1999 | |
| Dasysiphonia japonica | Sweden / North Sea | 2002 | |
| Dasysiphonia japonica | United Kingdom (Britain) / Celtic seas | 2004 | |
| Dasysiphonia japonica | United Kingdom (Britain) / English Channel | 2004 | |
| Dasysiphonia japonica | United Kingdom (Britain) / North Sea | 2004 | |
| Dasysiphonia japonica | United Kingdom (Britain) / North Sea / Orkney Islands | To 2011 | |
| Decapterus russelli | Israel | 2005 | |
| Dendostrea frons | Ireland | 1983 | |
| Dendostrea sandvichensis | Israel | 2005 | |
| Dendrocoelum romanodanubiale | Belgium | To 2001 | |
| Dendrocoelum romanodanubiale | Netherlands | To 2001 | |
| Dendrodoris fumata | Israel | 1980 | |
| Derbesia boergesenii | Israel | 2015 | |
| Derbesia marina | Australia / Bass strait | 1977 | |
| Derbesia rhizophora | France / Western Mediterranean | 1986 | |
| Derbesia rhizophora | Israel | 2015 | |
| Desdemona ornata | Greece / Eastern Mediterranean | 1986 | |
| Desdemona ornata | Italy / Adriatic Sea | 2002 | |
| Desdemona ornata | Italy / Western Mediterranean | To 1985 | |
| Desdemona ornata | Netherlands | To 2015 | |
| Desdemona ornata | Portugal / Iberian Coastal | To 1993 | |
| Desdemona ornata | Spain / Iberian Coastal | To 1998 | |
| Desdemona ornata | United Kingdom (Britain) / English Channel | 1997 | |
| Desmacella meliorata | Portugal / Azores | To 1979 | |
| Desmarestia ligulata | Iceland | 1967 | |
| Desmarestia viridis | France / Western Mediterranean | 1978 | |
| Desmarestia viridis | Germany / Baltic Sea | To 1990 | |
| Desmarestia viridis | Germany / North Sea | To 1881 | |
| Desmarestia viridis | Italy / Adriatic Sea | 1999 | |
| Desmarestia viridis | Netherlands | To 2005 | |
| Desmarestia viridis | Romania | 2004 | |
| Desmarestia viridis | Ukraine / Black Sea | From 1992 | |
| Detonula pumila | Bulgaria | 1999 | |
| Detonula pumila | Georgia | 2002 | |
| Deucalion levringii | Australia / Bass strait | 1975 | |
| Devaleraea ramentacea | Faroe Islands | To 1982 | |
| Devaleraea ramentacea | Germany / North Sea | 1975 | |
| Devaleraea ramentacea | Norway / North Sea | To 1999 | |
| Diadema antillarum | Spain / Canary Islands | To 2006 | |
| Diadema setosum | Greece / Eastern Mediterranean | 2010 | |
| Diadema setosum | Israel | 2017 | |
| Diadumene cincta | Belgium | To 2018 | |
| Diadumene cincta | France / Biscay Gulf | 1963 | |
| Diadumene cincta | France / Celtic seas | 1963 | |
| Diadumene cincta | France / English Channel | 1963 | |
| Diadumene cincta | France / North Sea | 1925 | |
| Diadumene cincta | Germany / North Sea | 1928 | |
| Diadumene cincta | Italy / Adriatic Sea | 1993 | |
| Diadumene cincta | Netherlands | 1925 | |
| Diadumene cincta | Sweden / North Sea | To 2023 | |
| Diadumene lineata | Belgium | 1998 | |
| Diadumene lineata | Bulgaria | 1960 - 1969 | |
| Diadumene lineata | Canada / Bay of Fundy | 2009 | |
| Diadumene lineata | Canada / South-eastern Scotian Shelf | 2013 | |
| Diadumene lineata | Denmark / Baltic Sea | 2008 | |
| Diadumene lineata | Denmark / North Sea | 2008 | |
| Diadumene lineata | France / Biscay Gulf | 1963 | |
| Diadumene lineata | France / Celtic seas | 1900 | |
| Diadumene lineata | France / North Sea | 1976 | |
| Diadumene lineata | France / Western Mediterranean | To 1971 | |
| Diadumene lineata | Germany / Baltic Sea | 2011 | |
| Diadumene lineata | Germany / North Sea | 1920 | |
| Diadumene lineata | Ireland | 1974 | |
| Diadumene lineata | Italy / Adriatic Sea | 1925 | |
| Diadumene lineata | Italy / Western Mediterranean | 1911 | |
| Diadumene lineata | Netherlands | 1912 | |
| Diadumene lineata | Romania | 1960 - 1969 | |
| Diadumene lineata | Sweden / North Sea | To 2022 | |
| Diadumene lineata | Ukraine / Black Sea | 1960 - 1969 | |
| Diadumene lineata | United Kingdom (Britain) / English Channel | 1899 | |
| Diadumene lineata | United Kingdom (Britain) / North Sea / Orkney Islands | 1994 | |
| Diala semistriata | Israel | 1935 | |
| Diamysis bahirensis | Portugal / Iberian Coastal | 1995 | |
| Dichotomaria obtusata | Israel | 2014 | |
| Dicroerisma psilonereiella | Sweden / North Sea | 1996 - 2000 | |
| Dictyota acutiloba | Israel | 2010 | |
| Dictyota cyanoloma | France / Western Mediterranean | 1999 | |
| Dictyota cyanoloma | Greece / Central Mediterranean | 2013 | |
| Dictyota cyanoloma | Italy / Western Mediterranean | To 2017 | |
| Dictyota dichotoma | Australia / Bass strait | 1966 | |
| Dictyota dichotoma | Denmark / Baltic Sea | 1939 | |
| Dictyota dichotoma | Denmark / North Sea | 1939 | |
| Dictyota dichotoma | Germany / North Sea | To 1854 | |
| Dictyota dichotoma | Netherlands | 1907 - 1926 | |
| Didemnum perlucidum | Portugal / Madeira | To 2012 | |
| Didemnum pseudovexillum | France / English Channel | 2015 | |
| Didemnum vexillum | Canada / Bay of Fundy | 2013 | |
| Didemnum vexillum | France / English Channel | 1998 | |
| Didemnum vexillum | France / North Sea | To 2001 | |
| Didemnum vexillum | Germany / North Sea | 2016 | |
| Didemnum vexillum | Ireland | 2005 | |
| Didemnum vexillum | Italy / Adriatic Sea | To 2007 | |
| Didemnum vexillum | Netherlands | To 1991 | |
| Didemnum vexillum | Norway / North Sea | 2020 | |
| Didemnum vexillum | Portugal / Iberian Coastal | 2020 | |
| Didemnum vexillum | Spain / Iberian Coastal | 2017 | |
| Didemnum vexillum | Sweden / North Sea | 2022 | |
| Didemnum vexillum | United Kingdom (Britain) / Celtic seas | 2005 | |
| Didemnum vexillum | United Kingdom (Britain) / English Channel | 2005 | |
| Dikerogammarus haemobaphes | Belgium | 1998 | |
| Dikerogammarus haemobaphes | France / Celtic seas | 1998 | |
| Dikerogammarus haemobaphes | Germany / Baltic Sea | To 2015 | |
| Dikerogammarus haemobaphes | Germany / North Sea | To 2017 | |
| Dikerogammarus haemobaphes | Poland | 1996 | |
| Dikerogammarus haemobaphes | Russia / Baltic Sea / Kaliningrad area | 1999 | |
| Dikerogammarus villosus | Belgium | 1998 | |
| Dikerogammarus villosus | France / Celtic seas | 1997 | |
| Dikerogammarus villosus | France / English Channel | 1997 | |
| Dikerogammarus villosus | Germany / Baltic Sea | 1990 - 2015 | |
| Dikerogammarus villosus | Germany / North Sea | 1995 | |
| Dikerogammarus villosus | Latvia | 2015 | |
| Dikerogammarus villosus | Lithuania | 2015 | |
| Dikerogammarus villosus | Netherlands | 1994 | |
| Dikerogammarus villosus | Poland | 2002 | |
| Dikoleps micalii | Israel | 2015 | |
| Dinophysis caudata | Sweden / Baltic Sea | 2019 | |
| Dinophysis islandica | Ukraine / Black Sea | 2001 | |
| Dinophysis nasuta | Ukraine / Black Sea | 2008 | |
| Dinophysis odiosa | Russia / Black Sea | 2008 | |
| Dinophysis odiosa | Ukraine / Black Sea | 2001 | |
| Dinophysis recurva | Ukraine / Black Sea | 2001 | |
| Dinophysis sacculus | Denmark / Baltic Sea | 2004 | |
| Dinophysis sacculus | Denmark / North Sea | 2004 | |
| Dinophysis schilleri | Ukraine / Black Sea | 2001 | |
| Dinophysis tripos | Sweden / Baltic Sea | To 2019 | |
| Diodora funiculata | Greece / Eastern Mediterranean | 2013 | |
| Diodora funiculata | Israel | 1998 | |
| Diodora ruppellii | Israel | 1939 | |
| Diopatra hupferiana hupferiana | Italy / Central Mediterranean | 1991 | |
| Diphasia digitalis | Israel | 2004 | |
| Diplocirrus stopbowitzi | France / English Channel | 2009 | |
| Diplopsalopsis orbicularis | Russia / Black Sea | 2004 | |
| Diplosoma listerianum | Belgium | To 2018 | |
| Diplosoma listerianum | Canada / South-eastern Scotian Shelf | 2012 | |
| Diplosoma listerianum | Canada / Southern Gulf of St. Lawrence and Eastern Scotian Shelf | 2008 | |
| Diplosoma listerianum | France / English Channel | 1977 | |
| Diplosoma listerianum | France / North Sea | 1977 | |
| Diplosoma listerianum | Germany / North Sea | To 1993 | |
| Diplosoma listerianum | Greece / Eastern Mediterranean | 1996 | |
| Diplosoma listerianum | Iceland | 2018 | |
| Diplosoma listerianum | Netherlands | To 1930 | |
| Diplosoma listerianum | Portugal / Madeira | 1992 - 1993 | |
| Diplosoma listerianum | United Kingdom (Britain) / North Sea / Orkney Islands | 1997 | |
| Diplothamnion jolyi | Israel | 2015 | |
| Dipolydora blakei | Greece / Central Mediterranean | 1991 | |
| Dipolydora blakei | Greece / Eastern Mediterranean | 1991 | |
| Dipolydora capensis | Spain / Iberian Coastal | To 2017 | |
| Dipolydora quadrilobata | Bulgaria | 1990 - 1999 | |
| Dipolydora quadrilobata | Romania | 2000 - 2009 | |
| Dipolydora socialis | Canada / Hudson Bay Complex | To 2012 | |
| Dipolydora socialis | Spain / Iberian Coastal | To 2017 | |
| Dipolydora tentaculata | Spain / Iberian Coastal | To 2005 | |
| Dispio magnus | Greece / Central Mediterranean | 1982 | |
| Dissodinium pseudocalani | Sweden / North Sea | 2003 | |
| Distaplia bermudensis | Italy / Central Mediterranean | 2000 | |
| Distaplia bermudensis | Portugal / Madeira | 2006 | |
| Distaplia corolla | Portugal / Azores | To 1971 | |
| Distaplia corolla | Portugal / Iberian Coastal | 2016 | |
| Distaplia corolla | Portugal / Madeira | To 2004 | |
| Distephanus speculum f. octonarius | Bulgaria | 1979 | |
| Distephanus speculum f. octonarius | Georgia | 1985 | |
| Distephanus speculum f. octonarius | Romania | 1979 | |
| Distephanus speculum f. octonarius | Ukraine / Black Sea | 1979 | |
| Divalinga arabica | Israel | 1976 | |
| Dodecaceria capensis | Greece / Central Mediterranean | 1980 | |
| Dodecaceria capensis | Greece / Eastern Mediterranean | 1975 | |
| Dorippe quadridens | Israel | 2004 | |
| Dorvillea similis | Greece / Eastern Mediterranean | 2014 | |
| Dorvillea similis | Italy / Western Mediterranean | 2018 | |
| Dreissena bugensis | Belgium | To 2009 | |
| Dreissena bugensis | Germany / Baltic Sea | 2014 | |
| Dreissena bugensis | Germany / North Sea | To 1950 | |
| Dreissena bugensis | Ireland | 2020 - 2021 | |
| Dreissena bugensis | Netherlands | To 2015 | |
| Dreissena bugensis | Poland | 2011 | |
| Dreissena bugensis | Russia / Baltic Sea / St. Petersburg area | 2004 | |
| Dreissena polymorpha | Belgium | 1826 | |
| Dreissena polymorpha | Estonia | 1801 - 1850 | |
| Dreissena polymorpha | Finland | 1995 | |
| Dreissena polymorpha | Germany / Baltic Sea | 1801 - 1850 | |
| Dreissena polymorpha | Germany / North Sea | 1824 | |
| Dreissena polymorpha | Ireland | 1993 | |
| Dreissena polymorpha | Latvia | 1801 - 1850 | |
| Dreissena polymorpha | Lithuania | 1801 - 1810 | |
| Dreissena polymorpha | Netherlands | 1826 | |
| Dreissena polymorpha | Poland | 1824 - 1828 | |
| Dreissena polymorpha | Russia / Baltic Sea / Kaliningrad area | 1824 | |
| Dreissena polymorpha | Russia / Baltic Sea / St. Petersburg area | 1970 - 1980 | |
| Dreissena polymorpha | Sweden / Baltic Sea | 2008 | |
| Dreissena polymorpha | United Kingdom (Britain) / Celtic seas | 1824 | |
| Dreissena polymorpha | United Kingdom (Britain) / North Sea | 1824 | |
| Drepanophora birbira | Israel | 2009 | |
| Dugesia tigrina | Belgium | To 2004 | |
| Dugesia tigrina | France / Celtic seas | 1950 | |
| Dugesia tigrina | Germany / North Sea | 1931 | |
| Dussumieria elopsoides | Israel | 1949 | |
| Dynamena quadridentata | Israel | 2004 | |
| Dysidea avara | Australia / Bass strait | 1889 | |
| Dysidea fragilis | Australia / Bass strait | 1889 | |
| Dyspanopeus sayi | France / Biscay Gulf | 2007 | |
| Dyspanopeus sayi | Greece / Eastern Mediterranean | 2015 | |
| Dyspanopeus sayi | Italy / Adriatic Sea | 1992 | |
| Dyspanopeus sayi | Italy / Central Mediterranean | 2011 - 2012 | |
| Dyspanopeus sayi | Italy / Western Mediterranean | 2011 - 2013 | |
| Dyspanopeus sayi | Portugal / Iberian Coastal | 2018 | |
| Dyspanopeus sayi | United Kingdom (Britain) / Celtic seas | 1950 - 1959 | |
| Echinogammarus ischnus | Germany / Baltic Sea | 2020 | |
| Echinogammarus ischnus | Germany / North Sea | To 1977 | |
| Echinogammarus trichiatus | Belgium | To 2009 | |
| Echinogammarus trichiatus | Germany / Baltic Sea | 2014 | |
| Ecteinascidia styeloides | France / Western Mediterranean | 1987 | |
| Ecteinascidia thurstoni | Israel | 2004 | |
| Ecteinascidia turbinata | Greece / Eastern Mediterranean | 1973 - 1983 | |
| Ectocarpus caspicus | Ukraine / Black Sea | From 1980 | |
| Ectocarpus fasciculatus | Australia / Bass strait | 1971 | |
| Ectocarpus siliculosus | Australia / Bass strait | 1966 | |
| Ectopleura crocea | Australia / Bass strait | 1884 | |
| Ectopleura crocea | Portugal / Azores | To 1989 | |
| Ectopleura crocea | Portugal / Madeira | To 1995 | |
| Edwardsia claparedii | Netherlands | To 1917 | |
| Edwardsiella lineata | Sweden / North Sea | 2007 - 2012 | |
| Eichhornia crassipes | Portugal / Iberian Coastal | 1936 | |
| Elachista sp. | Netherlands | 1993 | |
| Elasmopus pectenicrus | Italy / Adriatic Sea | 1980 | |
| Elasmopus pectenicrus | Italy / Central Mediterranean | 2001 | |
| Elates ransonnettii | Italy / Central Mediterranean | 2005 | |
| Electra pilosa | Australia / Bass strait | 1860 - 1869 | |
| Electra pilosa | Spain / Canary Islands | To 2003 | |
| Elodea canadensis | Estonia | 1900 - 1929 | |
| Elodea canadensis | Finland | 1870 - 1879 | |
| Elodea canadensis | Latvia | 1872 | |
| Elodea canadensis | Lithuania | 1884 | |
| Elodea canadensis | Norway / North Sea | 1925 | |
| Elodea canadensis | Norway / Norwegian Sea | To 2012 | |
| Elodea canadensis | Poland | 1866 | |
| Elodea canadensis | Russia / Baltic Sea / Kaliningrad area | 1884 | |
| Elodea canadensis | Russia / Baltic Sea / St. Petersburg area | 1881 - 1892 | |
| Elodea canadensis | Sweden / Baltic Sea | 1873 | |
| Elodea nuttallii | Belgium | 1939 | |
| Elodea nuttallii | France / North Sea | 1950 - 1959 | |
| Elodea nuttallii | Germany / North Sea | 1953 | |
| Elodea nuttallii | Ireland | 1974 | |
| Elodea nuttallii | Netherlands | 1941 | |
| Elodea nuttallii | Norway / North Sea | 2006 | |
| Elodea nuttallii | Poland | 2010 | |
| Elodea nuttallii | Sweden / Baltic Sea | 1991 | |
| Elodea nuttallii | United Kingdom (Britain) / North Sea | 1914 | |
| Elysia grandifolia | Israel | 2005 | |
| Emiliania huxleyi | Denmark / Baltic Sea | 1989 | |
| Emiliania huxleyi | Denmark / North Sea | 1989 | |
| Encrasicholina gloria | Israel | 2009 | |
| Endarachne binghamiae | Portugal / Azores | To 1985 | |
| Endeis biseriata | Italy / Western Mediterranean | 1979 - 1980 | |
| Engina mendicaria | Israel | 2001 | |
| Ensiculus cultellus | Israel | 2008 | |
| Ensis leei | Belgium | 1986 | |
| Ensis leei | Denmark / Baltic Sea | 1984 | |
| Ensis leei | Denmark / North Sea | 1981 | |
| Ensis leei | France / Biscay Gulf | 1991 | |
| Ensis leei | France / Celtic seas | 1991 | |
| Ensis leei | France / English Channel | 1992 | |
| Ensis leei | France / North Sea | 1991 | |
| Ensis leei | Germany / Baltic Sea | 1991 | |
| Ensis leei | Germany / North Sea | 1979 | |
| Ensis leei | Ireland | 2021 | |
| Ensis leei | Netherlands | 1981 | |
| Ensis leei | Norway / North Sea | 1989 | |
| Ensis leei | Spain / Iberian Coastal | 2011 | |
| Ensis leei | Sweden / North Sea | 1982 - 1986 | |
| Ensis leei | United Kingdom (Britain) / English Channel | 1989 | |
| Ensis leei | United Kingdom (Britain) / North Sea | 1989 | |
| Ensis terranovensis | Iceland | 2019 | |
| Eocuma dimorphum | Spain / Iberian Coastal | To 1999 | |
| Eocuma rosae | Israel | 2005 | |
| Eocuma sarsii | Israel | 2009 | |
| Epinephelus areolatus | Israel | 2015 | |
| Epinephelus caninus | Ukraine / Black Sea | 2013 | |
| Epinephelus chlorostigma | Israel | 2015 | |
| Epinephelus coioides | Israel | 1966 | |
| Epinephelus coioides | Italy / Adriatic Sea | 1998 | |
| Epinephelus fasciatus | Israel | 2013 | |
| Epinephelus malabaricus | Israel | 1966 | |
| Epitonium vaillanti | Israel | 2015 | |
| Equulites klunzingeri | Greece / Eastern Mediterranean | 1946 - 1964 | |
| Equulites klunzingeri | Israel | 1924 | |
| Equulites popei | Israel | 2011 | |
| Ercolania viridis | Ukraine / Black Sea | From 2001 | |
| Ergalatax contracta | Israel | 2001 | |
| Ergalatax junionae | Greece / Eastern Mediterranean | 2007 | |
| Ergalatax junionae | Israel | 2004 | |
| Ericthonius didymus | France / Biscay Gulf | 2013 | |
| Ericthonius didymus | France / Western Mediterranean | 2015 | |
| Ericthonius didymus | Italy / Adriatic Sea | 2000 - 2005 | |
| Eriocheir japonica | Belgium | To 1998 | |
| Eriocheir japonica | Germany / North Sea | To 2015 | |
| Eriocheir japonica | Netherlands | To 2015 | |
| Eriocheir japonica | Poland | 2015 | |
| Eriocheir sinensis | Belgium | 1933 | |
| Eriocheir sinensis | Denmark / Baltic Sea | 1935 | |
| Eriocheir sinensis | Denmark / North Sea | 1927 | |
| Eriocheir sinensis | Estonia | 1933 | |
| Eriocheir sinensis | Finland | 1933 | |
| Eriocheir sinensis | France / Biscay Gulf | 1930 | |
| Eriocheir sinensis | France / Celtic seas | 1930 | |
| Eriocheir sinensis | France / English Channel | 1930 | |
| Eriocheir sinensis | France / North Sea | 1930 | |
| Eriocheir sinensis | France / Western Mediterranean | 1959 | |
| Eriocheir sinensis | Germany / Baltic Sea | 1921 - 1929 | |
| Eriocheir sinensis | Germany / North Sea | 1912 | |
| Eriocheir sinensis | Ireland | 2006 | |
| Eriocheir sinensis | Italy / Adriatic Sea | 2005 | |
| Eriocheir sinensis | Latvia | 1932 | |
| Eriocheir sinensis | Lithuania | 1935 | |
| Eriocheir sinensis | Netherlands | 1930 | |
| Eriocheir sinensis | Norway / North Sea | 1976 | |
| Eriocheir sinensis | Poland | 1928 | |
| Eriocheir sinensis | Portugal / Iberian Coastal | 1988 | |
| Eriocheir sinensis | Romania | 1934 | |
| Eriocheir sinensis | Russia / Baltic Sea / Kaliningrad area | 1930 - 1933 | |
| Eriocheir sinensis | Russia / Baltic Sea / St. Petersburg area | 1930 - 1933 | |
| Eriocheir sinensis | Russia / White Sea | To 2010 | |
| Eriocheir sinensis | Spain / Iberian Coastal | 1997 | |
| Eriocheir sinensis | Sweden / Baltic Sea | 1932 | |
| Eriocheir sinensis | Sweden / North Sea | 1936 | |
| Eriocheir sinensis | Ukraine / Black Sea | 1998 - 2002 | |
| Eriocheir sinensis | United Kingdom (Britain) / Celtic seas | 1935 | |
| Eriocheir sinensis | United Kingdom (Britain) / English Channel | 1935 | |
| Eriocheir sinensis | United Kingdom (Britain) / North Sea | 1935 | |
| Eriphia verrucosa | France / English Channel | 1968 | |
| Erugosquilla massavensis | Greece / Central Mediterranean | 2017 | |
| Erugosquilla massavensis | Greece / Eastern Mediterranean | 1963 | |
| Erugosquilla massavensis | Israel | 1936 | |
| Erugosquilla massavensis | Italy / Central Mediterranean | 2017 | |
| Ervilia scaliola | Israel | 2016 | |
| Erythrocladia irregularis | Bulgaria | 1990 - 1999 | |
| Erythrotrichia carnea | Australia / Bass strait | 1994 | |
| Escharina vulgaris | Spain / Canary Islands | To 2003 | |
| Escharina vulgaris | Sweden / North Sea | To 2006 | |
| Ethmodiscus punctiger | Belgium | 1993 | |
| Ethmodiscus punctiger | Denmark / Baltic Sea | 1901 | |
| Ethmodiscus punctiger | Denmark / North Sea | 1901 | |
| Ethmodiscus punctiger | France / Biscay Gulf | 1978 | |
| Ethmodiscus punctiger | France / Celtic seas | | |
| Ethmodiscus punctiger | France / English Channel | 1978 | |
| Ethmodiscus punctiger | France / North Sea | 1978 | |
| Ethmodiscus punctiger | Germany / Baltic Sea | 1983 | |
| Ethmodiscus punctiger | Germany / North Sea | 1979 | |
| Ethmodiscus punctiger | Netherlands | 1981 | |
| Ethmodiscus punctiger | Norway / North Sea | 1979 | |
| Ethmodiscus punctiger | Sweden / Baltic Sea | 1990 | |
| Ethmodiscus punctiger | Sweden / North Sea | 1979 | |
| Ethmodiscus punctiger | United Kingdom (Britain) / English Channel | 1978 | |
| Etrumeus golani | Italy / Central Mediterranean | 2005 | |
| Etrumeus golanii | Greece / Eastern Mediterranean | 1999 | |
| Etrumeus golanii | Israel | 1961 | |
| Eucampia cornuta | France / Celtic seas | 2003 | |
| Eucampia cornuta | France / English Channel | 2003 | |
| Eucampia cornuta | United Kingdom (Britain) / English Channel | From 2003 | |
| Eucheilota menoni | Belgium | To 2012 | |
| Eucheilota menoni | France / Biscay Gulf | 2009 | |
| Eucheilota menoni | France / English Channel | To 2007 | |
| Eucheilota menoni | France / North Sea | 2007 | |
| Eucheilota menoni | Spain / Iberian Coastal | 2008 | |
| Eucheilota paradoxica | France / Western Mediterranean | 1977 | |
| Euchone incolor | Portugal / Iberian Coastal | To 2017 | |
| Euchone incolor | Spain / Iberian Coastal | To 2017 | |
| Euchone limnicola | Australia / Bass strait | 1984 | |
| Euchone limnicola | France / English Channel | 2016 | |
| Euchone limnicola | France / North Sea | 2015 | |
| Eucrate crenata | Israel | 1994 | |
| Eudendrium capillare | Ukraine / Black Sea | From 1990 | |
| Eudendrium carneum | Italy / Central Mediterranean | To 2015 | |
| Eudendrium carneum | Italy / Western Mediterranean | 1985 | |
| Eudendrium merulum | Italy / Central Mediterranean | 1984 | |
| Eudendrium merulum | Italy / Western Mediterranean | To 1991 | |
| Eudendrium vaginatum | Ukraine / Black Sea | From 1990 | |
| Eudistoma angolanum | Portugal / Azores | To 1971 | |
| Eudistoma angolanum | Portugal / Madeira | To 1974 | |
| Eunaticina papilla | Israel | 2017 | |
| Eunice tubifex | Israel | 1974 | |
| Euplana gracilis | Netherlands | 2002 | |
| Euplokamis dunlapae | Sweden / North Sea | 2011 | |
| Euryte longicauda longicauda | Bulgaria | 2000 | |
| Eurytemora americana | Belgium | 1938 | |
| Eurytemora americana | France / English Channel | 1977 | |
| Eurytemora americana | France / North Sea | 1977 | |
| Eurytemora americana | Netherlands | To 1963 | |
| Eurytemora americana | United Kingdom (Britain) / English Channel | 1931 | |
| Eurytemora carolleeae | Germany / Baltic Sea | 2012 | |
| Eurytemora carolleeae | Latvia | 2008 | |
| Eurytemora carolleeae | Netherlands | 2011 | |
| Eurytemora carolleeae | Poland | 2019 | |
| Eurytemora carolleeae | Russia / Baltic Sea | 2004 | |
| Eurytemora pacifica | France / Biscay Gulf | 2014 | |
| Eurytemora pacifica | France / Celtic seas | 1985 | |
| Eusarsiella zostericola | Netherlands | 2012 | |
| Eusarsiella zostericola | United Kingdom (Britain) / English Channel | 1870 | |
| Eusarsiella zostericola | United Kingdom (Britain) / North Sea | 1870 - 1940 | |
| Euthymella colzumensis | Greece / Eastern Mediterranean | 2017 | |
| Euthymonacha polita | Greece / Eastern Mediterranean | 2012 | |
| Eutintinnus apertus | Ukraine / Black Sea | From 2002 | |
| Eutintinnus hastae | Ukraine / Black Sea | From 2002 | |
| Eutintinnus lususundae | Bulgaria | 2001 | |
| Eutintinnus lususundae | Romania | 2001 | |
| Eutintinnus lususundae | Russia / Black Sea | 2001 | |
| Eutintinnus lususundae | Turkey / Black Sea | 2001 | |
| Eutintinnus lususundae | Ukraine / Black Sea | From 2001 | |
| Eutintinnus tubulosus | Russia / Black Sea | 2001 | |
| Eutintinnus tubulosus | Ukraine / Black Sea | From 2001 | |
| Evadne anonyx | Estonia | 1999 | |
| Evadne anonyx | Finland | 1998 | |
| Evadne anonyx | Germany / Baltic Sea | 2014 | |
| Evadne anonyx | Latvia | 2000 - 2001 | |
| Evadne anonyx | Lithuania | 2011 | |
| Evadne anonyx | Poland | 2006 | |
| Evadne anonyx | Russia / Baltic Sea / Kaliningrad area | 2007 | |
| Evadne anonyx | Russia / Baltic Sea / St. Petersburg area | 2000 | |
| Evadne anonyx | Sweden / Baltic Sea | 2008 | |
| Evelineus mcintoshii | Israel | 2014 | |
| Favella brevis | Ukraine / Black Sea | From 2002 | |
| Favorinus ghanensis | Italy / Western Mediterranean | 2021 | |
| Faxonius immunis | Netherlands | 2019 | |
| Faxonius limosus | Belgium | 1950 - 1959 | |
| Faxonius limosus | Estonia | 2017 | |
| Faxonius limosus | France / Biscay Gulf | 1911 - 1913 | |
| Faxonius limosus | France / Celtic seas | To 2014 | |
| Faxonius limosus | France / English Channel | 1911 - 1913 | |
| Faxonius limosus | France / North Sea | To 2014 | |
| Faxonius limosus | Germany / Baltic Sea | 1880 | |
| Faxonius limosus | Latvia | 2006 | |
| Faxonius limosus | Lithuania | 1994 | |
| Faxonius limosus | Netherlands | 1968 | |
| Faxonius limosus | Poland | 1890 | |
| Faxonius virilis | Netherlands | 2004 | |
| Faxonius virilis | Sweden / North Sea | 1959 - 1960 | |
| Feldmannia globifera | Australia / Bass strait | 1966 | |
| Feldmannia irregularis | Australia / Bass strait | 1971 | |
| Feldmannia lebelii | Australia / Bass strait | 1971 | |
| Feldmannia mitchelliae | Australia / Bass strait | 1971 | |
| Fenestrulina delicia | Belgium | To 2011 | |
| Fenestrulina delicia | France / English Channel | 2007 | |
| Fenestrulina delicia | France / North Sea | 2010 | |
| Fenestrulina delicia | Germany / North Sea | 2011 | |
| Fenestrulina delicia | Netherlands | To 2005 | |
| Fenestrulina delicia | United Kingdom (Britain) / North Sea / Orkney Islands | 2018 | |
| Fenestrulina malusii | Australia / Bass strait | 1879 | |
| Fenestrulina malusii | Denmark / Baltic Sea | 2017 | |
| Fenestrulina malusii | Denmark / North Sea | 2011 | |
| Fenestrulina malusii | Netherlands | To 2018 | |
| Fenestrulina malusii | Spain / Canary Islands | To 2003 | |
| Ferrissia californica | Germany / Baltic Sea | To 2013 | |
| Ferrissia californica | Germany / North Sea | 1981 - 1989 | |
| Ferrissia fragilis | Belgium | To 1937 | |
| Ferrissia fragilis | Portugal / Azores | 2007 | |
| Fibrocapsa japonica | France / Biscay Gulf | 1992 | |
| Fibrocapsa japonica | France / Celtic seas | 1991 | |
| Fibrocapsa japonica | France / English Channel | 1991 | |
| Fibrocapsa japonica | Germany / North Sea | 1992 | |
| Fibrocapsa japonica | Netherlands | 1991 | |
| Fibrocapsa japonica | Norway / North Sea | 1898 | |
| Fibrocapsa japonica | Sweden / North Sea | To 1924 | |
| Ficopomatus enigmaticus | Australia / Bass strait | 1975 | |
| Ficopomatus enigmaticus | Belgium | To 1950 | |
| Ficopomatus enigmaticus | Bulgaria | 1935 | |
| Ficopomatus enigmaticus | Denmark / Baltic Sea | 1939 | |
| Ficopomatus enigmaticus | Denmark / North Sea | 1953 | |
| Ficopomatus enigmaticus | France / Biscay Gulf | 1921 | |
| Ficopomatus enigmaticus | France / Celtic seas | 1921 | |
| Ficopomatus enigmaticus | France / English Channel | 1921 | |
| Ficopomatus enigmaticus | France / Western Mediterranean | 1947 | |
| Ficopomatus enigmaticus | Georgia | 1929 | |
| Ficopomatus enigmaticus | Germany / Baltic Sea | 2014 | |
| Ficopomatus enigmaticus | Germany / North Sea | 1975 | |
| Ficopomatus enigmaticus | Greece / Central Mediterranean | 1981 | |
| Ficopomatus enigmaticus | Greece / Eastern Mediterranean | 1959 | |
| Ficopomatus enigmaticus | Ireland | 1971 | |
| Ficopomatus enigmaticus | Israel | 1954 | |
| Ficopomatus enigmaticus | Italy / Adriatic Sea | 1934 | |
| Ficopomatus enigmaticus | Italy / Central Mediterranean | To 1955 | |
| Ficopomatus enigmaticus | Italy / Western Mediterranean | 1919 | |
| Ficopomatus enigmaticus | Netherlands | 1968 | |
| Ficopomatus enigmaticus | Portugal / Azores | 2016 | |
| Ficopomatus enigmaticus | Portugal / Iberian Coastal | To 1979 | |
| Ficopomatus enigmaticus | Romania | 1954 | |
| Ficopomatus enigmaticus | Russia / Azov Sea | To 1960 | |
| Ficopomatus enigmaticus | Russia / Black Sea | 1961 | |
| Ficopomatus enigmaticus | Spain / Iberian Coastal | To 2000 | |
| Ficopomatus enigmaticus | Sweden / Baltic Sea | 2013 | |
| Ficopomatus enigmaticus | Sweden / North Sea | | |
| Ficopomatus enigmaticus | Turkey / Black Sea | 2004 | |
| Ficopomatus enigmaticus | Ukraine / Black Sea | From 1961 | |
| Ficopomatus enigmaticus | United Kingdom (Britain) / Celtic seas / Channel Islands | To 1952 | |
| Ficopomatus enigmaticus | United Kingdom (Britain) / English Channel | To 1937 | |
| Ficopomatus enigmaticus | United Kingdom (Britain) / North Sea | 1922 | |
| Filellum serpens | Australia / Bass strait | 1984 | |
| Finella pupoides | Israel | 1958 | |
| Fistularia commersonii | France / Western Mediterranean | 2007 | |
| Fistularia commersonii | Greece / Central Mediterranean | 2007 | |
| Fistularia commersonii | Greece / Eastern Mediterranean | 2001 | |
| Fistularia commersonii | Israel | 2000 | |
| Fistularia commersonii | Italy / Central Mediterranean | 2002 | |
| Fistularia commersonii | Italy / Western Mediterranean | 2003 | |
| Fistularia petimba | France / Biscay Gulf | 2018 | |
| Fistularia petimba | Israel | 2016 | |
| Fistulobalanus albicostatus | France / Biscay Gulf | 1973 | |
| Fistulobalanus albicostatus | France / Celtic seas | 1974 | |
| Forsterygion lapillum | Australia / Bass strait | 1996 | |
| Fucus distichus | Germany / Baltic Sea | To 2017 | |
| Fucus distichus | Germany / North Sea | To 2020 | |
| Fucus distichus | United Kingdom (Britain) / Celtic seas | 1980 | |
| Fucus distichus | United Kingdom (Britain) / North Sea | 1980 | |
| Fucus distichus subsp. evanescens | Iceland | 1976 | |
| Fucus evanescens | Denmark / Baltic Sea | 1948 | |
| Fucus evanescens | Denmark / North Sea | 1948 | |
| Fucus evanescens | Germany / Baltic Sea | 1990 | |
| Fucus evanescens | Norway / North Sea | 1898 | |
| Fucus evanescens | Sweden / Baltic Sea | 1955 | |
| Fucus evanescens | Sweden / North Sea | 1924 | |
| Fucus serratus | Iceland | 1900 | |
| Fucus spiralis | France / Western Mediterranean | 1987 | |
| Fucus spiralis | Portugal / Azores | 1960 | |
| Fulvia (Fulvia) fragilis | Italy / Central Mediterranean | 2006 | |
| Fulvia (Fulvia) fragilis | Italy / Western Mediterranean | 2003 | |
| Fulvia australis | Israel | 1948 | |
| Fulvia fragilis | Greece / Central Mediterranean | 2015 | |
| Fulvia fragilis | Greece / Eastern Mediterranean | 1997 | |
| Fulvia fragilis | Israel | 1955 | |
| Fundulus heteroclitus | Portugal / Iberian Coastal | 1976 | |
| Fundulus heteroclitus | Spain / Iberian Coastal | 1970 - 1979 | |
| Fusinus rostratus | Spain / Iberian Coastal | 2007 | |
| Fusinus verrucosus | Israel | 1929 | |
| Gafrarium savignyi | Israel | 1984 | |
| Galaxaura rugosa | Israel | 2003 | |
| Gambusia affinis | Turkey / Black Sea | 1960 | |
| Gammarus tigrinus | Belgium | 1995 | |
| Gammarus tigrinus | Denmark / Baltic Sea | 1990 | |
| Gammarus tigrinus | Denmark / North Sea | 1990 | |
| Gammarus tigrinus | Estonia | 2003 | |
| Gammarus tigrinus | Finland | 2003 | |
| Gammarus tigrinus | France / Celtic seas | 1970 | |
| Gammarus tigrinus | France / English Channel | 2005 | |
| Gammarus tigrinus | France / North Sea | 2005 | |
| Gammarus tigrinus | Germany / Baltic Sea | 1975 | |
| Gammarus tigrinus | Germany / North Sea | 1957 | |
| Gammarus tigrinus | Ireland | 1916 - 1960 | |
| Gammarus tigrinus | Latvia | 2011 - 2013 | |
| Gammarus tigrinus | Lithuania | 2004 | |
| Gammarus tigrinus | Netherlands | 1960 | |
| Gammarus tigrinus | Poland | 1988 | |
| Gammarus tigrinus | Russia / Baltic Sea / Kaliningrad area | 1999 | |
| Gammarus tigrinus | Russia / Baltic Sea / St. Petersburg area | 2005 | |
| Gammarus tigrinus | Sweden / Baltic Sea | 2000 - 2010 | |
| Gammogobius steinitzi | Ukraine / Black Sea | 2012 | |
| Ganonema farinosum | Greece / Eastern Mediterranean | 1800 - 1832 | |
| Ganonema farinosum | Israel | 1945 | |
| Gari pallida | Israel | 2017 | |
| Garveia franciscana | Belgium | 1956 | |
| Garveia franciscana | Bulgaria | 1933 | |
| Garveia franciscana | France / English Channel | 1952 | |
| Garveia franciscana | France / North Sea | 1952 | |
| Garveia franciscana | France / Western Mediterranean | 1978 | |
| Garveia franciscana | Germany / Baltic Sea | 2014 | |
| Garveia franciscana | Germany / North Sea | To 1952 | |
| Garveia franciscana | Italy / Adriatic Sea | 1978 | |
| Garveia franciscana | Netherlands | 1920 | |
| Garveia franciscana | Russia / Black Sea | 1950 - 1959 | |
| Garveia franciscana | Ukraine / Azov Sea | 1950 - 1959 | |
| Gayliella fimbriata | Israel | 2013 | |
| Gayliella flaccida | Australia / Bass strait | 1981 | |
| Gelidiella nigrescens | Turkey / Black Sea | 2000 - 2009 | |
| Gelidiella ramellosa | Turkey / Black Sea | 2000 - 2009 | |
| Gelidiocolax christianae | Turkey / Black Sea | 2000 - 2009 | |
| Gelidium corneum | Turkey / Black Sea | 2000 - 2009 | |
| Gelidium pulchellum | Turkey / Black Sea | 2000 - 2009 | |
| Gelidium pusillum | Australia / Bass strait | 1971 | |
| Gelidium pusillum | Turkey / Black Sea | 1990 - 1999 | |
| Gelidium spathulatum | Turkey / Black Sea | 2000 - 2009 | |
| Gelidium vagum | Netherlands | 2010 | |
| Gibborissoa virgata | Israel | 1970 | |
| Gibbula adansoni | Spain / Iberian Coastal | 1994 | |
| Gibbula adriatica | Spain / Iberian Coastal | 2000 | |
| Gibbula albida | France / Biscay Gulf | 1973 | |
| Gibbula albida | France / Celtic seas | 1984 | |
| Gibbula albida | France / English Channel | 2017 | |
| Gibbula albida | Spain / Iberian Coastal | 1984 | |
| Gibbula ardens | France / North Sea | 2010 | |
| Gibbula cineraria | Netherlands | 1980 - 1989 | |
| Glabropilumnus laevis | Italy / Western Mediterranean | 1956 | |
| Gloniella clavatispora | Ukraine / Black Sea | 2002 | |
| Glycera capitata | Ukraine / Black Sea | 1970 - 1979 | |
| Glycera dayi | Spain / Canary Islands | To 2001 | |
| Glycera dayi | Spain / Iberian Coastal | To 2007 | |
| Glycinde bonhourei | Greece / Eastern Mediterranean | 2007 | |
| Glycinde bonhourei | Israel | 1972 | |
| Glycymeris glycymeris | Netherlands | To 2017 | |
| Glyphidohaptor plectocirra | Greece / Eastern Mediterranean | 2010 | |
| Glyphidohaptor plectocirra | Israel | 1971 | |
| Gmelinoides fasciatus | Russia / Baltic Sea / St. Petersburg area | 1996 | |
| Gobiosoma bosc | Belgium | 2018 | |
| Gobiosoma bosc | Germany / North Sea | 2009 | |
| Gobiosoma bosc | Netherlands | 2017 | |
| Gobius cruentatus | Turkey / Black Sea | 2006 | |
| Gobius cruentatus | Ukraine / Black Sea | 2002 | |
| Gobius xanthocephalus | Georgia | 2000 - 2009 | |
| Gobius xanthocephalus | Ukraine / Black Sea | 1967 | |
| Godiva quadricolor | Italy / Adriatic Sea | 2011 | |
| Godiva quadricolor | Italy / Central Mediterranean | 2015 | |
| Godiva quadricolor | Italy / Western Mediterranean | 1985 | |
| Godiva quadricolor | Spain / Iberian Coastal | 2006 | |
| Goneplax rhomboides | Germany / North Sea | 2008 | |
| Goneplax rhomboides | Netherlands | 2008 | |
| Goneplax rhomboides | Norway / North Sea | 2009 | |
| Goniadella gracilis | France / Biscay Gulf | 2001 | |
| Goniadella gracilis | France / Celtic seas | To 2001 | |
| Goniadella gracilis | France / English Channel | 1982 | |
| Goniadella gracilis | Norway / North Sea | To 2012 | |
| Goniadella gracilis | Norway / Norwegian Sea | To 2010 | |
| Goniadella gracilis | Portugal / Iberian Coastal | To 2017 | |
| Goniadella gracilis | United Kingdom (Britain) / Celtic seas | 1970 | |
| Goniadella gracilis | United Kingdom (Britain) / North Sea / Orkney Islands | 2018 | |
| Goniobranchus annulatus | Greece / Eastern Mediterranean | 2004 | |
| Goniobranchus annulatus | Israel | 2009 | |
| Goniobranchus obsoletus | Israel | 2015 | |
| Gonioinfradens giardi | Israel | 2015 | |
| Gonioinfradens paucidentatus | Greece / Eastern Mediterranean | 2010 | |
| Gonionemus vertens | Belgium | 1946 | |
| Gonionemus vertens | Denmark / Baltic Sea | 1960 | |
| Gonionemus vertens | Denmark / North Sea | 1960 | |
| Gonionemus vertens | France / Biscay Gulf | 1867 | |
| Gonionemus vertens | France / Celtic seas | 1867 | |
| Gonionemus vertens | France / English Channel | 1929 | |
| Gonionemus vertens | France / North Sea | 1913 | |
| Gonionemus vertens | France / Western Mediterranean | 2016 | |
| Gonionemus vertens | Germany / North Sea | 1947 | |
| Gonionemus vertens | Iceland | 2008 | |
| Gonionemus vertens | Italy / Adriatic Sea | 1972 | |
| Gonionemus vertens | Italy / Western Mediterranean | 1957 - 1958 | |
| Gonionemus vertens | Netherlands | 1960 | |
| Gonionemus vertens | Norway / North Sea | 1921 | |
| Gonionemus vertens | Norway / Norwegian Sea | 1921 | |
| Gonionemus vertens | Portugal / Iberian Coastal | To 1700 | |
| Gonionemus vertens | Sweden / North Sea | 1921 - 1923 | |
| Gonionemus vertens | United Kingdom (Britain) / Celtic seas / Channel Islands | 1924 | |
| Gonionemus vertens | United Kingdom (Britain) / English Channel | To 1963 | |
| Gonionemus vertens | United Kingdom (Britain) / North Sea | 1913 | |
| Goniotrichopsis sublittoralis | France / Biscay Gulf | 1975 | |
| Goniotrichopsis sublittoralis | France / Celtic seas | 1975 | |
| Goniotrichopsis sublittoralis | France / Western Mediterranean | 1998 | |
| Gracilaria armata | Turkey / Black Sea | 2000 - 2009 | |
| Gracilaria chorda | France / Biscay Gulf | 2010 | |
| Gracilaria multipartita | Ireland | 1977 | |
| Gracilipurpura rostrata | France / English Channel | 2007 | |
| Grallatoria reptans | Portugal / Azores | 2005 - 2007 | |
| Grallatoria reptans | Spain / Canary Islands | To 1995 | |
| Grandidierella bonnieroides | Israel | 2014 | |
| Grandidierella japonica | Belgium | 2018 | |
| Grandidierella japonica | Denmark / Baltic Sea | 2018 | |
| Grandidierella japonica | Denmark / North Sea | 2018 | |
| Grandidierella japonica | France / Biscay Gulf | 2010 | |
| Grandidierella japonica | France / Celtic seas | 2015 | |
| Grandidierella japonica | Germany / Baltic Sea | 2015 | |
| Grandidierella japonica | Italy / Adriatic Sea | 2015 | |
| Grandidierella japonica | Italy / Western Mediterranean | 2013 | |
| Grandidierella japonica | Spain / Spain | 2017 | |
| Grandidierella japonica | Sweden / Baltic Sea | 2010 | |
| Grandidierella japonica | United Kingdom (Britain) / English Channel | 1997 | |
| Grandidierella japonica | United Kingdom (Britain) / North Sea | 2004 - 2005 | |
| Grateloupia asiatica | France / Western Mediterranean | 1984 | |
| Grateloupia imbricata | Portugal / Madeira | To 2005 | |
| Grateloupia imbricata | Spain / Canary Islands | To 2008 | |
| Grateloupia lanceolata | France / Western Mediterranean | 1982 | |
| Grateloupia lanceolata | Portugal / Madeira | To 2006 | |
| Grateloupia luxurians | United Kingdom (Britain) / English Channel | To 1947 | |
| Grateloupia minima | France / Western Mediterranean | 1998 | |
| Grateloupia minima | Italy / Central Mediterranean | 2010 | |
| Grateloupia patens | France / Western Mediterranean | 1994 | |
| Grateloupia subpectinata | Denmark / Baltic Sea | 2015 | |
| Grateloupia subpectinata | Denmark / North Sea | 2015 | |
| Grateloupia subpectinata | France / Biscay Gulf | To 1992 | |
| Grateloupia subpectinata | France / Celtic seas | 1992 | |
| Grateloupia subpectinata | France / English Channel | 1992 | |
| Grateloupia subpectinata | France / Western Mediterranean | 2001 | |
| Grateloupia subpectinata | Portugal / Azores | From 1914 | |
| Grateloupia subpectinata | Spain / Iberian Coastal | 1990 | |
| Grateloupia subpectinata | United Kingdom (Britain) / Celtic seas / Channel Islands | 1947 | |
| Grateloupia turuturu | Denmark / Baltic Sea | 2021 | |
| Grateloupia turuturu | Denmark / North Sea | 2021 | |
| Grateloupia turuturu | France / Biscay Gulf | 1989 | |
| Grateloupia turuturu | France / Celtic seas | 1989 | |
| Grateloupia turuturu | France / English Channel | 1992 | |
| Grateloupia turuturu | France / Western Mediterranean | 1982 | |
| Grateloupia turuturu | Israel | 2013 | |
| Grateloupia turuturu | Italy / Adriatic Sea | 1989 | |
| Grateloupia turuturu | Italy / Central Mediterranean | 2007 | |
| Grateloupia turuturu | Netherlands | 1993 | |
| Grateloupia turuturu | Norway / North Sea | 2018 | |
| Grateloupia turuturu | Portugal / Azores | 1914 | |
| Grateloupia turuturu | Portugal / Iberian Coastal | 1997 | |
| Grateloupia turuturu | Portugal / Madeira | To 2002 | |
| Grateloupia turuturu | Spain / Iberian Coastal | 1990 | |
| Grateloupia turuturu | United Kingdom (Britain) / Celtic seas | 1969 | |
| Grateloupia turuturu | United Kingdom (Britain) / English Channel | 1969 | |
| Grateloupia yinggehaiensis | Italy / Adriatic Sea | 2008 - 2013 | |
| Griffithsia corallinoides | France / English Channel | 1954 | |
| Griffithsia corallinoides | France / North Sea | 1977 | |
| Griffithsia corallinoides | France / Western Mediterranean | 1984 | |
| Griffithsia corallinoides | Italy / Western Mediterranean | 1963 - 1964 | |
| Griffithsia corallinoides | Portugal / Azores | 1990 | |
| Gymnodinium aureolum | Bulgaria | 2008 | |
| Gymnodinium aureolum | France / Biscay Gulf | 1987 | |
| Gymnodinium aureolum | France / English Channel | 1976 | |
| Gymnodinium aureolum | Germany / North Sea | To 1968 | |
| Gymnodinium aureolum | Norway / North Sea | 1966 | |
| Gymnodinium aureolum | Norway / Norwegian Sea | 1966 | |
| Gymnodinium aureolum | Romania | 2007 | |
| Gymnodinium aureolum | Ukraine / Black Sea | From 2002 | |
| Gymnodinium catenatum | Bulgaria | 2008 | |
| Gymnodinium catenatum | Greece / Eastern Mediterranean | 1989 | |
| Gymnodinium catenatum | Netherlands | 1991 | |
| Gymnodinium catenatum | Portugal / Iberian Coastal | To 1898 | |
| Gymnodinium catenatum | Spain / Iberian Coastal | 1976 | |
| Gymnodinium catenatum | Ukraine / Black Sea | 2001 | |
| Gymnodinium catenatum | United Kingdom (Britain) / English Channel | | |
| Gymnodinium fuscum | Bulgaria | 1980 - 1989 | |
| Gymnodinium microreticulatum | Portugal / Iberian Coastal | To 1999 | |
| Gymnodinium nanum | Bulgaria | 2008 | |
| Gymnodinium nolleri | Germany / Baltic Sea | To 1993 | |
| Gymnodinium nolleri | Germany / North Sea | To 1992 | |
| Gymnodinium nolleri | Sweden / North Sea | To 2003 | |
| Gymnodinium pulchrum | Bulgaria | 1999 | |
| Gymnodinium radiatum | Georgia | 2000 | |
| Gymnodinium radiatum | Ukraine / Black Sea | From 1998 | |
| Gymnodinium stellatum | Georgia | 2008 | |
| Gymnodinium stellatum | Russia / Black Sea | 2008 | |
| Gymnodinium uberrimum | Bulgaria | 1991 | |
| Gymnodinium uberrimum | Turkey / Black Sea | 1998 | |
| Gymnodinium uberrimum | Ukraine / Black Sea | From 1999 | |
| Gymnogongrus crenulatus | Australia / Bass strait | 1969 | |
| Gymnomuraena zebra | Denmark / Baltic Sea | 2002 | |
| Gymnomuraena zebra | Denmark / North Sea | 2002 | |
| Gymnophycus hapsiphorus | Spain / Canary Islands | 1989 | |
| Gymnothamnion elegans | Australia / Bass strait | 1993 | |
| Gymnothorax reticularis | Israel | 2013 | |
| Gyrodactylus mugili | Ukraine / Black Sea | From 1995 | |
| Gyrodactylus salaris | Norway / North Sea | 1971 - 1980 | |
| Gyrodactylus salaris | Norway / Norwegian Sea | 1971 - 1980 | |
| Gyrodactylus zhukovi | Ukraine / Black Sea | From 1995 | |
| Gyrodinium cochlea | Bulgaria | 2008 | |
| Gyrodinium corallinum | Sweden / North Sea | To 2001 | |
| Gyrodinium flagellare | Bulgaria | 2008 | |
| Gyrodinium impudicum | Ukraine / Black Sea | From 2001 | |
| Gyrodinium instriatum | Ukraine / Black Sea | From 2003 | |
| Gyrodinium varians | Bulgaria | 2008 | |
| Halecium delicatulum | Australia / Bass strait | 1966 | |
| Halichondria panicea | USA / California Current | 2012 | |
| Haliclona (Haliclona) simulans | Netherlands | 2001 | |
| Haliclona (Halicoclona) vansoesti | Italy / Central Mediterranean | 2019 | |
| Haliclona (Reniera) cinerea | Netherlands | 1951 | |
| Haliclona (Rhizoniera) rosea | Australia / Bass strait | 1996 | |
| Haliclona (Rhizoniera) rosea | Netherlands | 1951 | |
| Haliclona Haliclona) urceolus | Netherlands | 1985 | |
| Haliclona indistincta | Portugal / Madeira | To 2012 | |
| Haliclona xena | Belgium | To 1988 | |
| Haliclona xena | Germany / North Sea | To 2007 | |
| Haliclona xena | Netherlands | To 1977 | |
| Haliclona xena | USA / California Current | 2012 | |
| Haliclystus salpinx | Netherlands | 2010 | |
| Haliclystus tenuis | Germany / North Sea | 2010 | |
| Haligena elaterophora | Ukraine / Black Sea | 1991 | |
| Halimede tyche | Israel | 1998 | |
| Haliotis discus | China / Yellow Sea | To 2001 | |
| Haliotis discus | Ireland | 1985 | |
| Haliotis fulgens | China / Yellow Sea | To 2001 | |
| Haliotis gigantea | China / Yellow Sea | From 2004 | |
| Haliotis pustulata | Israel | 1961 | |
| Haliotis rufescens | China / Yellow Sea | To 2001 | |
| Haliotis tuberculata | Ireland | 1976 | |
| Halisarca dujardinii | Australia / Bass strait | 1996 | |
| Halisarca dujardinii | Netherlands | 2005 | |
| Halisarca dujardinii | USA / California Current | 2012 | |
| Halophila decipiens | Greece / Eastern Mediterranean | 2018 | |
| Halophila stipulacea | France / Western Mediterranean | 2021 | |
| Halophila stipulacea | Greece / Central Mediterranean | 1958 | |
| Halophila stipulacea | Greece / Eastern Mediterranean | 1894 | |
| Halophila stipulacea | Italy / Central Mediterranean | 1988 | |
| Halophila stipulacea | Italy / Western Mediterranean | 1995 | |
| Halosarpheia phragmiticola | Ukraine / Black Sea | 2006 | |
| Halothrix lumbricalis | France / Western Mediterranean | 1985 | |
| Halothrix lumbricalis | Italy / Adriatic Sea | 1992 | |
| Halothrix lumbricalis | Italy / Central Mediterranean | 1978 | |
| Halothrix lumbricalis | Turkey / Black Sea | 1998 | |
| Haminoea japonica | France / Biscay Gulf | 1993 | |
| Haminoea japonica | France / English Channel | 2013 | |
| Haminoea japonica | France / Western Mediterranean | 2003 | |
| Haminoea japonica | Italy / Adriatic Sea | 1992 | |
| Haminoea japonica | Italy / Western Mediterranean | 2007 - 2012 | |
| Haminoea japonica | Spain / Iberian Coastal | 1989 | |
| Haminoea solitaria | Denmark / Baltic Sea | 2020 | |
| Haminoea solitaria | Denmark / North Sea | 2020 | |
| Haminoea solitaria | Germany / Baltic Sea | 2016 | |
| Haplosporidium armoricanum | France / English Channel | To 1974 | |
| Haplosporidium armoricanum | Netherlands | 1974 | |
| Haplosporidium armoricanum | Spain / Iberian Coastal | 1999 | |
| Haplosporidium nelsoni | France / Biscay Gulf | 1970 - 1979 | |
| Haplosporidium nelsoni | France / Celtic seas | 1979 | |
| Haplosporidium nelsoni | France / English Channel | 1970 - 1979 | |
| Haplosporidium nelsoni | France / North Sea | 1970 - 1979 | |
| Haplosporidium nelsoni | France / Western Mediterranean | 1970 - 1979 | |
| Haplosporidium nelsoni | Ireland | 1993 - 2007 | |
| Hediste diversicolor | Russia / Caspian Sea | 1944 | |
| Heleobia charruana | Belgium | To 2018 | |
| Heleobia charruana | Netherlands | 2018 | |
| Hemigrapsus penicillatus | Belgium | 2003 | |
| Hemigrapsus penicillatus | France / Biscay Gulf | 1994 | |
| Hemigrapsus penicillatus | France / Celtic seas | 1994 | |
| Hemigrapsus penicillatus | France / English Channel | 1994 | |
| Hemigrapsus penicillatus | Netherlands | 2000 | |
| Hemigrapsus penicillatus | Spain / Iberian Coastal | To 1996 | |
| Hemigrapsus sanguineus | Belgium | To 2011 | |
| Hemigrapsus sanguineus | Denmark / Baltic Sea | 2017 | |
| Hemigrapsus sanguineus | Denmark / North Sea | 2011 | |
| Hemigrapsus sanguineus | France / Biscay Gulf | 1999 | |
| Hemigrapsus sanguineus | France / English Channel | 1999 | |
| Hemigrapsus sanguineus | France / North Sea | 2000 | |
| Hemigrapsus sanguineus | Germany / North Sea | 2006 | |
| Hemigrapsus sanguineus | Netherlands | 1999 | |
| Hemigrapsus sanguineus | Romania | 2008 | |
| Hemigrapsus sanguineus | Sweden / North Sea | 2012 | |
| Hemigrapsus takanoi | Belgium | 2003 | |
| Hemigrapsus takanoi | Denmark / Baltic Sea | 2018 | |
| Hemigrapsus takanoi | Denmark / North Sea | 2011 | |
| Hemigrapsus takanoi | France / Biscay Gulf | 1994 | |
| Hemigrapsus takanoi | France / Celtic seas | 1999 | |
| Hemigrapsus takanoi | France / English Channel | 1994 | |
| Hemigrapsus takanoi | France / North Sea | 1999 | |
| Hemigrapsus takanoi | Germany / Baltic Sea | 2014 | |
| Hemigrapsus takanoi | Germany / North Sea | 2007 | |
| Hemigrapsus takanoi | Netherlands | 1999 | |
| Hemigrapsus takanoi | Norway / North Sea | To 2019 | |
| Hemigrapsus takanoi | Poland | 2023 | |
| Hemigrapsus takanoi | Sweden / Baltic Sea | To 2019 | |
| Hemigrapsus takanoi | Sweden / North Sea | 2016 | |
| Hemiliostraca clandestina | Israel | 2018 | |
| Hemimysis anomala | Belgium | 1999 | |
| Hemimysis anomala | Estonia | 2009 | |
| Hemimysis anomala | Finland | 1992 | |
| Hemimysis anomala | France / Celtic seas | 2000 | |
| Hemimysis anomala | France / English Channel | 2000 | |
| Hemimysis anomala | France / North Sea | 2000 | |
| Hemimysis anomala | Germany / Baltic Sea | 1995 - 2015 | |
| Hemimysis anomala | Germany / North Sea | 1997 | |
| Hemimysis anomala | Ireland | 2007 | |
| Hemimysis anomala | Lithuania | 1962 | |
| Hemimysis anomala | Netherlands | 1997 | |
| Hemimysis anomala | Poland | 2002 | |
| Hemimysis anomala | Russia / Baltic Sea / Kaliningrad area | 1962 | |
| Hemimysis anomala | Russia / Baltic Sea / St. Petersburg area | 1992 | |
| Hemimysis anomala | Sweden / Baltic Sea | 1995 | |
| Hemiramphus far | Greece / Eastern Mediterranean | 1943 | |
| Hemiramphus far | Israel | 1925 | |
| Hemiramphus far | Italy / Central Mediterranean | 2013 | |
| Heniochus acuminatus | Ukraine / Black Sea | From 2003 | |
| Heniochus intermedius | Israel | 2014 | |
| Herdmania momus | Greece / Eastern Mediterranean | 2010 | |
| Herdmania momus | Israel | 1955 | |
| Herklotsichthys punctatus | Israel | 1943 | |
| Herposiphonia parca | France / Biscay Gulf | 2005 | |
| Herposiphonia parca | France / Western Mediterranean | 1997 | |
| Herposiphonia parca | Israel | 2015 | |
| Herrmannella duggani | France / Biscay Gulf | 1955 | |
| Herrmannella duggani | Ireland | 1982 | |
| Hesionides arenaria | Ukraine / Black Sea | 1960 - 1969 | |
| Hesionura serrata | Italy / Adriatic Sea | 2010 | |
| Hesperibalanus fallax | France / Biscay Gulf | 2008 | |
| Hesperibalanus fallax | France / English Channel | 1976 | |
| Hesperibalanus fallax | Portugal / Iberian Coastal | 2015 | |
| Hesperibalanus fallax | United Kingdom (Britain) / Celtic seas | 1994 | |
| Hesperibalanus fallax | United Kingdom (Britain) / English Channel | 1994 | |
| Heterolaophonte hamondi | Ireland | 1986 | |
| Heterosaccus dollfusi | Israel | 1992 | |
| Heterosigma akashiwo | Denmark / Baltic Sea | 1989 | |
| Heterosigma akashiwo | Denmark / North Sea | 1989 | |
| Heterosigma akashiwo | France / Biscay Gulf | 1990 | |
| Heterosigma akashiwo | France / English Channel | 1993 | |
| Heterosigma akashiwo | France / Western Mediterranean | 1996 | |
| Heterosigma akashiwo | Germany / Baltic Sea | To 2012 | |
| Heterosigma akashiwo | Germany / North Sea | To 1993 | |
| Heterosigma akashiwo | Iceland | 1987 | |
| Heterosigma akashiwo | Ireland | 1970 - 1976 | |
| Heterosigma akashiwo | Netherlands | To 1992 | |
| Heterosigma akashiwo | Norway / North Sea | 1964 | |
| Heterosigma akashiwo | United Kingdom (Britain) / English Channel | 1950 | |
| Heterosigma carterae | Norway / North Sea | To 1979 | |
| Heterostegina depressa | Greece / Eastern Mediterranean | 1980 - 1988 | |
| Heterostigma sp. | Canada / Hudson Bay Complex | To 2012 | |
| Hexaplex trunculus | France / Biscay Gulf | 1996 | |
| Hexaplex trunculus | France / Celtic seas | 1996 | |
| Hexaplex trunculus | Netherlands | To 2007 | |
| Hexaplex trunculus | Portugal / Azores | To 1919 | |
| Hexaplex trunculus | Portugal / Madeira | To 1994 | |
| Hexaplex trunculus | Spain / Iberian Coastal | 2005 | |
| Hiatella arctica | Portugal / Azores | To 1969 | |
| Hildenbrandia crouaniorum | Bulgaria | 2000 - 2009 | |
| Hildenbrandia occidentalis | Australia / Bass strait | 1981 | |
| Hildenbrandia occidentalis | France / English Channel | 2011 | |
| Hildenbrandia rubra | Australia / Bass strait | 1981 | |
| Hillea fusiformis | Georgia | 2000 | |
| Hillea fusiformis | Romania | 1991 | |
| Hillea fusiformis | Russia / Black Sea | 2001 | |
| Hillea fusiformis | Ukraine / Black Sea | From 1948 | |
| Himantura uarnak | Israel | 1954 | |
| Hincksia granulosa | Australia / Bass strait | 1971 | |
| Hincksia ovata | Australia / Bass strait | 1971 | |
| Hincksia sandriana | Australia / Bass strait | 1971 | |
| Hippocampus kuda | Israel | 1994 | |
| Hippopodina iririkiensis | Israel | 1966 | |
| Hippothoa divaricata | Australia / Bass strait | 1971 | |
| Hobaniella longicruris | Netherlands | To 2009 | |
| Holocentrus adscensionis | France / Western Mediterranean | 2019 | |
| Homarus americanus | Denmark / Baltic Sea | 2006 | |
| Homarus americanus | Denmark / North Sea | 2006 | |
| Homarus americanus | France / Biscay Gulf | 2002 | |
| Homarus americanus | France / Celtic seas | 2002 | |
| Homarus americanus | France / English Channel | To 2005 | |
| Homarus americanus | Germany / Baltic Sea | 2014 | |
| Homarus americanus | Iceland | 1965 | |
| Homarus americanus | Ireland | 1961 | |
| Homarus americanus | Netherlands | 2010 | |
| Homarus americanus | Norway / North Sea | 1999 | |
| Homarus americanus | Norway / Norwegian Sea | To 2012 | |
| Homarus americanus | Sweden / North Sea | 2008 | |
| Homarus americanus | United Kingdom (Britain) / North Sea | 2004 | |
| Huso huso | Denmark / Baltic Sea | 2010 | |
| Huso huso | Estonia | 1962 | |
| Huso huso | Latvia | 1962 | |
| Hyastenus hilgendorfi | Israel | 1960 | |
| Hydroides brachyacantha | Greece / Eastern Mediterranean | 2015 | |
| Hydroides brachyacantha | Israel | 1933 | |
| Hydroides dianthus | France / Biscay Gulf | 1927 | |
| Hydroides dianthus | France / Celtic seas | 1927 | |
| Hydroides dianthus | France / North Sea | 2000 | |
| Hydroides dianthus | France / Western Mediterranean | 1967 | |
| Hydroides dianthus | Italy / Adriatic Sea | 1874 | |
| Hydroides dianthus | Italy / Central Mediterranean | To 1899 | |
| Hydroides dianthus | Italy / Western Mediterranean | 1865 | |
| Hydroides dianthus | Ukraine / Black Sea | 2009 | |
| Hydroides dianthus | United Kingdom (Britain) / English Channel | 1970 | |
| Hydroides dirampha | France / Western Mediterranean | 2019 | |
| Hydroides dirampha | Greece / Central Mediterranean | 1981 | |
| Hydroides dirampha | Greece / Eastern Mediterranean | 2014 | |
| Hydroides dirampha | Israel | 1937 | |
| Hydroides dirampha | Italy / Adriatic Sea | 2014 | |
| Hydroides dirampha | Italy / Central Mediterranean | 1979 | |
| Hydroides dirampha | Italy / Western Mediterranean | 1870 | |
| Hydroides elegans | France / Western Mediterranean | To 1944 | |
| Hydroides elegans | Greece / Central Mediterranean | 2012 | |
| Hydroides elegans | Greece / Eastern Mediterranean | 1976 | |
| Hydroides elegans | Israel | 1955 | |
| Hydroides elegans | Italy / Adriatic Sea | 1934 - 1938 | |
| Hydroides elegans | Italy / Central Mediterranean | 1964 | |
| Hydroides elegans | Italy / Western Mediterranean | To 1850 | |
| Hydroides elegans | Netherlands | 1973 | |
| Hydroides elegans | Portugal / Azores | To 2000 | |
| Hydroides elegans | United Kingdom (Britain) / English Channel | 1937 | |
| Hydroides ezoensis | France / Biscay Gulf | 1968 | |
| Hydroides ezoensis | France / Celtic seas | 1974 | |
| Hydroides ezoensis | France / English Channel | 1973 | |
| Hydroides ezoensis | United Kingdom (Britain) / English Channel | To 1976 | |
| Hydroides heterocera | Israel | 1937 | |
| Hydroides homoceros | Israel | 1955 | |
| Hydroides minax | Israel | 1990 | |
| Hydroides norvegica | Australia / Bass strait | 1975 | |
| Hydroides operculata | Israel | 1959 | |
| Hymeniacidon perlevis | Netherlands | To 1951 | |
| Hymeniacidon sinapium | USA / California Current | 2012 | |
| Hypania invalida | Belgium | To 2000 | |
| Hypania invalida | Germany / Baltic Sea | 2010 | |
| Hypania invalida | Germany / North Sea | 1995 | |
| Hypania invalida | Poland | 2010 | |
| Hypanis glabra | Ukraine / Black Sea | From 2004 | |
| Hypereteone heteropoda | Denmark / North Sea | To 2017 | |
| Hypereteone lighti | Germany / North Sea | 2021 | |
| Hypleurochilus bermudensis | Denmark / Baltic Sea | 1934 | |
| Hypnea anastomosans | Greece / Eastern Mediterranean | 2008 | |
| Hypnea anastomosans | Israel | 1972 | |
| Hypnea cervicornis | Italy / Adriatic Sea | 2009 | |
| Hypnea cornuta | Greece / Eastern Mediterranean | 1894 | |
| Hypnea cornuta | Israel | 1945 | |
| Hypnea cornuta | Italy / Central Mediterranean | 2000 | |
| Hypnea flagelliformis | Portugal / Azores | 2005 - 2007 | |
| Hypnea musciformis | France / Biscay Gulf | 1896 | |
| Hypnea musciformis | France / English Channel | 1896 | |
| Hypnea musciformis | France / North Sea | 2005 | |
| Hypnea musciformis | Portugal / Azores | 1929 | |
| Hypnea spinella | France / Western Mediterranean | To 2005 | |
| Hypnea spinella | Greece / Central Mediterranean | 2013 | |
| Hypnea spinella | Greece / Eastern Mediterranean | 1979 | |
| Hypnea spinella | Italy / Adriatic Sea | 2010 | |
| Hypnea spinella | Italy / Central Mediterranean | 1985 | |
| Hypnea spinella | Italy / Western Mediterranean | 1989 - 1990 | |
| Hypnea valentiae | France / Biscay Gulf | 2005 | |
| Hypnea valentiae | France / Western Mediterranean | 1993 | |
| Hypnea valentiae | Greece / Eastern Mediterranean | 2009 | |
| Hypoglossum caloglossoides | Israel | 2013 | |
| Hypophthalmichthys molitrix | Belgium | To 1988 | |
| Hypophthalmichthys molitrix | Germany / North Sea | To 1998 | |
| Hypophthalmichthys molitrix | Latvia | 1960 | |
| Hypophthalmichthys molitrix | Netherlands | To 1998 | |
| Hypophthalmichthys molitrix | Poland | 1964 | |
| Hypophthalmichthys molitrix | Russia / Baltic Sea / Kaliningrad area | 1958 | |
| Hypophthalmichthys nobilis | Denmark / Baltic Sea | 1987 | |
| Hypophthalmichthys nobilis | Estonia | 2002 | |
| Hypophthalmichthys nobilis | Latvia | 2002 | |
| Hypselodoris infucata | Greece / Eastern Mediterranean | 2007 | |
| Hypselodoris infucata | Israel | 1965 | |
| Ianiropsis serricaudis | France / Biscay Gulf | 2013 | |
| Ianiropsis serricaudis | France / English Channel | 2019 | |
| Ianiropsis serricaudis | France / Western Mediterranean | From 2015 | |
| Ianiropsis serricaudis | Germany / North Sea | 2022 | |
| Ianiropsis serricaudis | Italy / Adriatic Sea | 2012 | |
| Ianiropsis serricaudis | Italy / Western Mediterranean | 2014 | |
| Ianiropsis serricaudis | Netherlands | 2000 | |
| Ianiropsis serricaudis | United Kingdom (Britain) / English Channel | 2004 | |
| Ictalurus punctatus | Estonia | 2001 | |
| Idyella pallidula | Ukraine / Black Sea | From 1964 | |
| Imogine necopinata | Netherlands | To 2005 | |
| Incisocalliope aestuarius | Belgium | To 1991 | |
| Incisocalliope aestuarius | France / Biscay Gulf | 2015 | |
| Incisocalliope aestuarius | Germany / North Sea | To 2016 | |
| Incisocalliope aestuarius | Netherlands | 1991 | |
| Indothais lacera | Israel | 1928 | |
| Indothais lacera | Italy / Western Mediterranean | 1983 | |
| Indothais sacellum | Israel | 2004 | |
| Iphigenella shablensis | Russia / Caspian Sea | 1969 | |
| Iphione muricata | Israel | 2015 | |
| Iridaea sp | Ireland | 1972 | |
| Isochrysis spp. | Ireland | 1970 - 1979 | |
| Isognomon legumen | Greece / Eastern Mediterranean | 2016 | |
| Isognomon legumen | Israel | 2015 | |
| Isognomon legumen | Italy / Central Mediterranean | 2019 | |
| Isognomon radiatus | Ireland | 1996 | |
| Isolda pulchella | Portugal / Iberian Coastal | To 2017 | |
| Istiblennius meleagris | Israel | 2016 | |
| Ixa monodi | Greece / Eastern Mediterranean | 1999 | |
| Ixa monodi | Israel | 1977 | |
| Jaera (Jaera) istri | Belgium | To 2000 | |
| Jaera (Jaera) istri | Germany / North Sea | 1995 | |
| Jania longifurca | Portugal / Azores | 1986 | |
| Jania longifurca | Turkey / Black Sea | 2000 - 2009 | |
| Janolus hyalinus | Australia / Bass strait | 1986 | |
| Jassa marmorata | Australia / Bass strait | 1997 | |
| Jassa marmorata | Belgium | To 2011 | |
| Jassa marmorata | Denmark / North Sea | 2003 | |
| Jassa marmorata | France / Biscay Gulf | To 1992 | |
| Jassa marmorata | Germany / Baltic Sea | 2010 | |
| Jassa marmorata | Germany / North Sea | 1999 | |
| Jassa marmorata | Ireland | To 1983 | |
| Jassa marmorata | Italy / Adriatic Sea | 1977 - 1981 | |
| Jassa marmorata | Italy / Central Mediterranean | From 1976 | |
| Jassa marmorata | Italy / Western Mediterranean | 1974 | |
| Jassa marmorata | Netherlands | To 2009 | |
| Jassa marmorata | Portugal / Madeira | 1991 | |
| Jassa marmorata | United Kingdom (Britain) / North Sea / Orkney Islands | From 2013 | |
| Jassa slatteryi | Italy / Adriatic Sea | 2000 | |
| Jassa slatteryi | Italy / Central Mediterranean | 1952 | |
| Jassa slatteryi | Italy / Western Mediterranean | 2007 | |
| Jasus lalandii | Portugal / Iberian Coastal | To 1982 | |
| Jaydia queketti | Israel | 2007 | |
| Jaydia smithi | Israel | 2007 | |
| Jellyella tuberculata | Spain / Canary Islands | To 2003 | |
| Joculator problematicus | Israel | 2018 | |
| Kaloplocamus ramosus | Australia / Bass strait | To 1950 | |
| Kapraunia schneideri | Italy / Adriatic Sea | 2016 | |
| Karenia brevisulcata | France / Biscay Gulf | 2009 | |
| Karenia mikimotoi | Denmark / Baltic Sea | 1968 | |
| Karenia mikimotoi | Denmark / North Sea | 1968 | |
| Karenia mikimotoi | France / Biscay Gulf | To 1985 | |
| Karenia mikimotoi | France / Celtic seas | 1976 | |
| Karenia mikimotoi | France / English Channel | 1976 | |
| Karenia mikimotoi | France / North Sea | 1989 | |
| Karenia mikimotoi | France / Western Mediterranean | To 1985 | |
| Karenia mikimotoi | Germany / Baltic Sea | 1981 - 1989 | |
| Karenia mikimotoi | Germany / North Sea | 1968 | |
| Karenia mikimotoi | Greece / Eastern Mediterranean | 1989 | |
| Karenia mikimotoi | Ireland | 1976 | |
| Karenia mikimotoi | Netherlands | 1989 | |
| Karenia mikimotoi | Norway / North Sea | To 1966 | |
| Karenia mikimotoi | Portugal / Iberian Coastal | To 2007 | |
| Karenia mikimotoi | Spain / Iberian Coastal | To 2006 | |
| Karenia mikimotoi | Sweden / Baltic Sea | 1980 - 1987 | |
| Karenia mikimotoi | Sweden / North Sea | 1981 | |
| Karenia mikimotoi | United Kingdom (Britain) / Celtic seas | 1971 | |
| Karenia mikimotoi | United Kingdom (Britain) / English Channel | 1971 | |
| Karenia mikimotoi | United Kingdom (Britain) / North Sea | 2006 | |
| Karenia mikimotoi | United Kingdom (Britain) / North Sea / Orkney Islands | To 2006 | |
| Karenia papilionacea | France / Biscay Gulf | 1994 | |
| Karenia papilionacea | France / Celtic seas | 1994 | |
| Karenia papilionacea | France / English Channel | 1994 | |
| Karenia umbella | France / Biscay Gulf | 2008 | |
| Karenia umbella | France / English Channel | 2008 | |
| Karlodinium decipiens | France / Biscay Gulf | 2009 | |
| Karlodinium decipiens | France / English Channel | 2010 | |
| Karlodinium veneficum | Germany / North Sea | To 2009 | |
| Karlodinium veneficum | Norway / North Sea | To 2002 | |
| Kirchenpaueria halecioides | Portugal / Azores | To 1989 | |
| Kirchenpaueria halecioides | Portugal / Madeira | 1980 | |
| Koinostylochus ostreophagus | France / Biscay Gulf | 1970 - 1979 | |
| Koinostylochus ostreophagus | France / Celtic seas | 1979 | |
| Koinostylochus ostreophagus | France / English Channel | 1970 | |
| Kuckuckia spinosa | Australia / Bass strait | 1971 | |
| Kyphosus sectatrix | France / Western Mediterranean | 2006 | |
| Labyrinthula zosterae | Germany / North Sea | 1935 | |
| Labyrinthula zosterae | Ireland | 1926 - 1934 | |
| Laeospira berkeleyana | France / Western Mediterranean | 1977 | |
| Laeospira berkeleyana | Portugal / Madeira | To 1980 | |
| Laevichlamys superficialis | Israel | 2020 | |
| Lagocephalus guentheri | Greece / Central Mediterranean | 2005 | |
| Lagocephalus guentheri | Greece / Eastern Mediterranean | 1952 | |
| Lagocephalus guentheri | Israel | 1951 | |
| Lagocephalus sceleratus | Greece / Adriatic Sea | 2018 | |
| Lagocephalus sceleratus | Greece / Central Mediterranean | 2009 | |
| Lagocephalus sceleratus | Greece / Eastern Mediterranean | 2005 | |
| Lagocephalus sceleratus | Israel | 2004 | |
| Lagocephalus sceleratus | Italy / Adriatic Sea | 2014 | |
| Lagocephalus sceleratus | Italy / Central Mediterranean | 2013 - 2014 | |
| Lagocephalus sceleratus | Italy / Western Mediterranean | 2014 | |
| Lagocephalus sceleratus | Spain / Iberian Coastal | 2014 | |
| Lagocephalus suezensis | Greece / Eastern Mediterranean | 2003 | |
| Lagocephalus suezensis | Israel | 1987 | |
| Laminaria ochroleuca | Ireland | 2018 | |
| Lamprohaminoea ovalis | France / Western Mediterranean | 2021 | |
| Lamprohaminoea ovalis | Greece / Central Mediterranean | 2001 | |
| Lamprohaminoea ovalis | Greece / Eastern Mediterranean | 2005 | |
| Lamprohaminoea ovalis | Italy / Central Mediterranean | 2007 | |
| Lamprohaminoea ovalis | Italy / Western Mediterranean | 2008 | |
| Laonome calida | Belgium | To 2014 | |
| Laonome calida | Netherlands | 2009 | |
| Laonome sp. | Estonia | 2012 | |
| Laonome sp. | Latvia | 2014 | |
| Laonome sp. | Poland | 2015 | |
| Laonome sp. | Sweden / Baltic Sea | 2014 | |
| Laonome xeprovala sp. nov. | Finland | 2016 | |
| Laonome xeprovala sp. nov. | Germany / Baltic Sea | 2016 | |
| Laonome xeprovala sp. nov. | Germany / North Sea | 2016 | |
| Lateolabrax japonicus | Ukraine / Azov Sea | 1960 - 1979 | |
| Lateolabrax japonicus | Ukraine / Black Sea | 1960 - 1979 | |
| Laternula anatina | Israel | 1958 | |
| Laticorophium baconi | France / Western Mediterranean | 2020 | |
| Latopilumnus malardi | France / English Channel | 1910 | |
| Laurencia brongniartii | France / Celtic seas | 1989 | |
| Laurencia brongniartii | France / English Channel | 1989 | |
| Laurencia brongniartii | Portugal / Azores | 2005 - 2007 | |
| Laurencia caduciramulosa | France / Western Mediterranean | 2002 | |
| Laurencia caduciramulosa | Greece / Central Mediterranean | 2001 | |
| Laurencia caduciramulosa | Greece / Eastern Mediterranean | 2009 | |
| Laurencia caduciramulosa | Israel | 2013 | |
| Laurencia caduciramulosa | Italy / Central Mediterranean | 1991 | |
| Laurencia chondrioides | Greece / Central Mediterranean | 1998 | |
| Laurencia chondrioides | Greece / Eastern Mediterranean | 2006 | |
| Laurencia chondrioides | Portugal / Azores | 2005 - 2007 | |
| Laurencia dendroidea | Portugal / Azores | 2005 - 2007 | |
| Laurencia majuscula | Portugal / Azores | 2005 - 2007 | |
| Laurencia majuscula | Portugal / Madeira | To 2001 | |
| Laurencia minuta | Israel | 2015 | |
| Laurencia okamurae | France / Western Mediterranean | 1984 | |
| Leathesia marina | Australia / Bass strait | 1971 | |
| Leathesia marina | France / Western Mediterranean | 1905 | |
| Leathesia marina | Italy / Adriatic Sea | 1996 | |
| Leathesia marina | Portugal / Azores | 1897 | |
| Lecithochirium magnicaudatum | Israel | 1977 | |
| Leiocapitellides analis | Greece / Eastern Mediterranean | 2000 | |
| Leiochrides australis | Italy / Western Mediterranean | 1990 | |
| Lennoxia faveolata | Germany / Baltic Sea | 2009 | |
| Lennoxia faveolata | Germany / North Sea | 2009 | |
| Lennoxia faveolata | Sweden / Baltic Sea | 2007 | |
| Leonnates decipiens | Israel | 1989 | |
| Leonnates indicus | Israel | 1991 | |
| Leonnates persicus | Greece / Eastern Mediterranean | 2013 | |
| Leonnates persicus | Israel | 1937 | |
| Lepidodinium chlorophorum | Denmark / Baltic Sea | 1999 | |
| Lepidodinium chlorophorum | Denmark / North Sea | 1999 | |
| Lepidonotus tenuisetosus | Greece / Eastern Mediterranean | 2008 | |
| Lepidonotus tenuisetosus | Israel | 1969 | |
| Lepomis gibbosus | Norway / North Sea | To 2004 | |
| Lepomis gibbosus | Poland | 1927 | |
| Lepomis gibbosus | Ukraine / Black Sea | 1949 - 2002 | |
| Leptochela pugnax | Israel | 1947 | |
| Leptomesochra tenuicornis | Russia / Black Sea | 1999 | |
| Leptosiphonia brodiei | Australia / Bass strait | 1959 | |
| Lernanthropus callionymicola | Israel | 2008 | |
| Lessardia elongata | Bulgaria | 2008 | |
| Lessardia elongata | Romania | 2004 | |
| Leucosolenia eleanor | USA / California Current | 2012 | |
| Leucosolenia somesii | Netherlands | To 1996 | |
| Leucotina natalensis | Israel | 1978 | |
| Liagora viscida | Turkey / Black Sea | 2000 - 2009 | |
| Licornia jolloisii | Israel | 1975 | |
| Ligia italica | Portugal / Azores | To 1887 | |
| Ligia oceanica | Portugal / Azores | To 1998 | |
| Ligophorus kaohsianghsieni | Ukraine / Black Sea | 1994 | |
| Ligophorus llewellyni | Ukraine / Black Sea | 2007 | |
| Ligophorus pilengas | Ukraine / Black Sea | 1996 | |
| Limnodrilus cervix | Belgium | To 2009 | |
| Limnodrilus cervix | Poland | 2010 | |
| Limnomysis benedeni | Belgium | To 2005 | |
| Limnomysis benedeni | Germany / Baltic Sea | 2010 | |
| Limnomysis benedeni | Latvia | 1966 | |
| Limnomysis benedeni | Lithuania | 1962 | |
| Limnomysis benedeni | Russia / Baltic Sea / Kaliningrad area | 1962 | |
| Limnoria lignorum | France / English Channel | To 1868 | |
| Limnoria lignorum | Netherlands | 1885 - 1886 | |
| Limnoria quadripunctata | France / Biscay Gulf | 1968 | |
| Limnoria quadripunctata | France / English Channel | 1998 | |
| Limnoria quadripunctata | France / Western Mediterranean | 2014 | |
| Limnoria quadripunctata | Ireland | 1959 | |
| Limnoria quadripunctata | Netherlands | To 1949 | |
| Limnoria quadripunctata | Portugal / Iberian Coastal | To 1995 | |
| Limnoria quadripunctata | United Kingdom (Britain) / Celtic seas | 1930 - 1939 | |
| Limnoria quadripunctata | United Kingdom (Britain) / English Channel | 1930 - 1939 | |
| Limnoria tripunctata | France / Biscay Gulf | 1968 | |
| Limnoria tripunctata | Portugal / Iberian Coastal | 1960 - 1979 | |
| Limnoria tripunctata | United Kingdom (Britain) / Celtic seas | 1950 - 1959 | |
| Limnoria tripunctata | United Kingdom (Britain) / English Channel | 1950 - 1959 | |
| Limulus polyphemus | Denmark / Baltic Sea | 1968 | |
| Limulus polyphemus | Denmark / North Sea | 1968 | |
| Limulus polyphemus | Germany / North Sea | 1866 | |
| Limulus polyphemus | Netherlands | 1873 | |
| Limulus polyphemus | Sweden / North Sea | | |
| Linguimaera caesaris | Israel | 1952 | |
| Linguimaera caesaris | Italy / Central Mediterranean | 2019 | |
| Linopherus canariensis | Greece / Eastern Mediterranean | 2007 | |
| Linopherus canariensis | Israel | 1972 | |
| Linopherus canariensis | Italy / Central Mediterranean | 2008 | |
| Linopherus canariensis | Italy / Western Mediterranean | 2008 | |
| Lioberus ligneus | Israel | 2020 | |
| Lioloma pacificum | Bulgaria | 2008 | |
| Lioloma pacificum | Georgia | 2007 | |
| Lioloma pacificum | Romania | 2001 | |
| Lioloma pacificum | Russia / Black Sea | 2005 | |
| Lioloma pacificum | Ukraine / Black Sea | From 1999 | |
| Lissodendoryx isodictyalis | Australia / Bass strait | 1882 | |
| Lithoglyphus naticoides | Belgium | To 1924 | |
| Lithoglyphus naticoides | Germany / Baltic Sea | To 1883 | |
| Lithoglyphus naticoides | Poland | 1873 | |
| Lithoglyphus naticoides | Russia / Baltic Sea / Kaliningrad area | 1801 - 1899 | |
| Lithognathus mormyrus | Portugal / Madeira | 1967 | |
| Lithognathus mormyrus | Romania | From 1980 | |
| Lithognathus mormyrus | Ukraine / Black Sea | 2013 | |
| Lithophyllum orbiculatum | Turkey / Black Sea | 2000 - 2009 | |
| Lithophyllum yessoense | France / Western Mediterranean | 1993 | |
| Litopenaeus stylirostris | China / Yellow Sea | To 2002 | |
| Litopenaeus vannamei | China / Yellow Sea | To 2005 | |
| Litosiphon laminariae | United Kingdom (Britain) / English Channel | 1900 | |
| Littorina saxatilis | Italy / Adriatic Sea | To 1792 | |
| Livoneca redmanii | Spain / Iberian Coastal | To 2016 | |
| Liza aurata | Russia / Caspian Sea | 1930 - 1934 | |
| Liza carinata | Israel | 1970 | |
| Liza saliens | Russia / Caspian Sea | 1930 - 1935 | |
| Lobophora lessepsiana | Israel | 1960 | |
| Lobophora schneideri | Israel | 2016 | |
| Loimia medusa | France / Biscay Gulf | 2003 | |
| Loimia medusa | France / English Channel | 2000 | |
| Lomentaria flaccida | France / Western Mediterranean | 2002 | |
| Lomentaria hakodatensis | France / Biscay Gulf | 2005 | |
| Lomentaria hakodatensis | France / Celtic seas | 1984 | |
| Lomentaria hakodatensis | France / English Channel | 1984 | |
| Lomentaria hakodatensis | France / Western Mediterranean | 1979 | |
| Lomentaria hakodatensis | Italy / Adriatic Sea | 2000 | |
| Lomentaria hakodatensis | Netherlands | 2004 | |
| Lomentaria hakodatensis | Portugal / Iberian Coastal | From 2008 | |
| Lomentaria hakodatensis | Spain / Iberian Coastal | 1992 | |
| Lophocladia lallemandii | France / Western Mediterranean | 2021 | |
| Lophocladia lallemandii | Greece / Central Mediterranean | 1975 | |
| Lophocladia lallemandii | Greece / Eastern Mediterranean | 1908 | |
| Lophocladia lallemandii | Israel | 1953 | |
| Lophocladia lallemandii | Italy / Adriatic Sea | To 1978 | |
| Lophocladia lallemandii | Italy / Central Mediterranean | 1969 | |
| Lophocladia lallemandii | Italy / Western Mediterranean | 1971 | |
| Lovenella assimilis | Belgium | To 2012 | |
| Lovenella assimilis | France / English Channel | To 2007 | |
| Loxomitra kefersteinii | United Kingdom (Britain) / Celtic seas | 1950 | |
| Loxosomella antedonis | United Kingdom (Britain) / Celtic seas | 1950 - 1959 | |
| Ludwigia grandiflora (Michx.) | Germany / North Sea | 2009 | |
| Lulwoana uniseptata | Ukraine / Black Sea | From 2001 | |
| Lumbrinerides acutiformis | Italy / Central Mediterranean | 1995 | |
| Lumbrinerides neogesae | Greece / Central Mediterranean | 2002 | |
| Lumbrinerides neogesae | Italy / Adriatic Sea | 1991 | |
| Lumbrinerides neogesae | Italy / Western Mediterranean | 1991 | |
| Lumbrineris crassicephala | Portugal / Iberian Coastal | To 2017 | |
| Lumbrineris zatsepini | Canada / Hudson Bay Complex | To 2012 | |
| Lutjanus argentimaculatus | Greece / Eastern Mediterranean | 2019 | |
| Lutjanus argentimaculatus | Israel | 2018 | |
| Lutjanus sebae | Greece / Eastern Mediterranean | 2010 | |
| Lutjanus sebae | Italy / Western Mediterranean | 2016 | |
| Lychaete herpestica | Israel | 1955 | |
| Lymnaea sp. | United Kingdom (Britain) / Celtic seas / Channel Islands | | |
| Lyrodus pedicellatus | France / Biscay Gulf | 2009 | |
| Lyrodus pedicellatus | France / Western Mediterranean | 2014 | |
| Lyrodus pedicellatus | Greece / Eastern Mediterranean | 1940 | |
| Lyrodus pedicellatus | Portugal / Azores | To 1940 | |
| Lyrodus pedicellatus | Portugal / Iberian Coastal | To 2002 | |
| Lyrodus pedicellatus | Portugal / Madeira | To 1940 | |
| Lyrodus pedicellatus | United Kingdom (Britain) / English Channel | 1938 | |
| Lysidice collaris | France / Western Mediterranean | 2022 | |
| Lysidice collaris | Greece / Central Mediterranean | 2000 | |
| Lysidice collaris | Greece / Eastern Mediterranean | 1975 | |
| Lysidice collaris | Israel | 1970 | |
| Lysidice collaris | Italy / Central Mediterranean | 1961 | |
| Lysidice collaris | Italy / Western Mediterranean | To 2007 | |
| Macrobrachium rosenbergii | Ukraine / Azov Sea | 1980 - 1990 | |
| Macrobrachium rosenbergii | Ukraine / Black Sea | 1980 - 1990 | |
| Macrocystis pyrifera | France / Celtic seas | 1972 | |
| Macrocystis pyrifera | France / English Channel | 1972 | |
| Macromedaeus voeltzkowi | France / Celtic seas | 1910 | |
| Macromedaeus voeltzkowi | France / English Channel | 1910 | |
| Macrophthalmus (Macrophthalmus) indicus | Greece / Eastern Mediterranean | 2009 | |
| Macrophthalmus (Macrophthalmus) indicus | Israel | 2002 | |
| Macrorhynchia philippina | Israel | 2004 | |
| Macrorhynchia philippina | Portugal / Madeira | 1993 | |
| Mactra lilacea | Israel | 2001 | |
| Mactra olorina | Israel | 1973 | |
| Maeotias marginata | Estonia | 1999 | |
| Maeotias marginata | Finland | 2012 | |
| Maeotias marginata | France / Biscay Gulf | 1971 | |
| Maeotias marginata | France / Celtic seas | 1971 | |
| Maeotias marginata | Portugal / Azores | To 2002 | |
| Maeotias marginata | Portugal / Iberian Coastal | 2009 | |
| Magallana angulata | France / Biscay Gulf | 1866 | |
| Magallana angulata | Germany / North Sea | 1913 | |
| Magallana angulata | Netherlands | To 1928 | |
| Magallana gigas | Australia / Bass strait | 1955 | |
| Magallana gigas | Belgium | 1960 - 1969 | |
| Magallana gigas | China / Yellow Sea | To 2004 | |
| Magallana gigas | Denmark / Baltic Sea | 1972 | |
| Magallana gigas | Denmark / North Sea | 1972 | |
| Magallana gigas | France / Biscay Gulf | 1868 | |
| Magallana gigas | France / Celtic seas | 1866 | |
| Magallana gigas | France / English Channel | 1970 | |
| Magallana gigas | France / Western Mediterranean | 1962 | |
| Magallana gigas | Germany / Baltic Sea | 1970 - 1979 | |
| Magallana gigas | Germany / North Sea | 1984 | |
| Magallana gigas | Ireland | 1877 | |
| Magallana gigas | Italy / Adriatic Sea | 1964 | |
| Magallana gigas | Italy / Central Mediterranean | To 1968 | |
| Magallana gigas | Italy / Western Mediterranean | To 1936 | |
| Magallana gigas | Netherlands | 1965 | |
| Magallana gigas | Norway / North Sea | 2005 | |
| Magallana gigas | Portugal / Iberian Coastal | To 1700 | |
| Magallana gigas | Romania | 2003 | |
| Magallana gigas | Spain / Iberian Coastal | 1801 - 1900 | |
| Magallana gigas | Sweden / North Sea | 2007 | |
| Magallana gigas | Ukraine / Black Sea | 1900 - 1909 | |
| Magallana gigas | United Kingdom (Britain) / Celtic seas | 1965 | |
| Magallana gigas | United Kingdom (Britain) / English Channel | 1965 | |
| Magallana gigas | United Kingdom (Britain) / North Sea | 1926 | |
| Magallana gigas | United Kingdom (Britain) / North Sea / Orkney Islands | To 1991 | |
| Magelona mirabilis | Ukraine / Black Sea | From 1997 | |
| Malleus regula | Greece / Eastern Mediterranean | 1990 - 1996 | |
| Malleus regula | Israel | 1937 | |
| Malleus regula | Italy / Central Mediterranean | 2018 | |
| Mantoniella squamata | Romania | 1980 - 1989 | |
| Marenzelleria arctia | Russia / Baltic Sea / St. Petersburg area | 2009 | |
| Marenzelleria arctia | Sweden / Baltic Sea | 2004 | |
| Marenzelleria neglecta | Belgium | To 2008 | |
| Marenzelleria neglecta | Denmark / Baltic Sea | 2006 | |
| Marenzelleria neglecta | Denmark / North Sea | 2001 | |
| Marenzelleria neglecta | Estonia | 1994 | |
| Marenzelleria neglecta | Finland | 1990 | |
| Marenzelleria neglecta | Germany / Baltic Sea | 1985 | |
| Marenzelleria neglecta | Germany / North Sea | 1997 | |
| Marenzelleria neglecta | Latvia | 1988 | |
| Marenzelleria neglecta | Lithuania | 1988 | |
| Marenzelleria neglecta | Netherlands | To 2001 | |
| Marenzelleria neglecta | Poland | 1986 | |
| Marenzelleria neglecta | Russia / Baltic Sea / Kaliningrad area | 1988 | |
| Marenzelleria neglecta | Russia / Baltic Sea / St. Petersburg area | 1996 | |
| Marenzelleria neglecta | Sweden / Baltic Sea | 1990 | |
| Marenzelleria neglecta | Sweden / North Sea | | |
| Marenzelleria viridis | Belgium | 1996 | |
| Marenzelleria viridis | Denmark / Baltic Sea | 1997 | |
| Marenzelleria viridis | Denmark / North Sea | 1990 | |
| Marenzelleria viridis | France / English Channel | 2009 | |
| Marenzelleria viridis | France / North Sea | 2009 | |
| Marenzelleria viridis | Germany / Baltic Sea | 1985 | |
| Marenzelleria viridis | Germany / North Sea | 1983 | |
| Marenzelleria viridis | Ireland | 2011 | |
| Marenzelleria viridis | Lithuania | 2010 - 2013 | |
| Marenzelleria viridis | Netherlands | 1983 | |
| Marenzelleria viridis | Norway / North Sea | To 1997 | |
| Marenzelleria viridis | Sweden / Baltic Sea | 1996 - 2005 | |
| Marenzelleria viridis | Sweden / North Sea | 2002 - 2003 | |
| Marenzelleria viridis | United Kingdom (Britain) / North Sea | 1982 | |
| Marenzelleria wireni | France / English Channel | 2009 | |
| Marenzelleria wireni | France / North Sea | 2009 | |
| Maritigrella fuscopunctata | Israel | 2013 | |
| Marivagia stellata | Israel | 2006 | |
| Marphysa sanguinea | Belgium | To 2010 | |
| Marphysa sanguinea | France / Biscay Gulf | To 2010 | |
| Marphysa sanguinea | Netherlands | 1990 | |
| Marphysa victori | France / Biscay Gulf | From 1970 | |
| Marteilia refringens | France / Celtic seas | 1968 | |
| Marteilia refringens | France / English Channel | To 2004 | |
| Marteilia refringens | Greece / Eastern Mediterranean | 1997 | |
| Marteilia refringens | Netherlands | 1974 | |
| Marteilia refringens | Spain / Iberian Coastal | To 1975 | |
| Marteilia refringens | Sweden / North Sea | 2009 | |
| Martesia striata | Ireland | 1860 | |
| Mastocarpus stellatus | Portugal / Azores | 1987 | |
| Matuta victor | Greece / Eastern Mediterranean | 2018 | |
| Matuta victor | Israel | 2012 | |
| Mawia benovici | Italy / Adriatic Sea | 2013 | |
| Medeiothamnion lyallii | Australia / Bass strait | 1962 | |
| Mediomastus capensis | Italy / Western Mediterranean | 1985 | |
| Mediopyxis helysia | Germany / North Sea | 2003 | |
| Mediopyxis helysia | Iceland | 2007 | |
| Mediopyxis helysia | Netherlands | To 2010 | |
| Megabalanus coccopoma | Belgium | 1997 | |
| Megabalanus coccopoma | France / North Sea | 1851 | |
| Megabalanus coccopoma | Netherlands | 1976 | |
| Megabalanus tintinnabulum | Belgium | 1998 | |
| Megabalanus tintinnabulum | France / Biscay Gulf | 1970 | |
| Megabalanus tintinnabulum | France / Celtic seas | | |
| Megabalanus tintinnabulum | France / English Channel | 2007 | |
| Megabalanus tintinnabulum | France / North Sea | 2007 | |
| Megabalanus tintinnabulum | Greece / Eastern Mediterranean | 2010 | |
| Megabalanus tintinnabulum | Ireland | 1830 - 1843 | |
| Megabalanus tintinnabulum | Netherlands | 1764 | |
| Megabalanus tintinnabulum | Portugal / Iberian Coastal | 2016 | |
| Megabalanus tulipiformis | France / Biscay Gulf | 1956 | |
| Melanella orientalis | Israel | 2018 | |
| Melanothamnus harveyi | Belgium | To 2000 | |
| Melanothamnus harveyi | Denmark / Baltic Sea | To 1982 | |
| Melanothamnus harveyi | Denmark / North Sea | 1986 | |
| Melanothamnus harveyi | France / Biscay Gulf | 1975 | |
| Melanothamnus harveyi | France / Celtic seas | 1832 | |
| Melanothamnus harveyi | France / English Channel | 1832 | |
| Melanothamnus harveyi | France / Western Mediterranean | 1958 | |
| Melanothamnus harveyi | Germany / Baltic Sea | To 1982 | |
| Melanothamnus harveyi | Germany / North Sea | 1972 | |
| Melanothamnus harveyi | Greece / Eastern Mediterranean | 2006 | |
| Melanothamnus harveyi | Ireland | To 1979 | |
| Melanothamnus harveyi | Israel | 2015 | |
| Melanothamnus harveyi | Italy / Adriatic Sea | 1998 | |
| Melanothamnus harveyi | Italy / Western Mediterranean | To 1969 | |
| Melanothamnus harveyi | Netherlands | 1960 | |
| Melanothamnus harveyi | Norway / North Sea | 1983 | |
| Melanothamnus harveyi | Norway / Norwegian Sea | To 2012 | |
| Melanothamnus harveyi | Portugal / Azores | 2005 - 2007 | |
| Melanothamnus harveyi | Portugal / Iberian Coastal | From 2003 | |
| Melanothamnus harveyi | Spain / Canary Islands | 1991 | |
| Melanothamnus harveyi | Spain / Iberian Coastal | To 1998 | |
| Melanothamnus harveyi | Sweden / North Sea | 1990 | |
| Melanothamnus harveyi | United Kingdom (Britain) / Celtic seas | 1908 | |
| Melanothamnus harveyi | United Kingdom (Britain) / English Channel | 1908 | |
| Melanothamnus harveyi | United Kingdom (Britain) / North Sea | 1908 - 1965 | |
| Melanothamnus harveyi | United Kingdom (Britain) / North Sea / Orkney Islands | 2014 | |
| Melanothamnus japonicus | Italy / Adriatic Sea | 2016 | |
| Melibe viridis | Greece / Central Mediterranean | 1970 | |
| Melibe viridis | Greece / Eastern Mediterranean | 1994 | |
| Melibe viridis | Israel | 2009 | |
| Melibe viridis | Italy / Central Mediterranean | 1984 | |
| Melibe viridis | Italy / Western Mediterranean | 2007 | |
| Melita nitida | Belgium | To 1996 | |
| Melita nitida | France / Biscay Gulf | 2013 | |
| Melita nitida | France / English Channel | 2003 | |
| Melita nitida | France / North Sea | 2003 | |
| Melita nitida | Germany / Baltic Sea | 2010 | |
| Melita nitida | Germany / North Sea | To 2011 | |
| Melita nitida | Netherlands | 1998 | |
| Melita nitida | Poland | 2014 | |
| Melithaea erythraea | Israel | 1999 | |
| Membranipora membranacea | Australia / Bass strait | 1879 | |
| Membranipora membranacea | Canada / Bay of Fundy | 2013 | |
| Membranipora membranacea | Canada / Northern Gulf of St. Lawrence | 2002 | |
| Membranipora membranacea | Canada / Northern Newfoundland | 2008 | |
| Membranipora membranacea | Canada / South-eastern Scotian Shelf | 1992 | |
| Membranipora membranacea | Canada / Southern Gulf of St. Lawrence and Eastern Scotian Shelf | 2006 | |
| Membranipora membranacea | Canada / Southern Newfoundland and Southern Grand Banks | 2006 | |
| Menaethius monoceros | Italy / Western Mediterranean | 1978 | |
| Menippe mercenaria | France / English Channel | 2007 | |
| Mercenaria mercenaria | Belgium | 1933 | |
| Mercenaria mercenaria | France / Biscay Gulf | 1936 - 1939 | |
| Mercenaria mercenaria | France / Celtic seas | 1861 | |
| Mercenaria mercenaria | France / English Channel | 1861 | |
| Mercenaria mercenaria | France / North Sea | 1930 | |
| Mercenaria mercenaria | France / Western Mediterranean | 1965 | |
| Mercenaria mercenaria | Ireland | 1969 | |
| Mercenaria mercenaria | Italy / Adriatic Sea | 1998 | |
| Mercenaria mercenaria | Italy / Western Mediterranean | 1983 | |
| Mercenaria mercenaria | Netherlands | 1933 | |
| Mercenaria mercenaria | Portugal / Iberian Coastal | To 2010 | |
| Mercenaria mercenaria | Spain / Iberian Coastal | To 1978 | |
| Mercenaria mercenaria | United Kingdom (Britain) / English Channel | 1884 | |
| Mercenaria mercenaria | United Kingdom (Britain) / North Sea | 1864 | |
| Mesanthura romulea | Italy / Central Mediterranean | 2000 | |
| Mesanthura romulea | Italy / Western Mediterranean | 2000 | |
| Mesocalanus tenuicornis | Romania | 1978 | |
| Metacalanus acutioperculum | Italy / Central Mediterranean | 1995 | |
| Metacarcinus novaezelandiae | Australia / Bass strait | 1930 | |
| Metapenaeopsis aegyptia | Greece / Eastern Mediterranean | 1996 | |
| Metapenaeopsis aegyptia | Israel | 1987 | |
| Metapenaeopsis mogiensis consobrina | Greece / Eastern Mediterranean | 1995 | |
| Metapenaeopsis mogiensis consobrina | Israel | 1996 | |
| Metapenaeus monoceros | Israel | 1951 | |
| Metapenaeus stebbingi | Israel | 1958 | |
| Metasychis gotoi | France / Biscay Gulf | 2003 | |
| Metaxia bacillum | Israel | 1978 | |
| Micippa thalia | Israel | 2014 | |
| Microcirce consternans | Israel | 2011 | |
| Microcosmus exasperatus | Israel | 2004 | |
| Microcosmus exasperatus | Portugal / Madeira | 1993 | |
| Microcosmus squamiger | France / Western Mediterranean | 1979 | |
| Microcosmus squamiger | Italy / Central Mediterranean | 1977 | |
| Microcosmus squamiger | Italy / Western Mediterranean | 1971 | |
| Microcosmus squamiger | Portugal / Azores | To 2009 | |
| Microcosmus squamiger | Portugal / Iberian Coastal | To 2006 | |
| Microcosmus squamiger | Portugal / Madeira | 2006 | |
| Microcosmus squamiger | Spain / Iberian Coastal | To 2007 | |
| Micromesistius poutassou | Ukraine / Black Sea | From 1999 | |
| Microphthalmus similis | Germany / North Sea | 1962 | |
| Microphthalmus similis | Netherlands | 1962 | |
| Micropogonias undulatus | Belgium | 1998 | |
| Micropogonias undulatus | Denmark / North Sea | 2008 | |
| Micropogonias undulatus | Netherlands | 2003 | |
| Microporella ciliata | Australia / Bass strait | 1879 | |
| Microporella ciliata | Spain / Canary Islands | To 2003 | |
| Microporella coronata | Greece / Eastern Mediterranean | 1967 | |
| Microporella coronata | Italy / Central Mediterranean | 1991 | |
| Microporella harmeri | Israel | 2010 | |
| Micropterus dolomieu | Finland | 1966 | |
| Micropterus dolomieu | Netherlands | To 2017 | |
| Micropterus dolomieu | Sweden / North Sea | 1890 - 1899 | |
| Micropterus salmoides | Finland | 1924 | |
| Micropterus salmoides | France / English Channel | To 2017 | |
| Micropterus salmoides | Germany / North Sea | To 2017 | |
| Micropterus salmoides | Netherlands | To 2005 | |
| Micropterus salmoides | Portugal / Iberian Coastal | To 2017 | |
| Miliolinella fichteliana | Greece / Central Mediterranean | 2006 | |
| Miliolinella fichteliana | Greece / Eastern Mediterranean | 2006 | |
| Millerigobius macrocephalus | Ukraine / Black Sea | 2009 | |
| Mimachlamys sanguinea | Israel | 2011 | |
| Mitrella psilla | Italy / Western Mediterranean | 2016 | |
| Mizuhopecten yessoensis | China / Yellow Sea | To 1980 | |
| Mizuhopecten yessoensis | France / Celtic seas | 1977 - 1981 | |
| Mizuhopecten yessoensis | France / English Channel | 1977 - 1981 | |
| Mizuhopecten yessoensis | Ireland | 1990 | |
| Mnemiopsis leidyi | Belgium | 2007 | |
| Mnemiopsis leidyi | Bulgaria | 1986 | |
| Mnemiopsis leidyi | Denmark / Baltic Sea | 2005 | |
| Mnemiopsis leidyi | Denmark / North Sea | 2005 | |
| Mnemiopsis leidyi | France / Biscay Gulf | 2005 | |
| Mnemiopsis leidyi | France / Celtic seas | 2009 | |
| Mnemiopsis leidyi | France / English Channel | 2005 | |
| Mnemiopsis leidyi | France / North Sea | 2009 | |
| Mnemiopsis leidyi | France / Western Mediterranean | 2004 | |
| Mnemiopsis leidyi | Georgia | 1997 | |
| Mnemiopsis leidyi | Germany / Baltic Sea | 2006 | |
| Mnemiopsis leidyi | Germany / North Sea | 2006 | |
| Mnemiopsis leidyi | Greece / Eastern Mediterranean | 1990 | |
| Mnemiopsis leidyi | Iran / Caspian Sea | From 1995 | |
| Mnemiopsis leidyi | Israel | 2009 | |
| Mnemiopsis leidyi | Italy / Adriatic Sea | 2016 | |
| Mnemiopsis leidyi | Italy / Central Mediterranean | 2009 | |
| Mnemiopsis leidyi | Italy / Western Mediterranean | 2009 | |
| Mnemiopsis leidyi | Netherlands | 1990 - 1999 | |
| Mnemiopsis leidyi | Norway / North Sea | 2005 | |
| Mnemiopsis leidyi | Poland | 2007 | |
| Mnemiopsis leidyi | Romania | From 1989 | |
| Mnemiopsis leidyi | Russia / Baltic Sea / Kaliningrad area | 2007 | |
| Mnemiopsis leidyi | Russia / Black Sea | 1982 | |
| Mnemiopsis leidyi | Sweden / Baltic Sea | 2006 | |
| Mnemiopsis leidyi | Sweden / North Sea | 2006 | |
| Mnemiopsis leidyi | Turkey / Black Sea | From 1991 | |
| Mnemiopsis leidyi | Ukraine / Azov Sea | From 1982 | |
| Mnemiopsis leidyi | Ukraine / Black Sea | From 1982 | |
| Mnestia girardi | Greece / Eastern Mediterranean | 1994 | |
| Mnestia girardi | Israel | 2004 | |
| Modiolus auriculatus | Israel | 1935 | |
| Moerisia inkermanica | Germany / Baltic Sea | 2018 | |
| Moerisia inkermanica | Italy / Western Mediterranean | 1987 | |
| Moerisia inkermanica | Netherlands | 1959 | |
| Molgula manhattensis | Australia / Bass strait | 1967 | |
| Molgula manhattensis | Belgium | To 2018 | |
| Molgula manhattensis | Denmark / Baltic Sea | 1973 | |
| Molgula manhattensis | Denmark / North Sea | 1983 | |
| Molgula manhattensis | France / Celtic seas | 1849 | |
| Molgula manhattensis | France / English Channel | 1840 - 1849 | |
| Molgula manhattensis | France / Western Mediterranean | 1969 | |
| Molgula manhattensis | Germany / North Sea | To 2009 | |
| Molgula manhattensis | Iceland | 2018 | |
| Molgula manhattensis | Ireland | 1998 | |
| Molgula manhattensis | Netherlands | To 1762 | |
| Molgula manhattensis | Norway / Barents Sea | To 1997 | |
| Molgula manhattensis | Norway / North Sea | To 1997 | |
| Molgula manhattensis | Norway / Norwegian Sea | To 1997 | |
| Molgula manhattensis | Portugal / Iberian Coastal | 2002 - 2016 | |
| Molgula manhattensis | Romania | 1901 - 2000 | |
| Molgula manhattensis | Sweden / North Sea | 2002 | |
| Molgula manhattensis | United Kingdom (Britain) / North Sea / Orkney Islands | 1995 | |
| Molgula plana | Portugal / Azores | To 1969 | |
| Molva sp. | Ukraine / Black Sea | 2006 | |
| Monocorophium acherusicum | Australia / Bass strait | 1968 | |
| Monocorophium acherusicum | France / North Sea | 1965 | |
| Monocorophium acherusicum | Ireland | To 2007 | |
| Monocorophium acherusicum | Spain / Iberian Coastal | To 1990 | |
| Monocorophium acherusicum | United Kingdom (Britain) / Celtic seas | 1950 - 1959 | |
| Monocorophium acherusicum | United Kingdom (Britain) / North Sea | 1997 | |
| Monocorophium acherusicum | United Kingdom (Britain) / North Sea / Orkney Islands | To 1997 | |
| Monocorophium insidiosum | Australia / Bass strait | 1996 | |
| Monocorophium insidiosum | Ireland | 2002 | |
| Monocorophium insidiosum | United Kingdom (Britain) / North Sea | 1997 | |
| Monocorophium insidiosum | United Kingdom (Britain) / North Sea / Orkney Islands | To 1997 | |
| Monocorophium sextonae | Australia / Bass strait | 1995 | |
| Monocorophium sextonae | Belgium | To 2000 | |
| Monocorophium sextonae | France / Biscay Gulf | 1936 | |
| Monocorophium sextonae | France / Celtic seas | 1936 | |
| Monocorophium sextonae | France / English Channel | 1936 | |
| Monocorophium sextonae | France / North Sea | 1976 | |
| Monocorophium sextonae | Germany / North Sea | 1997 | |
| Monocorophium sextonae | Ireland | 1982 | |
| Monocorophium sextonae | Netherlands | 1952 | |
| Monocorophium sextonae | Norway / North Sea | 1985 | |
| Monocorophium sextonae | Spain / Iberian Coastal | To 2003 | |
| Monocorophium sextonae | United Kingdom (Britain) / Celtic seas | 1930 | |
| Monocorophium sextonae | United Kingdom (Britain) / English Channel | 1930 - 1939 | |
| Monocorophium sextonae | United Kingdom (Britain) / North Sea | To 2005 | |
| Monocorophium uenoi | France / Biscay Gulf | 2007 | |
| Monocorophium uenoi | Germany / North Sea | 2016 | |
| Monocorophium uenoi | Netherlands | 2013 | |
| Monodacna colorata | Russia / Caspian Sea | 1955 | |
| Monophorus perversus | Spain / Iberian Coastal | To 1996 | |
| Monopylephorus limosus | Belgium | To 2002 | |
| Monosporus indicus | Israel | 2015 | |
| Monotygma lauta | Israel | 1967 | |
| Monotygma watsoni | Israel | 2011 | |
| Monstrilla grandis | Bulgaria | 1912 | |
| Monstrilla grandis | Romania | 1961 | |
| Monstrilla helgolandica | Romania | 1961 | |
| Monstrilla longicornis | Romania | 1961 | |
| Morone saxatilis | Georgia | 1965 | |
| Morone saxatilis | Netherlands | To 1998 | |
| Morone saxatilis | Ukraine / Black Sea | From 1965 | |
| Morula aspera | Israel | 2015 | |
| Muceddina multispinosa | Ireland | 1982 | |
| Mucropetraliella thenardii | Israel | 2016 | |
| Mugil soiuy | Bulgaria | 1970 - 1979 | |
| Mugil soiuy | Georgia | 1975 | |
| Mugil soiuy | Romania | From 1975 | |
| Mugil soiuy | Russia / Black Sea | 1970 - 1979 | |
| Mugil soiuy | Turkey / Black Sea | 1992 | |
| Mugil soiuy | Ukraine / Black Sea | 1968 | |
| Mulinia lateralis | Germany / North Sea | 2017 | |
| Mulinia lateralis | Netherlands | 2018 | |
| Muraenesox cinereus | Israel | 1979 | |
| Murchisonella mediterranea | Greece / Eastern Mediterranean | 2008 - 2011 | |
| Murchisonella sp. | Estonia | 2021 | |
| Murchisonella sp. | Finland | 2013 - 2015 | |
| Murex brandardis | Spain / Iberian Coastal | 2007 | |
| Murex forskoehlii | Israel | 1932 | |
| Musculus coenobitus | Israel | 2018 | |
| Mya arenaria | Belgium | To 1700 | |
| Mya arenaria | Bulgaria | 1973 | |
| Mya arenaria | Denmark / Baltic Sea | 1245 - 1290 | |
| Mya arenaria | Denmark / North Sea | 1245 - 1290 | |
| Mya arenaria | Estonia | 1101 - 1200 | |
| Mya arenaria | Finland | 1101 - 1200 | |
| Mya arenaria | France / Biscay Gulf | To 1700 | |
| Mya arenaria | France / Celtic seas | 1700 | |
| Mya arenaria | France / North Sea | To 1700 | |
| Mya arenaria | France / Western Mediterranean | 1976 | |
| Mya arenaria | Germany / Baltic Sea | 1101 - 1200 | |
| Mya arenaria | Germany / North Sea | To 1350 | |
| Mya arenaria | Greece / Eastern Mediterranean | 1984 | |
| Mya arenaria | Iceland | 1958 | |
| Mya arenaria | Ireland | To 1844 | |
| Mya arenaria | Italy / Adriatic Sea | 2008 | |
| Mya arenaria | Latvia | 1101 - 1200 | |
| Mya arenaria | Lithuania | 1101 - 1200 | |
| Mya arenaria | Netherlands | To 1250 | |
| Mya arenaria | Norway / Barents Sea | To 1000 | |
| Mya arenaria | Norway / North Sea | To 1000 | |
| Mya arenaria | Norway / Norwegian Sea | To 1000 | |
| Mya arenaria | Poland | 1101 - 1200 | |
| Mya arenaria | Portugal / Iberian Coastal | To 1250 | |
| Mya arenaria | Romania | From 1967 | |
| Mya arenaria | Russia / Baltic Sea / Kaliningrad area | 1101 - 1200 | |
| Mya arenaria | Spain / Iberian Coastal | To 1250 | |
| Mya arenaria | Sweden / Baltic Sea | 1200 - 1250 | |
| Mya arenaria | Sweden / North Sea | 1200 - 1250 | |
| Mya arenaria | Turkey / Black Sea | From 1993 | |
| Mya arenaria | Ukraine / Azov Sea | From 1966 | |
| Mya arenaria | Ukraine / Black Sea | From 1966 | |
| Mya arenaria | United Kingdom (Britain) / Celtic seas | 1800 - 1899 | |
| Mya arenaria | United Kingdom (Britain) / English Channel | 1800 - 1899 | |
| Mya arenaria | United Kingdom (Britain) / North Sea | To 1880 | |
| Mya arenaria | United Kingdom (Britain) / North Sea / Orkney Islands | To 1938 | |
| Mycale (Carmia) micracanthoxea | Belgium | To 2018 | |
| Mycale (Carmia) micracanthoxea | Netherlands | 1977 | |
| Mycale (Carmia) senegalensis | Portugal / Madeira | 2010 | |
| Mycale macginitei | USA / California Current | 2012 | |
| Mycteroperca fusca | Israel | 2010 | |
| Myicola ostreae | France / Biscay Gulf | 1972 | |
| Myicola ostreae | France / Celtic seas | 1972 | |
| Myicola ostreae | France / Western Mediterranean | 1972 | |
| Myicola ostreae | Ireland | 1993 | |
| Myicola ostreae | Netherlands | 1992 | |
| Myra subgranulata | Greece / Eastern Mediterranean | 2004 | |
| Myra subgranulata | Israel | 1929 | |
| Myriactula rivulariae | Netherlands | 1980 | |
| Myrianida convoluta | Germany / North Sea | 2021 | |
| Myrionema strangulans | Australia / Bass strait | 1971 | |
| Mytilaster lineatus | Russia / Caspian Sea | 1919 | |
| Mytilaster minimus | Spain / Iberian Coastal | To 2015 | |
| Mytilicola intestinalis | Belgium | 1950 | |
| Mytilicola intestinalis | Denmark / Baltic Sea | 1964 | |
| Mytilicola intestinalis | Denmark / North Sea | 1964 | |
| Mytilicola intestinalis | France / Biscay Gulf | 1949 | |
| Mytilicola intestinalis | France / Celtic seas | 1949 | |
| Mytilicola intestinalis | France / English Channel | 1949 | |
| Mytilicola intestinalis | France / North Sea | 1930 | |
| Mytilicola intestinalis | Germany / North Sea | 1939 | |
| Mytilicola intestinalis | Ireland | 1947 | |
| Mytilicola intestinalis | Netherlands | 1949 | |
| Mytilicola intestinalis | United Kingdom (Britain) / Celtic seas | 1937 | |
| Mytilicola intestinalis | United Kingdom (Britain) / English Channel | 1937 | |
| Mytilicola orientalis | France / Biscay Gulf | 1977 | |
| Mytilicola orientalis | France / Celtic seas | 1977 | |
| Mytilicola orientalis | France / English Channel | 1977 | |
| Mytilicola orientalis | France / North Sea | 1977 | |
| Mytilicola orientalis | France / Western Mediterranean | 1977 | |
| Mytilicola orientalis | Germany / Baltic Sea | 2018 | |
| Mytilicola orientalis | Germany / North Sea | 1990 - 1999 | |
| Mytilicola orientalis | Ireland | 1993 | |
| Mytilicola orientalis | Netherlands | 1949 | |
| Mytilopsis leucophaeata | Belgium | 1835 | |
| Mytilopsis leucophaeata | Estonia | 2019 | |
| Mytilopsis leucophaeata | Finland | 2003 | |
| Mytilopsis leucophaeata | France / Biscay Gulf | 1928 | |
| Mytilopsis leucophaeata | France / English Channel | To 1970 | |
| Mytilopsis leucophaeata | France / North Sea | To 1931 | |
| Mytilopsis leucophaeata | Germany / Baltic Sea | 1928 | |
| Mytilopsis leucophaeata | Germany / North Sea | To 1994 | |
| Mytilopsis leucophaeata | Latvia | 2015 | |
| Mytilopsis leucophaeata | Netherlands | 1895 | |
| Mytilopsis leucophaeata | Poland | 2010 | |
| Mytilopsis leucophaeata | Sweden / Baltic Sea | 2011 | |
| Mytilopsis leucophaeata | Ukraine / Black Sea | From 2000 | |
| Mytilopsis leucophaeata | United Kingdom (Britain) / Celtic seas | 1996 | |
| Mytilopsis leucophaeata | United Kingdom (Britain) / North Sea | To 1999 | |
| Mytilopsis sallei | Israel | 2008 | |
| Mytilopsis sallei | Taiwan / South China Sea | From 1977 | |
| Mytilus edulis | Portugal / Azores | To 1965 | |
| Mytilus edulis | Turkey / Black Sea | 1990 | |
| Mytilus edulis | Ukraine / Black Sea | From 2001 | |
| Mytilus galloprovincialis | France / Biscay Gulf | 2015 - 2017 | |
| Mytilus galloprovincialis | France / Celtic seas | 2015 - 2017 | |
| Mytilus galloprovincialis | France / English Channel | 2003 | |
| Mytilus galloprovincialis | Japan / East China Sea | To 2013 | |
| Mytilus galloprovincialis | Korea, Republic of / Sea of Japan | To 2011 | |
| Mytilus galloprovincialis | Korea, Republic of / Yellow Sea | To 2011 | |
| Mytilus galloprovincialis | Portugal / Madeira | 2009 | |
| Mytilus galloprovincialis | Russia / Sea of Japan | To 1999 | |
| Mytilus galloprovincialis | United Kingdom (Britain) / Celtic seas | 1924 | |
| Mytilus galloprovincialis | United Kingdom (Britain) / English Channel | 1998 | |
| Mytilus trossulus | Spain / Iberian Coastal | To 2016 | |
| Mytilus trossulus | Ukraine / Black Sea | From 2001 | |
| Mytilus trossulus | United Kingdom (Britain) / Celtic seas | 2006 | |
| Myxicola infundibulum | Australia / Bass strait | 1975 | |
| Naineris setosa | Italy / Central Mediterranean | 2019 | |
| Naineris setosa | Italy / Western Mediterranean | 2010 | |
| Nanostrea fluctigera | Israel | 2004 | |
| Naria turdus | Israel | 1980 | |
| Naria turdus | Italy / Central Mediterranean | 2005 | |
| Nassa situla | Israel | 2004 | |
| Nassarius concinnus | Israel | 1968 | |
| Nassarius mutabilis | Spain / Iberian Coastal | 2006 | |
| Nassarius obvelatus | Israel | 1968 | |
| Navicula finmarchica | Bulgaria | 1970 | |
| Navicula finmarchica | Romania | 1970 | |
| Navicula finmarchica | Ukraine / Black Sea | From 1970 | |
| Necora puber | Sweden / North Sea | 2007 | |
| Nemalion elminthoides | Australia / Bass strait | 1971 | |
| Nemalion vermiculare | France / Western Mediterranean | 2005 | |
| Nemipterus randalli | Greece / Eastern Mediterranean | 2018 | |
| Nemipterus randalli | Israel | 2005 | |
| Nemopsis bachei | Belgium | 1996 | |
| Nemopsis bachei | France / Biscay Gulf | 1953 | |
| Nemopsis bachei | France / Celtic seas | 1953 | |
| Nemopsis bachei | France / English Channel | To 1996 | |
| Nemopsis bachei | France / North Sea | 1996 | |
| Nemopsis bachei | Germany / North Sea | 1942 | |
| Nemopsis bachei | Netherlands | 1905 | |
| Nemopsis bachei | Norway / North Sea | To 1879 | |
| Nemopsis bachei | United Kingdom (Britain) / Celtic seas | 1851 | |
| Neocalanus gracilis | Romania | 1978 | |
| Neoceratium candelabrum | France / Celtic seas | 2005 | |
| Neodexiospira brasiliensis | France / Biscay Gulf | 2007 | |
| Neodexiospira brasiliensis | France / English Channel | To 1982 | |
| Neodexiospira brasiliensis | Germany / North Sea | 2014 | |
| Neodexiospira brasiliensis | Netherlands | 1985 | |
| Neodexiospira brasiliensis | United Kingdom (Britain) / English Channel | 1974 | |
| Neogobius fluviatilis | Netherlands | 2009 | |
| Neogobius fluviatilis | Poland | 1997 | |
| Neogobius kessleri | Germany / North Sea | To 2008 | |
| Neogobius kessleri | Netherlands | 2007 | |
| Neogobius melanostomus | Denmark / Baltic Sea | 2008 | |
| Neogobius melanostomus | Denmark / North Sea | 2016 | |
| Neogobius melanostomus | Estonia | 2002 | |
| Neogobius melanostomus | Finland | 2005 | |
| Neogobius melanostomus | Germany / Baltic Sea | 1998 | |
| Neogobius melanostomus | Germany / North Sea | To 2008 | |
| Neogobius melanostomus | Italy / Adriatic Sea | 2012 | |
| Neogobius melanostomus | Latvia | 2004 | |
| Neogobius melanostomus | Lithuania | 2002 | |
| Neogobius melanostomus | Netherlands | 2004 | |
| Neogobius melanostomus | Poland | 1990 | |
| Neogobius melanostomus | Russia / Baltic Sea / Kaliningrad area | 2000 | |
| Neogobius melanostomus | Russia / Baltic Sea / St. Petersburg area | 2012 | |
| Neogobius melanostomus | Sweden / Baltic Sea | 2008 | |
| Neogobius melanostomus | Sweden / North Sea | 2010 | |
| Neomeris annulata | Israel | 2003 | |
| Neomysis americana | Belgium | To 2012 | |
| Neomysis americana | France / English Channel | 2017 | |
| Neomysis americana | Netherlands | To 2010 | |
| Neosiphonia flavimarina | France / Biscay Gulf | 2010 | |
| Neosiphonia flavimarina | France / Celtic seas | 2010 | |
| Neosiphonia flavimarina | France / English Channel | 2010 | |
| Neosiphonia sphaerocarpa | Portugal / Azores | 2005 - 2007 | |
| Neosiphonia sphaerocarpa | Portugal / Madeira | To 2001 | |
| Nephtys ciliata | Ukraine / Black Sea | From 1975 | |
| Neptunea arthritica | Bulgaria | 2000 | |
| Neptunea arthritica | Ukraine / Black Sea | From 2000 | |
| Nereis jacksoni | Italy / Adriatic Sea | To 2016 | |
| Nereis jacksoni | Italy / Western Mediterranean | 1985 | |
| Nereis persica | Israel | 1937 | |
| Nerita sanguinolenta | Greece / Eastern Mediterranean | 1969 | |
| Nerita sanguinolenta | Israel | 2019 | |
| Nikoides sibogae | Israel | 2012 | |
| Nippoleucon hinumensis | Estonia | 2022 | |
| Nippoleucon hinumensis | Finland | 2021 | |
| Nippoleucon hinumensis | Germany / Baltic Sea | 2019 | |
| Nitellopsis obtusa | Ireland | 2016 | |
| Nitidotellina lux | Israel | 1997 | |
| Nitophyllum stellato-corticatum | France / Western Mediterranean | 1988 | |
| Nitzschia sigmoidea | Ukraine / Black Sea | From 1986 | |
| Nonionella stella | Norway / North Sea | 2012 | |
| Notocochlis gualteriana | Israel | 1961 | |
| Notomastus aberans | Greece / Central Mediterranean | 2000 | |
| Notomastus aberans | Greece / Eastern Mediterranean | 1964 | |
| Notomastus aberans | Italy / Adriatic Sea | 1995 | |
| Notomastus aberans | Italy / Western Mediterranean | 1976 - 1977 | |
| Notopus dorsipes | Israel | 1962 | |
| Nototeredo norvagica | Greece / Eastern Mediterranean | 1940 | |
| Nototeredo norvagica | United Kingdom (Britain) / North Sea / Orkney Islands | To 1917 | |
| Novafabricia infratorquata | Italy / Adriatic Sea | 2000 | |
| Novafabricia infratorquata | Italy / Central Mediterranean | 2000 | |
| Novafabricia infratorquata | Italy / Western Mediterranean | To 2014 | |
| Novafabricia infratorquata | Spain / Iberian Coastal | To 2017 | |
| Obelia dichotoma | Australia / Bass strait | 1966 | |
| Obelia dichotoma | Portugal / Madeira | 1980 | |
| Obesogammarus crassus | Germany / Baltic Sea | 1990 - 2015 | |
| Obesogammarus crassus | Germany / North Sea | 2016 | |
| Obesogammarus crassus | Lithuania | 1962 | |
| Obesogammarus crassus | Poland | 1999 | |
| Obesogammarus crassus | Russia / Baltic Sea / Kaliningrad area | 1962 | |
| Ocenebra erinaceus | Netherlands | To 2007 | |
| Ocinebrellus inornatus | Denmark / Baltic Sea | 2006 | |
| Ocinebrellus inornatus | Denmark / North Sea | 2006 | |
| Ocinebrellus inornatus | France / Biscay Gulf | 1993 | |
| Ocinebrellus inornatus | France / English Channel | 1994 | |
| Ocinebrellus inornatus | Netherlands | To 2007 | |
| Ocinebrellus inornatus | Portugal / Iberian Coastal | To 1999 | |
| Octactis octonaria | Bulgaria | 1948 | |
| Octactis octonaria | Romania | 1948 | |
| Octactis octonaria | Ukraine / Black Sea | From 1948 | |
| Octopus cyanea | Israel | 1998 | |
| Oculina patagonica | France / Western Mediterranean | 1972 | |
| Oculina patagonica | Greece / Eastern Mediterranean | 2005 | |
| Oculina patagonica | Italy / Western Mediterranean | 1966 | |
| Odessia maeotica | Russia / Caspian Sea | 1960 | |
| Odetta zekiergeni | Italy / Western Mediterranean | 2019 | |
| Odontella sinensis | Belgium | 1904 | |
| Odontella sinensis | Denmark / Baltic Sea | 1903 | |
| Odontella sinensis | Denmark / North Sea | 1903 | |
| Odontella sinensis | France / Biscay Gulf | To 1934 | |
| Odontella sinensis | France / Celtic seas | 1930 | |
| Odontella sinensis | France / English Channel | To 1930 | |
| Odontella sinensis | France / North Sea | To 1930 | |
| Odontella sinensis | Germany / Baltic Sea | 1904 | |
| Odontella sinensis | Germany / North Sea | 1903 | |
| Odontella sinensis | Ireland | 1995 | |
| Odontella sinensis | Netherlands | 1905 | |
| Odontella sinensis | Norway / North Sea | 1903 | |
| Odontella sinensis | Norway / Norwegian Sea | 1903 | |
| Odontella sinensis | Sweden / North Sea | 1903 | |
| Odontella sinensis | United Kingdom (Britain) / Celtic seas / Channel Islands | | |
| Odontodactylus scyllarus | France / Biscay Gulf | 2009 | |
| Odontodactylus scyllarus | France / English Channel | To 2009 | |
| Odostomia lorioli | Israel | 1974 | |
| Ogyrides mjoebergi | Israel | 1947 | |
| Oithona brevicornis brevicornis | Ukraine / Black Sea | From 2001 | |
| Oithona davisae | Bulgaria | 2009 | |
| Oithona davisae | Denmark / Baltic Sea | 2023 | |
| Oithona davisae | Denmark / North Sea | 2023 | |
| Oithona davisae | Georgia | 2007 | |
| Oithona davisae | Germany / North Sea | 2008 | |
| Oithona davisae | Greece / Eastern Mediterranean | 2018 | |
| Oithona davisae | Italy / Adriatic Sea | 2014 | |
| Oithona davisae | Italy / Central Mediterranean | 2014 | |
| Oithona davisae | Italy / Western Mediterranean | 2014 | |
| Oithona davisae | Romania | 2010 | |
| Oithona davisae | Russia / Black Sea | 2003 | |
| Oithona davisae | Ukraine / Black Sea | 2001 | |
| Oithona plumifera | Ukraine / Black Sea | From 2001 | |
| Oithona setigera | Ukraine / Black Sea | From 2001 | |
| Oithona similis | Russia / Caspian Sea | 2004 | |
| Okenia pellucida | Israel | 2021 | |
| Okenia picoensis | Italy / Central Mediterranean | 2021 | |
| Okenia picoensis | Italy / Western Mediterranean | 2021 | |
| Omobranchus punctatus | Israel | 2003 | |
| Onchocleidus dispar | Norway / North Sea | 2004 | |
| Oncorhynchus clarkii | Sweden / North Sea | | |
| Oncorhynchus gorbuscha | Denmark / Baltic Sea | 1958 | |
| Oncorhynchus gorbuscha | Denmark / North Sea | 1973 | |
| Oncorhynchus gorbuscha | Faroe Islands | 2019 | |
| Oncorhynchus gorbuscha | Finland | 1970 - 1979 | |
| Oncorhynchus gorbuscha | France / English Channel | 2017 | |
| Oncorhynchus gorbuscha | Iceland | 1960 | |
| Oncorhynchus gorbuscha | Ireland | 1973 | |
| Oncorhynchus gorbuscha | Latvia | 1973 | |
| Oncorhynchus gorbuscha | Norway / Barents Sea | 1960 | |
| Oncorhynchus gorbuscha | Norway / Norwegian Sea | 1960 | |
| Oncorhynchus gorbuscha | Russia / Baltic Sea / St. Petersburg area | 1973 - 1980 | |
| Oncorhynchus gorbuscha | Sweden / Baltic Sea | 1974 | |
| Oncorhynchus gorbuscha | Ukraine / Azov Sea | From 1961 | |
| Oncorhynchus gorbuscha | Ukraine / Black Sea | From 1961 | |
| Oncorhynchus gorbuscha | United Kingdom (Britain) / North Sea | 1960 | |
| Oncorhynchus keta | Finland | 1971 | |
| Oncorhynchus keta | Latvia | 1970 | |
| Oncorhynchus keta | Norway / Barents Sea | 1960 | |
| Oncorhynchus keta | Norway / Norwegian Sea | 1960 | |
| Oncorhynchus kisutch | Belgium | To 1996 | |
| Oncorhynchus kisutch | Denmark / Baltic Sea | 2017 | |
| Oncorhynchus kisutch | Denmark / North Sea | 2017 | |
| Oncorhynchus kisutch | Latvia | 1980 | |
| Oncorhynchus kisutch | Netherlands | 1982 | |
| Oncorhynchus kisutch | Sweden / Baltic Sea | 1984 | |
| Oncorhynchus kisutch | United Kingdom (Britain) / English Channel | 1975 | |
| Oncorhynchus mykiss | Belgium | 1884 | |
| Oncorhynchus mykiss | Denmark / Baltic Sea | 1899 | |
| Oncorhynchus mykiss | Denmark / North Sea | 1899 | |
| Oncorhynchus mykiss | Estonia | 1896 | |
| Oncorhynchus mykiss | Faroe Islands | To 1990 | |
| Oncorhynchus mykiss | Finland | 1898 | |
| Oncorhynchus mykiss | France / Biscay Gulf | 1984 | |
| Oncorhynchus mykiss | France / English Channel | To 1984 | |
| Oncorhynchus mykiss | Germany / Baltic Sea | 1882 | |
| Oncorhynchus mykiss | Iceland | 1951 | |
| Oncorhynchus mykiss | Ireland | 1895 | |
| Oncorhynchus mykiss | Latvia | 1899 | |
| Oncorhynchus mykiss | Lithuania | 1890 | |
| Oncorhynchus mykiss | Netherlands | 1898 | |
| Oncorhynchus mykiss | Norway / Barents Sea | To 2012 | |
| Oncorhynchus mykiss | Norway / North Sea | To 2012 | |
| Oncorhynchus mykiss | Norway / Norwegian Sea | 1902 | |
| Oncorhynchus mykiss | Poland | 1881 - 1889 | |
| Oncorhynchus mykiss | Portugal / Azores | To 1990 | |
| Oncorhynchus mykiss | Portugal / Madeira | To 2002 | |
| Oncorhynchus mykiss | Russia / Baltic Sea / Kaliningrad area | 1882 | |
| Oncorhynchus mykiss | Russia / Baltic Sea / St. Petersburg area | 1881 - 1896 | |
| Oncorhynchus mykiss | Sweden / Baltic Sea | 1892 | |
| Oncorhynchus mykiss | Sweden / North Sea | 1894 - 1900 | |
| Oncorhynchus mykiss | Ukraine / Black Sea | 1938 - 1965 | |
| Oncorhynchus mykiss | United Kingdom (Britain) / Celtic seas | 1884 | |
| Oncorhynchus nerka | Finland | 1967 | |
| Oncorhynchus tshawytscha | Finland | 1930 | |
| Onisimus sextoni | Canada / Hudson Bay Complex | To 2012 | |
| Ophiactis macrolepidota | Israel | 1968 | |
| Ophiactis savignyi | France / Western Mediterranean | To 1969 | |
| Ophiactis savignyi | Greece / Eastern Mediterranean | 1993 | |
| Ophiactis savignyi | Israel | 1948 | |
| Ophioblennius atlanticus | Italy / Central Mediterranean | 2017 | |
| Ophryotrocha diadema | Italy / Central Mediterranean | 2006 | |
| Ophryotrocha japonica | Italy / Adriatic Sea | 1999 - 2001 | |
| Ophryotrocha japonica | Italy / Central Mediterranean | 1999 - 2001 | |
| Ophryotrocha japonica | Italy / Western Mediterranean | 1999 - 2001 | |
| Oplegnathus fasciatus | Italy / Adriatic Sea | 2015 | |
| Orchestia cavimana | Belgium | To 1927 | |
| Orchestia cavimana | Estonia | 1999 | |
| Orchestia cavimana | Germany / Baltic Sea | 1920 | |
| Orchestia cavimana | Germany / North Sea | 1920 | |
| Orchestia cavimana | Netherlands | To 1878 | |
| Orchestia cavimana | Poland | 1899 | |
| Orchestia cavimana | Russia / Baltic Sea / Kaliningrad area | 1957 - 1959 | |
| Orchestia gammarellus | Iceland | 1968 | |
| Oreochromis niloticus niloticus | Belgium | To 2000 | |
| Oscilla galilae | Greece / Eastern Mediterranean | 2016 | |
| Oscilla galilae | Israel | 2009 | |
| Oscilla jocosa | Israel | 1984 | |
| Oscilla virginiae | Israel | 2018 | |
| Osmundea oederi | Italy / Central Mediterranean | 2007 | |
| Ostorhinchus fasciatus | Israel | 2008 | |
| Ostracion cubicum | Israel | 2017 | |
| Ostracoblabe implexa | Ireland | 1949 - 1963 | |
| Ostracoblabe implexa | United Kingdom (Britain) / North Sea | 1950 | |
| Ostrea angasi | France / Biscay Gulf | 1985 | |
| Ostrea angasi | France / Celtic seas | 1985 | |
| Ostrea denselamellosa | France / Biscay Gulf | 1982 | |
| Ostrea denselamellosa | France / Celtic seas | 1982 | |
| Ostrea equestris | Ireland | 1995 | |
| Ostrea puelchana | France / Biscay Gulf | 1989 | |
| Ostrea puelchana | France / Celtic seas | 1989 | |
| Ostrea stentina | Spain / Iberian Coastal | To 2015 | |
| Ostreid herpesvirus 1 | Netherlands | To 2010 | |
| Ostreopsis ovata | France / Biscay Gulf | 2021 | |
| Ostreopsis ovata | France / Western Mediterranean | 1972 | |
| Ostreopsis ovata | Greece / Eastern Mediterranean | 2003 | |
| Ostreopsis ovata | Portugal / Iberian Coastal | To 2011 | |
| Ostreopsis siamensis | Portugal / Iberian Coastal | To 2008 | |
| Owenia borealis | Canada / Canadian Eastern Arctic | To 2011 | |
| Oxydromus humesi | Spain / Iberian Coastal | To 2017 | |
| Oxyphysis oxytoxoides | Bulgaria | 1987 | |
| Oxyphysis oxytoxoides | Turkey / Black Sea | 2007 - 2008 | |
| Oxytoxum criophilum | Sweden / North Sea | 2003 | |
| Oxytoxum gladiolus | Ukraine / Black Sea | 1989 | |
| Oxytoxum variabile | Russia / Black Sea | 2008 | |
| Oxyurichthys papuensis | Greece / Eastern Mediterranean | 2010 | |
| Oxyurichthys petersii | Israel | 1982 | |
| Pachycordyle michaeli | Denmark / Baltic Sea | 1958 | |
| Pachycordyle michaeli | Denmark / North Sea | 1958 | |
| Pachycordyle michaeli | Germany / Baltic Sea | 1960 | |
| Pachycordyle michaeli | Netherlands | 1964 | |
| Pachycordyle michaeli | Ukraine / Black Sea | From 2002 | |
| Pachycordyle michaeli | United Kingdom (Britain) / English Channel | 1973 | |
| Pachyegis brunnea | Iceland | 1990 | |
| Pachygrapsus marmoratus | France / English Channel | To 2008 | |
| Pachygrapsus transversus | France / Western Mediterranean | 1876 | |
| Pachymeniopsis gargiuloi | Italy / Central Mediterranean | To 1982 | |
| Pachymeniopsis gargiuloi | Spain / Iberian Coastal | To 2017 | |
| Pachymeniopsis lanceolata | France / Biscay Gulf | 2016 | |
| Pachymeniopsis lanceolata | Portugal / Madeira | 2006 | |
| Pacifastacus leniusculus | Belgium | 1979 | |
| Pacifastacus leniusculus | Estonia | 2014 | |
| Pacifastacus leniusculus | France / Biscay Gulf | 1970 - 1979 | |
| Pacifastacus leniusculus | France / English Channel | 1970 - 1979 | |
| Pacifastacus leniusculus | Germany / Baltic Sea | 1960 | |
| Pacifastacus leniusculus | Latvia | 1983 | |
| Pacifastacus leniusculus | Lithuania | 1972 | |
| Pacifastacus leniusculus | Netherlands | 2005 | |
| Pacifastacus leniusculus | Portugal / Iberian Coastal | To 2001 | |
| Pacifastacus leniusculus | Spain / Spain | 1974 | |
| Pacifastacus leniusculus | Sweden / Baltic Sea | 1959 - 1960 | |
| Pacificincola perforata | France / Biscay Gulf | 2001 | |
| Pacificincola perforata | France / English Channel | 2005 | |
| Pacificincola perforata | France / North Sea | 2005 | |
| Pacificincola perforata | Netherlands | 2005 | |
| Padina boergesenii | Israel | 1962 | |
| Padina boryana | Greece / Eastern Mediterranean | 1981 | |
| Pagurus longicarpus | Germany / North Sea | 2020 | |
| Palaemon adspersus | Canada / Northern Gulf of St. Lawrence | 2011 | |
| Palaemon adspersus | Canada / Southern Gulf of St. Lawrence and Eastern Scotian Shelf | 2011 | |
| Palaemon adspersus | Russia / Caspian Sea | 1936 | |
| Palaemon elegans | Denmark / Baltic Sea | 1992 | |
| Palaemon elegans | Denmark / North Sea | 2003 | |
| Palaemon elegans | Estonia | 2011 | |
| Palaemon elegans | Finland | 2003 | |
| Palaemon elegans | Germany / Baltic Sea | To 1989 | |
| Palaemon elegans | Germany / North Sea | To 2020 | |
| Palaemon elegans | Latvia | 2009 | |
| Palaemon elegans | Lithuania | 2000 - 2002 | |
| Palaemon elegans | Netherlands | To 2020 | |
| Palaemon elegans | Poland | 2002 | |
| Palaemon elegans | Russia / Baltic Sea / Kaliningrad area | 2000 - 2002 | |
| Palaemon elegans | Russia / Caspian Sea | 1939 | |
| Palaemon longirostris | Germany / Baltic Sea | To 1999 | |
| Palaemon longirostris | Poland | 2018 | |
| Palaemon macrodactylus | Belgium | 1998 | |
| Palaemon macrodactylus | Bulgaria | 2009 | |
| Palaemon macrodactylus | France / Biscay Gulf | 1998 | |
| Palaemon macrodactylus | France / Celtic seas | 2006 | |
| Palaemon macrodactylus | France / English Channel | 2009 | |
| Palaemon macrodactylus | France / North Sea | 2005 | |
| Palaemon macrodactylus | Germany / Baltic Sea | 2009 | |
| Palaemon macrodactylus | Germany / North Sea | 2004 | |
| Palaemon macrodactylus | Italy / Adriatic Sea | 2012 - 2013 | |
| Palaemon macrodactylus | Netherlands | 1999 | |
| Palaemon macrodactylus | Poland | 2014 | |
| Palaemon macrodactylus | Portugal / Iberian Coastal | To 2008 | |
| Palaemon macrodactylus | Romania | 2008 | |
| Palaemon macrodactylus | Spain / Iberian Coastal | To 1999 | |
| Palaemon macrodactylus | United Kingdom (Britain) / North Sea | 1992 | |
| Palaemonella rotumana | Israel | 1948 | |
| Palisada intermedia | Turkey / Black Sea | 1986 | |
| Palisada maris-rubri | Greece / Eastern Mediterranean | 2006 | |
| Palisada maris-rubri | Italy / Central Mediterranean | 1991 | |
| Palisada perforata | Turkey / Black Sea | 1973 | |
| Palmadusta lentiginosa | Israel | 1990 | |
| Palola valida | France / Western Mediterranean | 2022 | |
| Pandalus latirostris | Turkey / Black Sea | 1959 | |
| Pandalus latirostris | Ukraine / Black Sea | From 1959 | |
| Panulirus guttatus | Portugal / Iberian Coastal | To 2009 | |
| Panulirus longipes longipes | Israel | 2018 | |
| Panulirus ornatus | Israel | 1988 | |
| Papenfussiella kuromo | Portugal / Azores | 1990 | |
| Papilloculiceps longiceps | Israel | 1986 | |
| Parablennius incognitus | Georgia | 2001 | |
| Parablennius incognitus | Turkey / Black Sea | 2000 - 2009 | |
| Parablennius incognitus | Ukraine / Black Sea | 2002 | |
| Paracanthurus hepatus | France / Western Mediterranean | 2021 | |
| Paracanthurus hepatus | Israel | 2015 | |
| Paracaprella pusilla | Israel | 2010 | |
| Paracaprella pusilla | Spain / Iberian Coastal | 2010 | |
| Paracartia grani | France / Biscay Gulf | 1974 | |
| Paracartia grani | France / English Channel | 1981 | |
| Paracartia grani | France / North Sea | 1981 | |
| Paracartia grani | France / Western Mediterranean | 1997 | |
| Paracartia grani | Greece / Eastern Mediterranean | 1988 | |
| Paracerceis sculpta | Australia / Bass strait | 1995 | |
| Paracerceis sculpta | France / Western Mediterranean | 2014 | |
| Paracerceis sculpta | Greece / Eastern Mediterranean | 2009 | |
| Paracerceis sculpta | Italy / Adriatic Sea | 1981 | |
| Paracerceis sculpta | Italy / Central Mediterranean | 1981 | |
| Paracerceis sculpta | Italy / Western Mediterranean | 1983 | |
| Paracerceis sculpta | Portugal / Azores | 2014 | |
| Paracerceis sculpta | Portugal / Madeira | From 2015 | |
| Paradella dianae | Greece / Eastern Mediterranean | 1997 | |
| Paradella dianae | Italy / Central Mediterranean | 2016 | |
| Paradella dianae | Italy / Western Mediterranean | 1985 | |
| Paradoxostoma angliorum | Ireland | 2007 | |
| Paralaeospira malardi | Ireland | 1977 | |
| Paralaeospira malardi | United Kingdom (Britain) / Celtic seas | 1999 | |
| Paralaeospira malardi | United Kingdom (Britain) / English Channel | 1999 | |
| Paraleucilla magna | Greece / Eastern Mediterranean | 2014 | |
| Paraleucilla magna | Italy / Adriatic Sea | 2007 | |
| Paraleucilla magna | Italy / Central Mediterranean | 2001 | |
| Paraleucilla magna | Italy / Western Mediterranean | 2004 | |
| Paraleucilla magna | Portugal / Azores | To 2006 | |
| Paraleucilla magna | Portugal / Iberian Coastal | To 2008 | |
| Paraleucilla magna | Portugal / Madeira | To 2007 | |
| Paralichthys lethostigma | Israel | 2009 | |
| Paralithodes camtschaticus | Italy / Central Mediterranean | 2008 | |
| Paralithodes camtschaticus | Norway / Barents Sea | 1977 | |
| Paralithodes camtschaticus | Russia / White Sea | 2010 | |
| Parametopella cypris | Italy / Adriatic Sea | 2014 | |
| Paramphiascella vararensis | Ukraine / Black Sea | From 1964 | |
| Paramysis (Mesomysis) intermedia | Estonia | 2008 | |
| Paramysis (Mesomysis) intermedia | Russia / Baltic Sea / Kaliningrad area | 2008 | |
| Paramysis (Serrapalpisis) lacustris | Germany / Baltic Sea | 2013 | |
| Paramysis (Serrapalpisis) lacustris | Latvia | 1966 | |
| Paramysis (Serrapalpisis) lacustris | Lithuania | 1962 | |
| Paramysis (Serrapalpisis) lacustris | Russia / Baltic Sea / Kaliningrad area | 1962 | |
| Paranais botniensis | Germany / North Sea | 1992 | |
| Paranais frici | Finland | 2000 - 2008 | |
| Paranais frici | Netherlands | To 2016 | |
| Paranais frici | Russia / Baltic Sea / Kaliningrad area | 1998 | |
| Paranais frici | Russia / Baltic Sea / St. Petersburg area | 1960 - 1969 | |
| Paranthura japonica | France / Biscay Gulf | 2007 | |
| Paranthura japonica | France / English Channel | 2019 | |
| Paranthura japonica | France / Western Mediterranean | 2014 | |
| Paranthura japonica | Greece / Eastern Mediterranean | 2012 | |
| Paranthura japonica | Italy / Adriatic Sea | 2005 | |
| Paranthura japonica | Italy / Central Mediterranean | 2013 | |
| Paranthura japonica | Italy / Western Mediterranean | 2010 - 2011 | |
| Paraonides nordica | Canada / Canadian Eastern Arctic | To 2011 | |
| Paraonides nordica | Canada / Hudson Bay Complex | To 2012 | |
| Paraphyllina ransoni | Turkey / Black Sea | 2011 | |
| Parapilumnus malardi | France / Celtic seas | 1910 | |
| Paraprionospio coora | Greece / Eastern Mediterranean | 1993 | |
| Paraprionospio coora | Spain / Iberian Coastal | To 2010 | |
| Parasagitta setosa | Russia / Caspian Sea | 2004 | |
| Parasmittina alba | Portugal / Madeira | 2014 | |
| Parasmittina egyptiaca | Israel | 2009 | |
| Parasmittina multiaviculata | Portugal / Madeira | 2014 | |
| Parasmittina protecta | Israel | 2010 | |
| Parasmittina protecta | Portugal / Madeira | 2010 | |
| Parasmittina trispinosa | Australia / Bass strait | 1950 | |
| Paratapes textilis | Israel | 1946 | |
| Paratapes textilis | Italy / Adriatic Sea | 2003 | |
| Paratenuisentis ambiguus | Germany / North Sea | To 1960 | |
| Paratenuisentis ambiguus | Poland | 2001 | |
| Paratenuisentis ambiguus | Russia / Baltic Sea / Kaliningrad area | 2004 | |
| Parexocoetus mento | Greece / Central Mediterranean | 1980 - 1987 | |
| Parexocoetus mento | Greece / Eastern Mediterranean | 1946 - 1964 | |
| Parexocoetus mento | Israel | 1935 | |
| Parkermavella globifera | Iceland | 1990 | |
| Parthenina cossmanni | Israel | 2016 | |
| Parthenina typica | Israel | 2015 | |
| Parupeneus forsskali | Greece / Eastern Mediterranean | 2017 | |
| Parupeneus forsskali | Israel | 2013 | |
| Parviphycus pannosus | Turkey / Black Sea | 2000 - 2009 | |
| Parvocalanus crassirostris | Croatia | 2014 | |
| Parvocalanus crassirostris | Greece / Eastern Mediterranean | 2009 | |
| Parvocalanus crassirostris | Italy / Adriatic Sea | 2016 | |
| Parvocaulis parvulus | Israel | 1935 | |
| Patella vulgata | Belgium | To 2011 | |
| Paucibranchia adenensis | Greece / Central Mediterranean | 2012 | |
| Paucibranchia adenensis | Greece / Eastern Mediterranean | 2009 | |
| Pegophysema philippiana | Israel | 2018 | |
| Pelates quadrilineatus | Israel | 1969 | |
| Pempheris rhomboidea | Greece / Eastern Mediterranean | 1983 | |
| Pempheris rhomboidea | Israel | 1979 | |
| Penaeus aztecus | Belgium | 2018 | |
| Penaeus aztecus | France / Western Mediterranean | 2015 | |
| Penaeus aztecus | Greece / Adriatic Sea | 2018 | |
| Penaeus aztecus | Greece / Central Mediterranean | 2013 | |
| Penaeus aztecus | Greece / Eastern Mediterranean | 2012 | |
| Penaeus aztecus | Israel | 2015 | |
| Penaeus aztecus | Italy / Adriatic Sea | 2016 - 2017 | |
| Penaeus aztecus | Italy / Central Mediterranean | 2014 | |
| Penaeus aztecus | Italy / Western Mediterranean | 2014 | |
| Penaeus hathor | Greece / Eastern Mediterranean | 2012 | |
| Penaeus hathor | Israel | 1997 | |
| Penaeus japonicus | China / Yellow Sea | To 2005 | |
| Penaeus japonicus | France / Biscay Gulf | 1980 | |
| Penaeus japonicus | France / Celtic seas | 1980 | |
| Penaeus japonicus | France / English Channel | 2016 | |
| Penaeus japonicus | France / Western Mediterranean | To 1972 | |
| Penaeus japonicus | Ireland | 2007 | |
| Penaeus japonicus | Italy / Adriatic Sea | 1979 | |
| Penaeus japonicus | Italy / Western Mediterranean | 1979 | |
| Penaeus japonicus | Portugal / Iberian Coastal | 1985 | |
| Penaeus japonicus | Turkey / Black Sea | 1960 - 1969 | |
| Penaeus japonicus | Ukraine / Black Sea | From 1977 | |
| Penaeus japonicus | United Kingdom (Britain) / English Channel | 1989 | |
| Penaeus pulchricaudatus | Greece / Eastern Mediterranean | 1995 | |
| Penaeus pulchricaudatus | Israel | 1951 | |
| Penaeus pulchricaudatus | Italy / Adriatic Sea | 1997 | |
| Penaeus semisulcatus | France / English Channel | 2016 | |
| Penaeus semisulcatus | Israel | 1951 | |
| Penaeus semisulcatus | Russia / Black Sea | 2005 | |
| Peneroplis arietinus | Italy / Central Mediterranean | 2017 | |
| Penilia avirostris | France / Western Mediterranean | 1959 | |
| Penilia avirostris | Germany / Baltic Sea | 2003 | |
| Penilia avirostris | Germany / North Sea | To 1948 | |
| Penilia avirostris | Iran / Caspian Sea | From 1982 | |
| Penilia avirostris | Sweden / North Sea | 1997 | |
| Penilia avirostris | United Kingdom (Britain) / North Sea | 1947 | |
| Perccottus glenii | Poland | 1993 | |
| Perccottus glenii | Russia / Baltic Sea / Kaliningrad area | 1982 | |
| Perccottus glenii | Russia / Baltic Sea / St. Petersburg area | 1916 - 1929 | |
| Percnon gibbesi | France / Western Mediterranean | 2014 | |
| Percnon gibbesi | Greece / Central Mediterranean | 2004 | |
| Percnon gibbesi | Greece / Eastern Mediterranean | 2004 | |
| Percnon gibbesi | Portugal / Iberian Coastal | To 1931 | |
| Perforatus perforatus | Belgium | To 2011 | |
| Perforatus perforatus | Portugal / Azores | To 2011 | |
| Peridiniella danica | Denmark / Baltic Sea | 1901 | |
| Peridiniella danica | Denmark / North Sea | 1901 | |
| Peridiniopsis polonicum | Bulgaria | 2008 | |
| Peridinium quadridentatum | Bulgaria | 2000 | |
| Peridinium quadridentatum | Denmark / Baltic Sea | 2005 | |
| Peridinium quadridentatum | Denmark / North Sea | 2005 | |
| Peridinium quadridentatum | Romania | 2008 | |
| Peridinium quadridentatum | Russia / Black Sea | 2005 | |
| Peridinium quadridentatum | Sweden / Baltic Sea | 2008 | |
| Peridinium quadridentatum | Sweden / North Sea | 2007 | |
| Perisesarma alberti | France / English Channel | 2016 | |
| Perkinsus chesapeaki | France / Biscay Gulf | To 1992 | |
| Perkinsus chesapeaki | France / Celtic seas | To 1992 | |
| Perkinsus chesapeaki | France / English Channel | To 1992 | |
| Perkinsus chesapeaki | France / North Sea | To 1992 | |
| Perkinsus chesapeaki | France / Western Mediterranean | To 1992 | |
| Perkinsus olsenii | France / Biscay Gulf | To 1992 | |
| Perkinsus olsenii | France / Celtic seas | 2005 | |
| Perkinsus olsenii | France / English Channel | To 1992 | |
| Perkinsus olsenii | France / North Sea | To 1992 | |
| Perkinsus olsenii | France / Western Mediterranean | To 1992 | |
| Perkinsus olsenii | Portugal / Iberian Coastal | 1987 | |
| Perkinsus olsenii | Spain / Iberian Coastal | 1983 | |
| Perkinsyllis augeneri | Israel | 2009 | |
| Perna perna | Israel | 1965 | |
| Perophora japonica | France / Celtic seas | 1982 | |
| Perophora japonica | France / English Channel | 1982 | |
| Perophora japonica | France / North Sea | 1996 | |
| Perophora japonica | Germany / North Sea | 2007 | |
| Perophora japonica | Ireland | 2012 | |
| Perophora japonica | Netherlands | 2004 | |
| Perophora japonica | Spain / Iberian Coastal | 2008 | |
| Perophora japonica | United Kingdom (Britain) / Celtic seas | 2003 | |
| Perophora japonica | United Kingdom (Britain) / English Channel | 2005 | |
| Perophora multiclathrata | France / Western Mediterranean | 1987 | |
| Perophora multiclathrata | Italy / Central Mediterranean | 2013 - 2014 | |
| Perophora viridis | France / Western Mediterranean | 1987 | |
| Perophora viridis | Italy / Adriatic Sea | 1973 - 1975 | |
| Perophora viridis | Italy / Western Mediterranean | To 1921 | |
| Perophora viridis | Portugal / Azores | To 1971 | |
| Petalonia binghamiae | Portugal / Azores | 1985 | |
| Petalonia fascia | Australia / Bass strait | 1971 | |
| Petricolaria pholadiformis | Belgium | 1899 | |
| Petricolaria pholadiformis | Denmark / Baltic Sea | 1926 | |
| Petricolaria pholadiformis | Denmark / North Sea | 1905 | |
| Petricolaria pholadiformis | France / English Channel | 1972 | |
| Petricolaria pholadiformis | France / North Sea | 1972 | |
| Petricolaria pholadiformis | Germany / Baltic Sea | 1927 | |
| Petricolaria pholadiformis | Germany / North Sea | 1896 | |
| Petricolaria pholadiformis | Greece / Eastern Mediterranean | 1985 | |
| Petricolaria pholadiformis | Netherlands | To 1899 | |
| Petricolaria pholadiformis | Norway / North Sea | To 1955 | |
| Petricolaria pholadiformis | Spain / Iberian Coastal | To 2007 | |
| Petricolaria pholadiformis | Sweden / North Sea | 1931 - 1944 | |
| Petricolaria pholadiformis | United Kingdom (Britain) / English Channel | 1893 | |
| Petricolaria pholadiformis | United Kingdom (Britain) / North Sea | 1893 | |
| Petroscirtes ancylodon | Greece / Eastern Mediterranean | 2004 | |
| Petroscirtes ancylodon | Israel | 1988 | |
| Petrospongium rugosum | Australia / Bass strait | 1971 | |
| Peyssonnelia conchicola | Australia / Bass strait | 1981 | |
| Peyssonnelia rosa-marina | Turkey / Black Sea | 2000 - 2009 | |
| Pfiesteria piscicida | Norway / North Sea | 2000 | |
| Pfiesteria shumwayae | Norway / North Sea | 2000 | |
| Phaenna spinifera | Romania | 1978 | |
| Phaeocystis pouchetii | Bulgaria | 1989 - 1990 | |
| Phaeocystis pouchetii | Denmark / Baltic Sea | 1980 | |
| Phaeocystis pouchetii | Denmark / North Sea | 1980 | |
| Phaeocystis pouchetii | Greece / Eastern Mediterranean | 1983 | |
| Phaeocystis pouchetii | Romania | 1990 - 1999 | |
| Phaeocystis pouchetii | Russia / Black Sea | 2006 | |
| Phaeocystis pouchetii | Sweden / Baltic Sea | To 1980 | |
| Phaeocystis pouchetii | Ukraine / Black Sea | 1990 | |
| Phallusia mammillata | France / English Channel | To 1900 | |
| Phallusia mammillata | France / North Sea | To 1900 | |
| Phallusia mammillata | Ireland | 1890 - 1920 | |
| Phallusia mammillata | Portugal / Madeira | 1992 - 1995 | |
| Phallusia nigra | Greece / Central Mediterranean | 2015 | |
| Phallusia nigra | Greece / Eastern Mediterranean | 2008 | |
| Phallusia nigra | Israel | 1952 | |
| Pherusella brevituba | Italy / Western Mediterranean | 1996 | |
| Phialella quadrata | Australia / Bass strait | 1915 | |
| Phidiana militaris | Israel | 2016 | |
| Philinopsis speciosa | Israel | 2009 | |
| Phorbas tenacior | Australia / Bass strait | 1989 | |
| Phorcus lineatus | Netherlands | To 1985 | |
| Photis lamellifera | Israel | To 1959 | |
| Photis lamellifera | Italy / Central Mediterranean | 1990 | |
| Phrix spatulata | Greece / Central Mediterranean | 2009 | |
| Phyllodicola petiti | United Kingdom (Britain) / Celtic seas | 1989 | |
| Phyllodoce groenlandica | Spain / Iberian Coastal | To 2016 | |
| Phyllodoce longifrons | Israel | 1972 | |
| Phyllopodopsyllus bradyi | Ukraine / Black Sea | 1969 | |
| Phyllorhiza punctata | Greece / Central Mediterranean | 2005 | |
| Phyllorhiza punctata | Israel | 1965 | |
| Phyllorhiza punctata | Italy / Western Mediterranean | 2009 | |
| Physa sp. | United Kingdom (Britain) / Celtic seas / Channel Islands | | |
| Physella acuta | Belgium | To 1869 | |
| Physella acuta | Germany / Baltic Sea | 2022 | |
| Physella acuta | Germany / North Sea | 1895 | |
| Physella acuta | Netherlands | To 2015 | |
| Piaractus brachypomus | Denmark / Baltic Sea | 2013 | |
| Piaractus brachypomus | Denmark / North Sea | 2013 | |
| Pigrogromitus timsanus | Israel | 1960 | |
| Pikea californica | Spain / Iberian Coastal | 1991 | |
| Pikea californica | United Kingdom (Britain) / Celtic seas | 1967 | |
| Pikea californica | United Kingdom (Britain) / English Channel | 1967 | |
| Pileolaria berkeleyana | France / Biscay Gulf | 2007 | |
| Pileolaria berkeleyana | France / English Channel | 2007 | |
| Pileolaria berkeleyana | France / Western Mediterranean | 1977 | |
| Pileolaria berkeleyana | Germany / North Sea | 2013 | |
| Pileolaria berkeleyana | Italy / Central Mediterranean | 2008 | |
| Pileolaria berkeleyana | Italy / Western Mediterranean | To 1995 | |
| Pileolaria berkeleyana | Netherlands | To 2010 | |
| Pileolaria berkeleyana | Portugal / Madeira | To 1980 | |
| Pileolaria berkeleyana | Spain / Canary Islands | To 1980 | |
| Pileolaria berkeleyana | United Kingdom (Britain) / Celtic seas / Channel Islands | 1982 | |
| Pileolaria berkeleyana | United Kingdom (Britain) / English Channel | 1974 | |
| Pileolaria militaris | Germany / North Sea | 2012 | |
| Pileolaria militaris | Ireland | 1977 | |
| Pileolaria militaris | United Kingdom (Britain) / Celtic seas | To 1977 | |
| Pileolaria militaris | United Kingdom (Britain) / English Channel | To 1977 | |
| Pilumnoides inglei | Ireland | To 1899 | |
| Pilumnopeus vauquelini | Israel | 1951 | |
| Pilumnus hirtellus | Sweden / North Sea | 2005 | |
| Pilumnus spinifer | Sweden / North Sea | To 2005 | |
| Pinctada imbricata radiata | France / Western Mediterranean | 1979 | |
| Pinctada imbricata radiata | Greece / Central Mediterranean | 1995 | |
| Pinctada imbricata radiata | Greece / Eastern Mediterranean | 1961 | |
| Pinctada imbricata radiata | Israel | 1899 | |
| Pinctada imbricata radiata | Italy / Central Mediterranean | 1961 | |
| Pinctada imbricata radiata | Italy / Western Mediterranean | To 1993 | |
| Pinctada imbricata radiata | Portugal / Azores | To 1998 | |
| Pinctada imbricata radiata | United Kingdom (Britain) / English Channel | 1986 | |
| Pinctada margaritifera | Italy / Central Mediterranean | 1890 - 1899 | |
| Pinguipes brasilianus | Italy / Central Mediterranean | 1990 | |
| Pinguipes brasilianus | Italy / Western Mediterranean | 1990 | |
| Pinnularia trevelyana | Ukraine / Black Sea | From 1902 | |
| Pisinna glabrata | United Kingdom (Britain) / English Channel | To 2010 | |
| Pista unibranchia | Italy / Central Mediterranean | 1981 | |
| Pista unibranchia | Italy / Western Mediterranean | 2018 | |
| Pista unibranchia | Spain / Iberian Coastal | To 2017 | |
| Plagiolemma distortum | France / Celtic seas | To 2014 | |
| Plagiolemma distortum | Germany / North Sea | To 2001 | |
| Plagiolemma distortum | Netherlands | To 2001 | |
| Plagiolemma distortum | United Kingdom (Britain) / English Channel | To 1992 | |
| Plagiolemma distortum | United Kingdom (Britain) / North Sea | To 2014 | |
| Plagusia squamosa | France / Western Mediterranean | 1873 | |
| Planaxis savignyi | Israel | 1997 | |
| Planiliza haematocheila | Greece / Eastern Mediterranean | 1995 | |
| Planogypsina acervalis | Greece / Eastern Mediterranean | 2001 | |
| Planorbarius corneus | Ireland | 1815 | |
| Platax teira | Israel | 2010 | |
| Platichthys flesus | Iceland | 1999 | |
| Platorchestia platensis | Denmark / Baltic Sea | 1860 | |
| Platorchestia platensis | Denmark / North Sea | 1860 | |
| Platorchestia platensis | France / English Channel | 1900 | |
| Platorchestia platensis | France / North Sea | 1900 | |
| Platorchestia platensis | Germany / Baltic Sea | 1940 | |
| Platorchestia platensis | Germany / North Sea | 1931 | |
| Platorchestia platensis | Netherlands | To 1950 | |
| Platorchestia platensis | Norway / North Sea | 1980 - 1989 | |
| Platorchestia platensis | Poland | 2005 | |
| Platorchestia platensis | Sweden / Baltic Sea | 1930 - 1940 | |
| Platorchestia platensis | Sweden / North Sea | To 1940 | |
| Platycephalus armatus | Spain / Canary Islands | To 2015 | |
| Platycephalus indicus | Israel | 1953 | |
| Platysiphonia caribaea | Spain / Canary Islands | 1980 - 1989 | |
| Plecoglossus altivelis altivelis | Ukraine / Azov Sea | 1960 - 1979 | |
| Plecoglossus altivelis altivelis | Ukraine / Black Sea | 1963 - 1979 | |
| Pleopis polyphaemoides | Russia / Caspian Sea | 1957 | |
| Pleurobranchus forskalii | Israel | 1975 | |
| Pleurosigma planctonicum | France / Celtic seas | 1966 | |
| Pleurosigma simonsenii | France / Celtic seas | 1966 | |
| Pleurosigma simonsenii | France / English Channel | 1966 | |
| Pleurosigma simonsenii | France / North Sea | 1966 | |
| Pleurosigma simonsenii | Germany / North Sea | To 2020 | |
| Pleurosigma simonsenii | Netherlands | 1974 | |
| Pleurosigma simonsenii | United Kingdom (Britain) / English Channel | To 1972 | |
| Plocamium secundatum | Italy / Central Mediterranean | 1991 | |
| Plocamopherus ocellatus | Israel | 1977 | |
| Plotosus lineatus | Israel | 2001 | |
| Plumatella casmiana | Germany / Baltic Sea | To 1886 | |
| Plumatella casmiana | Germany / North Sea | To 1995 | |
| Plumularia obliqua | Australia / Bass strait | 1884 | |
| Plumularia setacea | Australia / Bass strait | 1885 | |
| Podon intermedius | Russia / Caspian Sea | 1985 | |
| Poecilia reticulata | Germany / North Sea | 1980 - 1989 | |
| Poecilia reticulata | Netherlands | To 1985 | |
| Pollia dorbignyi | Portugal / Azores | To 1998 | |
| Pollicipes pollicipes | Ireland | 1820 - 1856 | |
| Polyandrocarpa zorritensis | Italy / Central Mediterranean | 2001 | |
| Polyandrocarpa zorritensis | Italy / Western Mediterranean | 1974 | |
| Polyandrocarpa zorritensis | Portugal / Madeira | 2014 | |
| Polycera hedgpethi | Australia / Bass strait | To 1989 | |
| Polycera hedgpethi | Italy / Adriatic Sea | 2009 | |
| Polycera hedgpethi | Italy / Central Mediterranean | 2012 | |
| Polycera hedgpethi | Italy / Western Mediterranean | 1986 | |
| Polycera hedgpethi | Spain / Iberian Coastal | 2002 | |
| Polycerella emertoni | Greece / Central Mediterranean | 1995 | |
| Polycerella emertoni | Italy / Western Mediterranean | 1964 | |
| Polycirrus twisti | Greece / Central Mediterranean | 2010 | |
| Polycirrus twisti | Greece / Eastern Mediterranean | 1983 | |
| Polyclinum aurantium | Portugal / Azores | To 1971 | |
| Polyclinum constellatum | Italy / Central Mediterranean | 2018 | |
| Polydora aggregata | Denmark / Baltic Sea | 2017 | |
| Polydora ciliata | France / Celtic seas | 1921 | |
| Polydora ciliata | France / English Channel | 1921 | |
| Polydora colonia | France / Biscay Gulf | 2021 | |
| Polydora colonia | Italy / Adriatic Sea | 2009 | |
| Polydora cornuta | Bulgaria | 1962 | |
| Polydora cornuta | Denmark / Baltic Sea | 1943 | |
| Polydora cornuta | Denmark / North Sea | 1941 | |
| Polydora cornuta | Greece / Eastern Mediterranean | 2008 | |
| Polydora cornuta | Italy / Adriatic Sea | 1990 - 1999 | |
| Polydora cornuta | Portugal / Iberian Coastal | To 2017 | |
| Polydora cornuta | Romania | 1970 - 1979 | |
| Polydora cornuta | Russia / Black Sea | 2009 | |
| Polydora cornuta | Ukraine / Black Sea | From 1962 | |
| Polydora hoplura | Belgium | To 1962 | |
| Polydora hoplura | France / English Channel | 1894 - 1921 | |
| Polydora hoplura | France / North Sea | To 1921 | |
| Polydora hoplura | Netherlands | To 1949 | |
| Polydora hoplura | New Zealand / New Zealand Shelf / North Island | To 1975 | |
| Polydora hoplura | New Zealand / New Zealand Shelf / South Island | To 1975 | |
| Polydora onagawaensis | France / English Channel | 2018 | |
| Polydora onagawaensis | Sweden / North Sea | To 2023 | |
| Polydora triglanda | France / Biscay Gulf | To 2017 | |
| Polydora triglanda | Spain / Iberian Coastal | To 2016 | |
| Polydora websteri | France / English Channel | 2018 | |
| Polydora websteri | Germany / North Sea | 2014 | |
| Polydora websteri | Netherlands | 2017 | |
| Polydora websteri | Romania | 1901 - 2000 | |
| Polydora websteri | Sweden / North Sea | 2020 | |
| Polylabris cf. mamaevi | Israel | 1971 | |
| Polyopes lancifolius | France / Biscay Gulf | 2008 | |
| Polyopes lancifolius | France / English Channel | 2011 | |
| Polysiphonia atlantica | France / Western Mediterranean | 1984 | |
| Polysiphonia atlantica | Greece / Central Mediterranean | 2001 | |
| Polysiphonia atlantica | Greece / Eastern Mediterranean | 1988 | |
| Polysiphonia atlantica | Israel | 2016 | |
| Polysiphonia morrowii | France / Biscay Gulf | To 2011 | |
| Polysiphonia morrowii | France / Celtic seas | To 2012 | |
| Polysiphonia morrowii | France / English Channel | 1970 - 1979 | |
| Polysiphonia morrowii | France / Western Mediterranean | 1997 | |
| Polysiphonia morrowii | Italy / Adriatic Sea | 1999 | |
| Polysiphonia morrowii | Italy / Central Mediterranean | 2012 | |
| Polysiphonia paniculata | France / Western Mediterranean | 1967 | |
| Polysiphonia paniculata | Italy / Central Mediterranean | To 2010 | |
| Polysiphonia paniculata | Italy / Western Mediterranean | To 2001 | |
| Polysiphonia paniculata | Turkey / Black Sea | 1972 | |
| Polysiphonia schneideri | Italy / Adriatic Sea | 2017 | |
| Polysiphonia senticulosa | Australia / Bass strait | 1969 | |
| Polysiphonia senticulosa | Belgium | 2001 | |
| Polysiphonia senticulosa | France / English Channel | 2001 | |
| Polysiphonia senticulosa | France / North Sea | 2001 | |
| Polysiphonia senticulosa | Netherlands | 1993 | |
| Polysiphonia subtilissima | Australia / Bass strait | 1983 | |
| Polysiphonia subtilissima | Ireland | To 2006 | |
| Pomacanthus imperator | Greece / Eastern Mediterranean | 2006 | |
| Pomacanthus imperator | Israel | 2009 | |
| Pomadasys stridens | Greece / Eastern Mediterranean | 2019 | |
| Pomadasys stridens | Israel | 1971 | |
| Pomadasys stridens | Italy / Western Mediterranean | 1968 | |
| Pomatoschistus bathi | Georgia | 2000 - 2009 | |
| Pomatoschistus bathi | Ukraine / Black Sea | 2000 - 2009 | |
| Pontastacus leptodactylus | Netherlands | 1978 | |
| Pontogammarus robustoides | Estonia | 2006 | |
| Pontogammarus robustoides | Germany / Baltic Sea | 1994 | |
| Pontogammarus robustoides | Latvia | 1966 | |
| Pontogammarus robustoides | Lithuania | 1962 | |
| Pontogammarus robustoides | Poland | 1988 | |
| Pontogammarus robustoides | Russia / Baltic Sea / Kaliningrad area | 1962 - 1963 | |
| Pontogammarus robustoides | Russia / Baltic Sea / St. Petersburg area | 1999 | |
| Porcellidium ovatum | Ireland | 1980 - 1984 | |
| Poropila dubia | Bulgaria | 1948 | |
| Poropila dubia | Romania | 1948 | |
| Poropila dubia | Ukraine / Black Sea | 1948 | |
| Porphyra minor | Turkey / Black Sea | 2000 - 2009 | |
| Porphyra tenera | Spain / Iberian Coastal | To 1999 | |
| Porphyra umbilicalis | Turkey / Black Sea | 2000 - 2009 | |
| Porphyra yezoensis | France / Western Mediterranean | 1975 | |
| Portunus segnis | Greece / Eastern Mediterranean | 1991 | |
| Portunus segnis | Israel | 1924 | |
| Portunus segnis | Italy / Central Mediterranean | 1966 | |
| Portunus segnis | Italy / Western Mediterranean | 2004 | |
| Potamopyrgus antipodarum | Belgium | 1927 | |
| Potamopyrgus antipodarum | Denmark / Baltic Sea | 1914 | |
| Potamopyrgus antipodarum | Denmark / North Sea | 1914 | |
| Potamopyrgus antipodarum | Estonia | 1850 - 1889 | |
| Potamopyrgus antipodarum | Finland | 1850 - 1899 | |
| Potamopyrgus antipodarum | France / Biscay Gulf | 1967 | |
| Potamopyrgus antipodarum | France / English Channel | 1984 | |
| Potamopyrgus antipodarum | France / North Sea | 1951 | |
| Potamopyrgus antipodarum | France / Western Mediterranean | 1948 | |
| Potamopyrgus antipodarum | Germany / Baltic Sea | 1887 | |
| Potamopyrgus antipodarum | Germany / North Sea | 1900 | |
| Potamopyrgus antipodarum | Ireland | To 1897 | |
| Potamopyrgus antipodarum | Latvia | 1801 - 1889 | |
| Potamopyrgus antipodarum | Lithuania | 1954 | |
| Potamopyrgus antipodarum | Netherlands | 1913 | |
| Potamopyrgus antipodarum | Norway / North Sea | 1952 | |
| Potamopyrgus antipodarum | Norway / Norwegian Sea | To 2012 | |
| Potamopyrgus antipodarum | Poland | 1933 | |
| Potamopyrgus antipodarum | Portugal / Iberian Coastal | To 1978 | |
| Potamopyrgus antipodarum | Russia / Baltic Sea / Kaliningrad area | 1917 - 1926 | |
| Potamopyrgus antipodarum | Russia / Baltic Sea / St. Petersburg area | 1930 - 1939 | |
| Potamopyrgus antipodarum | Spain / Iberian Coastal | 1801 - 1900 | |
| Potamopyrgus antipodarum | Sweden / Baltic Sea | 1887 | |
| Potamopyrgus antipodarum | Sweden / North Sea | 1887 | |
| Potamopyrgus antipodarum | United Kingdom (Britain) / Celtic seas | 1859 | |
| Potamopyrgus antipodarum | United Kingdom (Britain) / English Channel | 1859 | |
| Potamopyrgus antipodarum | United Kingdom (Britain) / North Sea | 1859 | |
| Potamopyrgus antipodarum | United Kingdom (Britain) / North Sea / Orkney Islands | To 1938 | |
| Potamothrix bavaricus | Germany / Baltic Sea | To 2015 | |
| Potamothrix bavaricus | Netherlands | To 2016 | |
| Potamothrix bavaricus | Russia / Baltic Sea / Kaliningrad area | 1997 | |
| Potamothrix bedoti | Sweden / Baltic Sea | 1915 | |
| Potamothrix hammoniensis | Germany / North Sea | To 2017 | |
| Potamothrix hammoniensis | Poland | 2010 | |
| Potamothrix heuscheri | Finland | 1960 - 1970 | |
| Potamothrix heuscheri | Russia / Baltic Sea / St. Petersburg area | 1960 - 1969 | |
| Potamothrix heuscheri | Sweden / Baltic Sea | 1960 - 1969 | |
| Potamothrix moldaviensis | Germany / Baltic Sea | To 2015 | |
| Potamothrix moldaviensis | Germany / North Sea | To 2015 | |
| Potamothrix moldaviensis | Poland | 2008 | |
| Potamothrix moldaviensis | Russia / Baltic Sea / Kaliningrad area | 1996 | |
| Potamothrix moldaviensis | Russia / Baltic Sea / St. Petersburg area | 1950 - 1959 | |
| Potamothrix vejdovskyi | Belgium | To 2009 | |
| Potamothrix vejdovskyi | Germany / North Sea | To 2015 | |
| Potamothrix vejdovskyi | Poland | 2008 | |
| Potamothrix vejdovskyi | Russia / Baltic Sea / Kaliningrad area | 1997 | |
| Potamothrix vejdovskyi | Russia / Baltic Sea / St. Petersburg area | 1960 - 1969 | |
| Potamothrix vejdovskyi | Sweden / Baltic Sea | 1967 - 1970 | |
| Praunus flexuosus | Iceland | 1970 | |
| Predaea huismanii | Spain / Canary Islands | 1980 - 1989 | |
| Priacanthus sagittarius | Israel | 2009 | |
| Primavelans glabricollaris | Germany / North Sea | 2019 | |
| Primavelans glabricollaris | Netherlands | To 2019 | |
| Prionace glauca | Romania | 1940 - 1949 | |
| Prionospio aluta | Portugal / Iberian Coastal | To 2017 | |
| Prionospio pulchra | Greece / Eastern Mediterranean | 1991 | |
| Prionospio pulchra | Portugal / Iberian Coastal | To 2012 | |
| Prionospio pulchra | Spain / Iberian Coastal | To 2000 | |
| Prionospio pulchra | Turkey / Black Sea | 2000 | |
| Proameira simplex | Ukraine / Black Sea | From 1964 | |
| Proasellus coxalis | Belgium | To 1998 | |
| Proasellus coxalis | Germany / Baltic Sea | 2011 | |
| Proasellus coxalis | Germany / North Sea | 1930 - 1939 | |
| Proboscia indica | Germany / North Sea | 1966 - 1971 | |
| Proboscia indica | Netherlands | 1990 | |
| Procambarus acutus | Netherlands | 2002 | |
| Procambarus clarkii | Belgium | To 2014 | |
| Procambarus clarkii | France / Biscay Gulf | 1970 - 1979 | |
| Procambarus clarkii | France / English Channel | 1970 - 1979 | |
| Procambarus clarkii | Germany / North Sea | 1985 | |
| Procambarus clarkii | Italy / Adriatic Sea | 2007 | |
| Procambarus clarkii | Italy / Western Mediterranean | To 2000 | |
| Procambarus clarkii | Netherlands | 1985 | |
| Procambarus clarkii | Portugal / Azores | To 1994 | |
| Procambarus clarkii | Portugal / Iberian Coastal | 1979 | |
| Procambarus clarkii | Spain / Canary Islands | 1996 - 1997 | |
| Procambarus clarkii | Spain / Spain | 1973 - 1974 | |
| Procambarus fallax f. virginalis | Belgium | 2020 | |
| Procambarus fallax f. virginalis | France / North Sea | 2019 | |
| Procambarus fallax f. virginalis | Germany / North Sea | 2003 | |
| Procambarus fallax f. virginalis | Netherlands | To 2004 | |
| Proceraea cornuta | Netherlands | 1941 | |
| Proceraea cornuta | United Kingdom (Britain) / English Channel | 1929 | |
| Pronoctiluca pelagica | Ukraine / Black Sea | From 1983 | |
| Prorocentrum borbonicum | Greece / Eastern Mediterranean | 2004 | |
| Prorocentrum cordatum | Belgium | To 2006 | |
| Prorocentrum cordatum | Bulgaria | 1948 | |
| Prorocentrum cordatum | Denmark / Baltic Sea | 1981 | |
| Prorocentrum cordatum | Denmark / North Sea | To 1979 | |
| Prorocentrum cordatum | Estonia | 1997 | |
| Prorocentrum cordatum | Finland | 1993 | |
| Prorocentrum cordatum | France / Biscay Gulf | To 1987 | |
| Prorocentrum cordatum | France / Celtic seas | To 1987 | |
| Prorocentrum cordatum | France / English Channel | To 1987 | |
| Prorocentrum cordatum | France / Western Mediterranean | 1984 | |
| Prorocentrum cordatum | Georgia | 1999 | |
| Prorocentrum cordatum | Germany / Baltic Sea | 1982 | |
| Prorocentrum cordatum | Germany / North Sea | 1990 | |
| Prorocentrum cordatum | Latvia | 1988 | |
| Prorocentrum cordatum | Lithuania | 1992 | |
| Prorocentrum cordatum | Netherlands | To 2006 | |
| Prorocentrum cordatum | Norway / North Sea | 1979 | |
| Prorocentrum cordatum | Poland | 1989 | |
| Prorocentrum cordatum | Romania | 1948 | |
| Prorocentrum cordatum | Russia / Baltic Sea / Kaliningrad area | 2010 | |
| Prorocentrum cordatum | Russia / Baltic Sea / St. Petersburg area | 2000 - 2010 | |
| Prorocentrum cordatum | Russia / Black Sea | 1948 | |
| Prorocentrum cordatum | Sweden / Baltic Sea | 1982 | |
| Prorocentrum cordatum | Sweden / North Sea | 1979 | |
| Prorocentrum cordatum | Ukraine / Azov Sea | From 1948 | |
| Prorocentrum cordatum | Ukraine / Black Sea | From 1948 | |
| Prorocentrum cordatum | United Kingdom (Britain) / English Channel | 1976 | |
| Prorocentrum dentatum | Georgia | 2001 | |
| Prorocentrum dentatum | Ukraine / Black Sea | 1998 | |
| Prorocentrum emarginatum | Greece / Eastern Mediterranean | 2003 | |
| Prorocentrum gracile | Denmark / Baltic Sea | 1989 | |
| Prorocentrum gracile | Denmark / North Sea | 1989 | |
| Prorocentrum levis | Greece / Eastern Mediterranean | 2004 | |
| Prorocentrum lima | Denmark / Baltic Sea | 1989 | |
| Prorocentrum lima | Denmark / North Sea | 1989 | |
| Prorocentrum lima | France / Biscay Gulf | To 1987 | |
| Prorocentrum lima | France / English Channel | To 1987 | |
| Prorocentrum mexicanum | France / English Channel | 1995 | |
| Prorocentrum triestinum | Denmark / Baltic Sea | 1983 | |
| Prorocentrum triestinum | Denmark / North Sea | 1899 | |
| Prorocentrum triestinum | Germany / North Sea | 1992 | |
| Prorocentrum triestinum | Netherlands | 1961 | |
| Proterorhinus marmoratus | Russia / Baltic Sea / St. Petersburg area | 2006 | |
| Proterorhinus nasalis | Estonia | 2020 | |
| Proterorhinus nasalis | Finland | 2022 | |
| Protoceratium reticulatum | Netherlands | To 2014 | |
| Protocystis swerei | Ukraine / Black Sea | 1950 - 1959 | |
| Protodorvillea biarticulata | Greece / Central Mediterranean | 1983 | |
| Protodorvillea biarticulata | Greece / Eastern Mediterranean | 1975 | |
| Protodorvillea egena | Italy / Central Mediterranean | 2001 | |
| Protomonostroma undulatum | Denmark / Baltic Sea | 1973 | |
| Protomonostroma undulatum | Denmark / North Sea | 1973 | |
| Protomonostroma undulatum | Germany / North Sea | To 1954 | |
| Protoperidinium minutum | Georgia | 1999 | |
| Protoperidinium minutum | Russia / Black Sea | 2001 | |
| Protoperidinium parthenopes | Russia / Black Sea | 2001 | |
| Psammacoma gubernaculum | Israel | 2008 | |
| Psammoryctides moravicus | Belgium | To 2008 | |
| Pseudechidna brummeri | Portugal / Iberian Coastal | To 2023 | |
| Pseudo-nitzschia australis | France / Biscay Gulf | To 2013 | |
| Pseudo-nitzschia australis | France / English Channel | 2004 | |
| Pseudo-nitzschia calliantha | Turkey / Black Sea | 2007 - 2008 | |
| Pseudo-nitzschia calliantha | Ukraine / Black Sea | 2006 | |
| Pseudo-nitzschia inflatula | Ukraine / Black Sea | 1990 - 1999 | |
| Pseudo-nitzschia multistriata | France / Biscay Gulf | 2002 | |
| Pseudo-nitzschia multistriata | Portugal / Iberian Coastal | To 2003 | |
| Pseudo-nitzschia obtusa | Russia / Caspian Sea | 1990 | |
| Pseudo-nitzschia pungens | Russia / Black Sea | 2000 | |
| Pseudobacciger harengulae | Sweden / North Sea | 1994 | |
| Pseudobiceros stellae | Israel | 2016 | |
| Pseudoceros duplicinctus | Israel | 2015 | |
| Pseudochattonella farcimen | France / Biscay Gulf | 2012 | |
| Pseudochattonella farcimen | France / English Channel | 1994 | |
| Pseudochattonella farcimen | Germany / North Sea | To 1998 | |
| Pseudochattonella farcimen | Norway / North Sea | To 2010 | |
| Pseudochattonella farcimen | Poland | To 2001 | |
| Pseudochattonella verruculosa | Denmark / Baltic Sea | To 2015 | |
| Pseudochattonella verruculosa | Denmark / North Sea | 1998 | |
| Pseudochattonella verruculosa | Germany / North Sea | 1998 | |
| Pseudochattonella verruculosa | Greece / Central Mediterranean | 1998 | |
| Pseudochattonella verruculosa | Greece / Eastern Mediterranean | 2000 - 2001 | |
| Pseudochattonella verruculosa | Norway / North Sea | 1998 | |
| Pseudocuma (Stenocuma) graciloides | Russia / Baltic Sea / St. Petersburg area | 2004 | |
| Pseudodactylogyrus anguillae | Denmark / Baltic Sea | 1985 | |
| Pseudodactylogyrus anguillae | Denmark / North Sea | 1985 | |
| Pseudodactylogyrus anguillae | France / Biscay Gulf | 1984 | |
| Pseudodactylogyrus anguillae | France / Celtic seas | 1984 | |
| Pseudodactylogyrus anguillae | France / English Channel | 1984 | |
| Pseudodactylogyrus anguillae | France / North Sea | 1984 | |
| Pseudodactylogyrus anguillae | France / Western Mediterranean | 1984 | |
| Pseudodactylogyrus anguillae | Germany / North Sea | To 1995 | |
| Pseudodactylogyrus anguillae | Norway / North Sea | 1990 - 1999 | |
| Pseudodactylogyrus anguillae | Poland | 1985 | |
| Pseudodactylogyrus anguillae | Russia / Baltic Sea / Kaliningrad area | 2002 | |
| Pseudodactylogyrus anguillae | Sweden / North Sea | 1985 | |
| Pseudodactylogyrus bini | Germany / North Sea | To 1995 | |
| Pseudodactylogyrus bini | Norway / North Sea | 1990 - 1999 | |
| Pseudodactylogyrus bini | Poland | 1985 | |
| Pseudodiaptomus marinus | Belgium | 2015 | |
| Pseudodiaptomus marinus | Denmark / Baltic Sea | 2021 | |
| Pseudodiaptomus marinus | Denmark / North Sea | 2018 | |
| Pseudodiaptomus marinus | France / Biscay Gulf | 2010 | |
| Pseudodiaptomus marinus | France / English Channel | 2010 | |
| Pseudodiaptomus marinus | France / North Sea | 2010 | |
| Pseudodiaptomus marinus | France / Western Mediterranean | 2008 | |
| Pseudodiaptomus marinus | Germany / North Sea | 2011 | |
| Pseudodiaptomus marinus | Italy / Adriatic Sea | 2007 | |
| Pseudodiaptomus marinus | Italy / Central Mediterranean | 2008 | |
| Pseudodiaptomus marinus | Italy / Western Mediterranean | 2008 | |
| Pseudodiaptomus marinus | Netherlands | 2011 | |
| Pseudodiaptomus marinus | Portugal / Iberian Coastal | To 2020 | |
| Pseudodiaptomus marinus | Spain / Iberian Coastal | To 2020 | |
| Pseudodiaptomus marinus | United Kingdom (Britain) / English Channel | To 2011 | |
| Pseudolithoderma roscoffense | United Kingdom (Britain) / English Channel | 1973 | |
| Pseudominolia nedyma | Israel | 1966 | |
| Pseudomyicola spinosus | France / Biscay Gulf | 1963 | |
| Pseudomyicola spinosus | France / Celtic seas | 1963 | |
| Pseudomyicola spinosus | France / Western Mediterranean | 1951 | |
| Pseudonereis anomala | Greece / Central Mediterranean | 2003 | |
| Pseudonereis anomala | Greece / Eastern Mediterranean | 2003 | |
| Pseudonereis anomala | Israel | 1937 | |
| Pseudonereis anomala | Italy / Central Mediterranean | 2013 | |
| Pseudopolydora paucibranchiata | Australia / Bass strait | 1978 | |
| Pseudopolydora paucibranchiata | Faroe Islands | 1987 | |
| Pseudopolydora paucibranchiata | Greece / Eastern Mediterranean | 2005 | |
| Pseudopolydora paucibranchiata | Italy / Western Mediterranean | 1977 | |
| Pseudopolydora paucibranchiata | Netherlands | To 2015 | |
| Pseudopolydora paucibranchiata | Norway / North Sea | To 1979 | |
| Pseudopolydora paucibranchiata | Norway / Norwegian Sea | To 1991 | |
| Pseudopolydora paucibranchiata | Portugal / Iberian Coastal | 2005 | |
| Pseudopolydora paucibranchiata | Spain / Iberian Coastal | To 2011 | |
| Pseudopolydora paucibranchiata | United Kingdom (Britain) / Celtic seas | To 1960 | |
| Pseudorhaphitoma iodolabiata | Israel | 2010 | |
| Pseudosolenia calcar-avis | Bulgaria | 1926 | |
| Pseudosolenia calcar-avis | Denmark / Baltic Sea | 2009 | |
| Pseudosolenia calcar-avis | Denmark / North Sea | 2009 | |
| Pseudosolenia calcar-avis | Georgia | 1993 | |
| Pseudosolenia calcar-avis | Germany / Baltic Sea | To 2010 | |
| Pseudosolenia calcar-avis | Romania | 1900 - 1909 | |
| Pseudosolenia calcar-avis | Russia / Black Sea | 1926 | |
| Pseudosolenia calcar-avis | Russia / Caspian Sea | 1934 | |
| Pseudosolenia calcar-avis | Turkey / Black Sea | 1996 | |
| Pseudosolenia calcar-avis | Ukraine / Azov Sea | From 1924 | |
| Pseudosolenia calcar-avis | Ukraine / Black Sea | From 1924 | |
| Psiloteredo megotara | Belgium | To 1600 | |
| Psiloteredo megotara | Denmark / Baltic Sea | To 1944 | |
| Psiloteredo megotara | Denmark / North Sea | To 1937 | |
| Psiloteredo megotara | France / English Channel | To 1600 | |
| Psiloteredo megotara | France / North Sea | To 1600 | |
| Psiloteredo megotara | Germany / North Sea | To 1937 | |
| Psiloteredo megotara | Netherlands | To 1912 | |
| Psiloteredo megotara | Norway / North Sea | To 1962 | |
| Psiloteredo megotara | Norway / Norwegian Sea | To 1949 | |
| Psiloteredo megotara | Portugal / Azores | To 1940 | |
| Psiloteredo megotara | Portugal / Madeira | To 1940 | |
| Psiloteredo megotara | Sweden / North Sea | To 1977 | |
| Psiloteredo megotara | United Kingdom (Britain) / English Channel | To 1967 | |
| Psiloteredo megotara | United Kingdom (Britain) / North Sea / Orkney Islands | 1950 - 1955 | |
| Pteragogus trispilus | Greece / Central Mediterranean | 2008 - 2009 | |
| Pteragogus trispilus | Greece / Eastern Mediterranean | 1992 | |
| Pteragogus trispilus | Israel | 1991 | |
| Pteria hirundo | Romania | 2002 | |
| Pterocladiella capillacea | Australia / Bass strait | 1966 | |
| Pterocladiella melanoidea | Turkey / Black Sea | 1990 - 1999 | |
| Pterois miles | Greece / Central Mediterranean | 2018 | |
| Pterois miles | Greece / Eastern Mediterranean | 2009 | |
| Pterois miles | Israel | 1991 | |
| Pterois miles | Italy / Central Mediterranean | 2016 | |
| Pteropurpura (Ocinebrellus) inornata | France / Biscay Gulf | 1995 | |
| Pteropurpura (Ocinebrellus) inornata | France / Celtic seas | 1995 | |
| Pteropurpura (Ocinebrellus) inornata | Netherlands | 2007 | |
| Pteropurpura (Ocinebrellus) inornata | Portugal / Iberian Coastal | 1999 | |
| Pterosiphonia pinnulata | France / Biscay Gulf | 1993 | |
| Pterosiphonia pinnulata | France / English Channel | 1993 | |
| Pterosiphonia pinnulata | Portugal / Azores | 2005 - 2007 | |
| Pterosiphonia pinnulata | United Kingdom (Britain) / Celtic seas | | |
| Pterosiphonia pinnulata | United Kingdom (Britain) / English Channel | | |
| Pterosiphonia tanakae | France / Biscay Gulf | 2005 | |
| Pterosiphonia tanakae | France / English Channel | 2008 | |
| Pterosperma cristatum | Romania | 1970 | |
| Pterosperma cristatum | Ukraine / Black Sea | From 1948 | |
| Pterosperma joergenseni | Bulgaria | 1948 | |
| Pterosperma joergenseni | Romania | 1948 | |
| Pterosperma joergenseni | Ukraine / Black Sea | From 1948 | |
| Ptilohyale explorator | France / Biscay Gulf | 1989 | |
| Ptilohyale littoralis | Belgium | To 2018 | |
| Ptilohyale littoralis | France / English Channel | 2014 | |
| Ptilohyale littoralis | France / North Sea | 2014 | |
| Ptilohyale littoralis | Netherlands | 2009 | |
| Puellina innominata | Spain / Canary Islands | To 2003 | |
| Punctaria latifolia | Australia / Bass strait | 1971 | |
| Punctaria tenuissima | France / Western Mediterranean | 1970 | |
| Punctaria tenuissima | Turkey / Black Sea | 1993 | |
| Purpuradusta gracilis notata | Israel | 1981 | |
| Pycnoclavella taureanensis | Portugal / Madeira | To 1998 | |
| Pylaiella littoralis | Australia / Bass strait | 1971 | |
| Pylaiella littoralis | France / Biscay Gulf | 1964 | |
| Pylaiella littoralis | France / English Channel | 1964 | |
| Pylaiella littoralis | France / North Sea | 1984 | |
| Pylaiella littoralis | France / Western Mediterranean | 1985 | |
| Pylaiella littoralis | Greece / Central Mediterranean | 1975 | |
| Pylaiella littoralis | Greece / Eastern Mediterranean | 1967 | |
| Pylaiella littoralis | Turkey / Black Sea | 1998 | |
| Pyramimonas longicauda | Ukraine / Black Sea | From 2001 | |
| Pyrgulina fischeri | Israel | 1974 | |
| Pyrgulina nana | Israel | 2018 | |
| Pyrgulina pirinthella | Israel | 1984 | |
| Pyrgulina pupaeformis | Israel | 1935 | |
| Pyrodinium bahamense | Spain / Iberian Coastal | To 2008 | |
| Pyromaia tuberculata | Australia / Bass strait | 1995 | |
| Pyropia koreana | Greece / Eastern Mediterranean | 2000 | |
| Pyropia koreana | Israel | 2017 | |
| Pyropia leucosticta | Iceland | 1979 | |
| Pyropia njordii | Iceland | 2005 | |
| Pyropia yezoensis | France / Western Mediterranean | 1975 | |
| Pyropia yezoensis | Germany / North Sea | To 1984 | |
| Pyropia yezoensis | Italy / Adriatic Sea | 2010 | |
| Pyrunculus fourierii | Greece / Eastern Mediterranean | 2013 | |
| Pyrunculus fourierii | Israel | 1989 | |
| Pyura tessellata | Portugal / Azores | To 1971 | |
| Quistadrilus multisetosus | Belgium | To 1996 | |
| Rachycentron canadum | Israel | 1978 | |
| Radicilingua thysanorhizans | France / Western Mediterranean | 1969 | |
| Raeta pulchella | Australia / Bass strait | 1991 | |
| Rangia cuneata | Belgium | 2005 | |
| Rangia cuneata | Estonia | 2014 | |
| Rangia cuneata | Finland | 2021 | |
| Rangia cuneata | France / English Channel | 2017 | |
| Rangia cuneata | France / North Sea | 2005 | |
| Rangia cuneata | Germany / Baltic Sea | 2014 - 2015 | |
| Rangia cuneata | Germany / North Sea | 2013 | |
| Rangia cuneata | Lithuania | 2013 | |
| Rangia cuneata | Netherlands | To 2005 | |
| Rangia cuneata | Poland | 2011 | |
| Rangia cuneata | Russia / Baltic Sea / Kaliningrad area | 2010 | |
| Rangia cuneata | Sweden / Baltic Sea | 2016 | |
| Rapana venosa | Belgium | To 2006 | |
| Rapana venosa | Bulgaria | 1956 | |
| Rapana venosa | France / Biscay Gulf | 1997 | |
| Rapana venosa | France / Celtic seas | 1998 | |
| Rapana venosa | France / Western Mediterranean | 2015 | |
| Rapana venosa | Georgia | 1947 | |
| Rapana venosa | Greece / Eastern Mediterranean | 1986 | |
| Rapana venosa | Italy / Adriatic Sea | 1973 | |
| Rapana venosa | Italy / Central Mediterranean | To 2006 | |
| Rapana venosa | Italy / Western Mediterranean | 1978 | |
| Rapana venosa | Netherlands | 2005 | |
| Rapana venosa | Romania | From 1961 | |
| Rapana venosa | Russia / Black Sea | 1946 | |
| Rapana venosa | Spain / Iberian Coastal | 2007 | |
| Rapana venosa | Turkey / Black Sea | 1960 | |
| Rapana venosa | Ukraine / Black Sea | From 1954 | |
| Rapana venosa | United Kingdom (Britain) / North Sea | 2005 | |
| Rastrelliger kanagurta | Israel | 1967 | |
| Rathkea octopunctata | Romania | From 1959 | |
| Redicirce sulcata | Israel | 1970 | |
| Reptadeonella violacea | Portugal / Iberian Coastal | 2012 | |
| Reptadeonella violacea | Portugal / Madeira | To 2013 | |
| Reptadeonella violacea | Spain / Canary Islands | To 2003 | |
| Reteporella jermanensis | Israel | 1974 | |
| Retusa desgenettii | Israel | 1997 | |
| Rhabdosargus haffara | Israel | 1991 | |
| Rhincalanus sp. | Ukraine / Black Sea | From 1997 | |
| Rhinoclavis kochi | Greece / Eastern Mediterranean | 2015 | |
| Rhinoclavis kochi | Israel | 1963 | |
| Rhinoclavis sinensis | Israel | 2003 | |
| Rhithropanopeus harrisii | Belgium | 1985 | |
| Rhithropanopeus harrisii | Bulgaria | 1934 | |
| Rhithropanopeus harrisii | Denmark / Baltic Sea | 1953 | |
| Rhithropanopeus harrisii | Denmark / North Sea | 1953 | |
| Rhithropanopeus harrisii | Estonia | 2011 | |
| Rhithropanopeus harrisii | Finland | 2009 | |
| Rhithropanopeus harrisii | France / Biscay Gulf | 1955 | |
| Rhithropanopeus harrisii | France / Celtic seas | 1959 | |
| Rhithropanopeus harrisii | France / English Channel | 1955 | |
| Rhithropanopeus harrisii | France / North Sea | 1950 | |
| Rhithropanopeus harrisii | France / Western Mediterranean | To 2001 | |
| Rhithropanopeus harrisii | Germany / Baltic Sea | 1948 - 1950 | |
| Rhithropanopeus harrisii | Germany / North Sea | 1910 - 1914 | |
| Rhithropanopeus harrisii | Italy / Adriatic Sea | 1993 | |
| Rhithropanopeus harrisii | Italy / Western Mediterranean | 2013 | |
| Rhithropanopeus harrisii | Latvia | 2013 | |
| Rhithropanopeus harrisii | Lithuania | 2001 | |
| Rhithropanopeus harrisii | Netherlands | 1874 | |
| Rhithropanopeus harrisii | Poland | 1951 | |
| Rhithropanopeus harrisii | Portugal / Iberian Coastal | To 1978 | |
| Rhithropanopeus harrisii | Romania | From 1951 | |
| Rhithropanopeus harrisii | Russia / Azov Sea | 1950 | |
| Rhithropanopeus harrisii | Russia / Baltic Sea / Kaliningrad area | 1950 | |
| Rhithropanopeus harrisii | Spain / Iberian Coastal | To 1991 | |
| Rhithropanopeus harrisii | Sweden / Baltic Sea | 2014 | |
| Rhithropanopeus harrisii | Ukraine / Black Sea | 1937 - 1948 | |
| Rhithropanopeus harrisii | United Kingdom (Britain) / Celtic seas | 1996 | |
| Rhizogeton nudus | Iceland | To 2010 | |
| Rhizogeton nudus | Norway / Barents Sea | To 1998 | |
| Rhizogeton nudus | United Kingdom (Britain) / North Sea | To 2010 | |
| Rhizosolenia setigera | Bulgaria | 1987 | |
| Rhizosolenia setigera | Georgia | 1989 | |
| Rhizosolenia setigera | Romania | 1987 | |
| Rhodophysema georgei | France / Western Mediterranean | 1978 | |
| Rhodosoma turcicum | Israel | 2004 | |
| Rhopilema nomadica | Greece / Central Mediterranean | 2006 | |
| Rhopilema nomadica | Greece / Eastern Mediterranean | 2017 | |
| Rhopilema nomadica | Israel | 1976 | |
| Rhopilema nomadica | Italy / Central Mediterranean | 2015 | |
| Rhopilema nomadica | Italy / Western Mediterranean | 2015 | |
| Rhynchoconger trewavasae | Israel | 1987 | |
| Rissoina bertholleti | Israel | 1958 | |
| Rissoina spirata | Israel | 1997 | |
| Robertgurneya ecaudata | Ukraine / Black Sea | 1969 | |
| Robertgurneya rostrata | Turkey / Black Sea | 2009 | |
| Robertgurneya rostrata | Ukraine / Black Sea | From 1964 | |
| Ruditapes decussatus | Portugal / Azores | To 1900 | |
| Ruditapes philippinarum | Belgium | To 2006 | |
| Ruditapes philippinarum | France / Biscay Gulf | 1976 | |
| Ruditapes philippinarum | France / Celtic seas | 1979 | |
| Ruditapes philippinarum | France / English Channel | 1973 | |
| Ruditapes philippinarum | France / North Sea | 2009 | |
| Ruditapes philippinarum | France / Western Mediterranean | 1981 | |
| Ruditapes philippinarum | Germany / North Sea | 2016 | |
| Ruditapes philippinarum | Ireland | 1982 | |
| Ruditapes philippinarum | Italy / Adriatic Sea | 1983 | |
| Ruditapes philippinarum | Italy / Central Mediterranean | 1983 - 1990 | |
| Ruditapes philippinarum | Italy / Western Mediterranean | 1985 | |
| Ruditapes philippinarum | Netherlands | To 2008 | |
| Ruditapes philippinarum | Norway / North Sea | 1987 | |
| Ruditapes philippinarum | Norway / Norwegian Sea | 1987 | |
| Ruditapes philippinarum | Portugal / Iberian Coastal | To 1984 | |
| Ruditapes philippinarum | Romania | 1985 | |
| Ruditapes philippinarum | Russia / Black Sea | 1985 | |
| Ruditapes philippinarum | Spain / Iberian Coastal | To 2005 | |
| Ruditapes philippinarum | United Kingdom (Britain) / Celtic seas | 1980 | |
| Ruditapes philippinarum | United Kingdom (Britain) / English Channel | 1980 | |
| Ruditapes philippinarum | United Kingdom (Britain) / North Sea | 1981 - 1987 | |
| Rugalucina angela | Israel | 2016 | |
| Rugulopteryx okamurae | France / Western Mediterranean | 2002 | |
| Rugulopteryx okamurae | Portugal / Iberian Coastal | 2021 | |
| Sabella spallanzanii | Australia / Bass strait | 1984 | |
| Sabella spallanzanii | New Zealand / New Zealand Shelf / North Island | 2009 | |
| Sabella spallanzanii | New Zealand / New Zealand Shelf / South Island | 2008 | |
| Sabella spallanzanii | Portugal / Azores | To 1954 | |
| Sabella spallanzanii | Spain / Iberian Coastal | To 2003 | |
| Sabellaria spinulosa | Netherlands | 1938 | |
| Sabia conica | Israel | 1980 | |
| Saccharina japonica | France / Western Mediterranean | 1976 | |
| Saccharina japonica | Germany / North Sea | To 1980 | |
| Saccostrea glomerata | Italy / Adriatic Sea | 1984 | |
| Saduria entomon | Ukraine / Black Sea | 2009 | |
| Salmo salar | Turkey / Black Sea | 1992 | |
| Salpingella decurtata | Romania | 2012 | |
| Salpingella decurtata | Ukraine / Black Sea | 2002 | |
| Salpingella sp. | Ukraine / Black Sea | From 2002 | |
| Salvelinus fontinalis | Denmark / Baltic Sea | 1916 | |
| Salvelinus fontinalis | Denmark / North Sea | 1916 | |
| Salvelinus fontinalis | Finland | 1890 - 1899 | |
| Salvelinus fontinalis | Sweden / Baltic Sea | 1892 | |
| Salvelinus namaycush | Finland | 1960 - 1969 | |
| Salvelinus namaycush | Sweden / Baltic Sea | 1958 | |
| Sander lucioperca | Portugal / Azores | To 2004 | |
| Sarcodiotheca gaudichaudii | United Kingdom (Britain) / English Channel | 1974 | |
| Sarconema filiforme | Israel | 1945 | |
| Sarconema scinaioides | Greece / Eastern Mediterranean | 1980 | |
| Sardinella aurita | Bulgaria | 1980 - 1989 | |
| Sardinella aurita | Georgia | 1937 | |
| Sardinella aurita | Romania | 1980 - 1989 | |
| Sardinella aurita | Russia / Black Sea | 1980 - 1989 | |
| Sardinella aurita | Turkey / Black Sea | 1997 | |
| Sardinella aurita | Ukraine / Black Sea | From 1999 | |
| Sardinella gibbosa | Israel | 2008 | |
| Sargassum hornschuchii | Turkey / Black Sea | 1990 - 1999 | |
| Sargassum muticum | Belgium | 1999 | |
| Sargassum muticum | Denmark / Baltic Sea | 1984 | |
| Sargassum muticum | Denmark / North Sea | 1984 | |
| Sargassum muticum | France / Biscay Gulf | 1975 | |
| Sargassum muticum | France / Celtic seas | 1976 | |
| Sargassum muticum | France / English Channel | 1975 | |
| Sargassum muticum | France / North Sea | 1979 | |
| Sargassum muticum | France / Western Mediterranean | 1980 | |
| Sargassum muticum | Germany / North Sea | 1988 | |
| Sargassum muticum | Ireland | To 1995 | |
| Sargassum muticum | Italy / Adriatic Sea | 1992 | |
| Sargassum muticum | Netherlands | 1977 | |
| Sargassum muticum | Norway / North Sea | 1988 | |
| Sargassum muticum | Portugal / Iberian Coastal | 1989 | |
| Sargassum muticum | Spain / Iberian Coastal | 1985 | |
| Sargassum muticum | Sweden / Baltic Sea | To 2005 | |
| Sargassum muticum | Sweden / North Sea | 1985 | |
| Sargassum muticum | United Kingdom (Britain) / Celtic seas | 1971 | |
| Sargassum muticum | United Kingdom (Britain) / English Channel | 1971 | |
| Sargassum muticum | United Kingdom (Britain) / North Sea | 1981 | |
| Sargassum muticum | United Kingdom (Britain) / North Sea / Orkney Islands | To 2015 | |
| Sargocentron rubrum | Greece / Central Mediterranean | 2017 | |
| Sargocentron rubrum | Greece / Eastern Mediterranean | 1947 | |
| Sargocentron rubrum | Israel | 1945 | |
| Saron marmoratus | Israel | 2013 | |
| Sarpa salpa | Bulgaria | 1949 | |
| Sarpa salpa | Georgia | 1938 | |
| Sarpa salpa | Romania | 1949 | |
| Sarpa salpa | Turkey / Black Sea | 1998 | |
| Sarpa salpa | Ukraine / Black Sea | From 1999 | |
| Sarsameira parva | Turkey / Black Sea | 2009 | |
| Sarsamphiascus parvus | Russia / Black Sea | 1999 | |
| Saurida lessepsianus | Greece / Central Mediterranean | 1990 | |
| Saurida lessepsianus | Greece / Eastern Mediterranean | 1940 - 1945 | |
| Saurida lessepsianus | Israel | 1952 | |
| Savoryella lignicola | Ukraine / Black Sea | From 2001 | |
| Scageliopsis patens | Portugal / Azores | To 1989 | |
| Scageliopsis patens | Portugal / Iberian Coastal | From 2006 | |
| Scageliopsis patens | Spain / Iberian Coastal | To 2008 | |
| Scaliola elata | Israel | 1987 | |
| Scartella cristata | Denmark / Baltic Sea | 1934 | |
| Scarus ghobban | Greece / Eastern Mediterranean | 2014 | |
| Scarus ghobban | Israel | 2001 | |
| Scherocumella gurneyi | Israel | 2005 | |
| Schizobrachiella verrilli | Belgium | To 1905 | |
| Schizobrachiella verrilli | Germany / North Sea | 2011 - 2012 | |
| Schizobrachiella verrilli | Netherlands | To 2015 | |
| Schizoporella errata | Portugal / Azores | 2013 | |
| Schizoporella errata | Portugal / Iberian Coastal | 2016 | |
| Schizoporella errata | Portugal / Madeira | 1897 | |
| Schizoporella errata | Spain / Canary Islands | To 2003 | |
| Schizoporella japonica | Denmark / North Sea | 2021 | |
| Schizoporella japonica | Germany / North Sea | 2018 | |
| Schizoporella japonica | Ireland | To 2015 | |
| Schizoporella japonica | Netherlands | To 2018 | |
| Schizoporella japonica | Norway / Norwegian Sea | From 2014 | |
| Schizoporella japonica | Spain / Spain | 2017 | |
| Schizoporella japonica | United Kingdom (Britain) / North Sea / Orkney Islands | From 2011 | |
| Schizoporella pungens | Portugal / Madeira | 2010 | |
| Schizoporella unicornis | Australia / Bass strait | 1802 - 1880 | |
| Schizoporella unicornis | France / English Channel | 2000 | |
| Schizoporella unicornis | France / North Sea | 2000 | |
| Schizoporella unicornis | Portugal / Azores | From 2009 | |
| Schizoporella unicornis | Spain / Canary Islands | To 2003 | |
| Schottera nicaeensis | Australia / Bass strait | 1975 | |
| Schyzocotyle acheilognathi | Norway / Norwegian Sea | To 2012 | |
| Sciaenops ocellatus | China / Yellow Sea | To 2001 | |
| Sciaenops ocellatus | Israel | 1999 | |
| Sciaenops ocellatus | Italy / Central Mediterranean | 2016 | |
| Scolecetrix sp. | Ukraine / Black Sea | From 2001 | |
| Scolionema suvaense | Italy / Western Mediterranean | 1972 | |
| Scomberomorus commerson | Greece / Central Mediterranean | 2017 | |
| Scomberomorus commerson | Greece / Eastern Mediterranean | 2008 | |
| Scomberomorus commerson | Israel | 1935 | |
| Scrippsiella acuminata | Bulgaria | 1989 | |
| Scrippsiella acuminata | Georgia | 1985 | |
| Scrippsiella acuminata | Netherlands | To 2018 | |
| Scrippsiella acuminata | Romania | 1982 | |
| Scrippsiella acuminata | Russia / Black Sea | 2001 | |
| Scrippsiella acuminata | Turkey / Black Sea | 1990 - 1999 | |
| Scrippsiella acuminata | Ukraine / Black Sea | 1960 - 1969 | |
| Scrippsiella operosa | Bulgaria | 2008 | |
| Scruparia ambigua | Australia / Bass strait | 1881 | |
| Scruparia ambigua | Spain / Canary Islands | To 2003 | |
| Scrupocellaria scrupea | Australia / Bass strait | 1887 | |
| Scrupocellaria scruposa | Australia / Bass strait | From 1900 | |
| Scrupocellaria scruposa | Greece / Eastern Mediterranean | 1967 | |
| Scyllarus caparti | Italy / Adriatic Sea | 1977 | |
| Scytosiphon dotyi | France / Western Mediterranean | 1994 | |
| Scytosiphon dotyi | Greece / Eastern Mediterranean | 2013 | |
| Scytosiphon dotyi | Italy / Adriatic Sea | 1960 - 1977 | |
| Scytosiphon dotyi | Portugal / Iberian Coastal | 2016 | |
| Scytosiphon dotyi | Spain / Canary Islands | To 2004 | |
| Scytosiphon dotyi | Spain / Iberian Coastal | To 1998 | |
| Scytosiphon dotyi | United Kingdom (Britain) / North Sea | 1900 | |
| Scytosiphon lomentaria | Australia / Bass strait | 1971 | |
| Sebastes schlegelii | Belgium | 2008 | |
| Sebastes schlegelii | Netherlands | 2008 | |
| Sebastiscus marmoratus | Norway / North Sea | 2016 | |
| Sepia pharaonis | Israel | 2003 | |
| Sepioteuthis lessoniana | Greece / Eastern Mediterranean | 2009 | |
| Sepioteuthis lessoniana | Israel | 2004 | |
| Septifer cumingii | Greece / Eastern Mediterranean | 2010 | |
| Septifer cumingii | Israel | 2007 | |
| Serranus hepatus | Turkey / Black Sea | 2012 | |
| Sertularia marginata | Greece / Eastern Mediterranean | 1990 | |
| Sertularia marginata | Israel | 1949 | |
| Sertularia marginata | Spain / Iberian Coastal | To 1991 | |
| Sicyonia lancifer | Israel | 2015 | |
| Sigambra tentaculata | Georgia | 1978 | |
| Sigambra tentaculata | Ukraine / Black Sea | 1960 - 1969 | |
| Siganus fuscescens | Italy / Western Mediterranean | 2020 | |
| Siganus luridus | France / Western Mediterranean | 2008 | |
| Siganus luridus | Greece / Adriatic Sea | 2014 | |
| Siganus luridus | Greece / Central Mediterranean | 1973 | |
| Siganus luridus | Greece / Eastern Mediterranean | 1964 | |
| Siganus luridus | Israel | 1955 | |
| Siganus luridus | Italy / Adriatic Sea | 2010 | |
| Siganus luridus | Italy / Central Mediterranean | 2003 | |
| Siganus luridus | Italy / Western Mediterranean | 2004 | |
| Siganus rivulatus | France / Western Mediterranean | 2018 | |
| Siganus rivulatus | Greece / Adriatic Sea | 2014 | |
| Siganus rivulatus | Greece / Central Mediterranean | 2007 | |
| Siganus rivulatus | Greece / Eastern Mediterranean | 1925 | |
| Siganus rivulatus | Israel | 1924 | |
| Siganus rivulatus | Italy / Central Mediterranean | 2015 | |
| Silhouettea aegyptia | Israel | 1998 | |
| Sillago suezensis | Greece / Eastern Mediterranean | 2018 | |
| Sillago suezensis | Israel | 1977 | |
| Sinanodonta woodiana | Belgium | To 1999 | |
| Sinanodonta woodiana | Ukraine / Black Sea | 1999 - 2000 | |
| Sinelobus stanfordi | Belgium | 2006 | |
| Sinelobus stanfordi | France / North Sea | 2016 | |
| Sinelobus stanfordi | Germany / Baltic Sea | 2012 | |
| Sinelobus stanfordi | Germany / North Sea | To 2012 | |
| Sinelobus stanfordi | Latvia | 2015 | |
| Sinelobus stanfordi | Netherlands | 2006 | |
| Sinelobus vanhaareni | Belgium | To 2007 | |
| Sinelobus vanhaareni | Denmark / Baltic Sea | 2021 | |
| Sinelobus vanhaareni | Denmark / North Sea | 2021 | |
| Sinelobus vanhaareni | Estonia | 2010 | |
| Sinelobus vanhaareni | Finland | From 2016 | |
| Sinelobus vanhaareni | Germany / Baltic Sea | 2012 | |
| Sinelobus vanhaareni | Germany / North Sea | 2009 | |
| Sinelobus vanhaareni | Poland | 2014 | |
| Sinelobus vanhaareni | Sweden / North Sea | 2020 | |
| Sinotaia quadrata | France / Biscay Gulf | 2017 | |
| Sinotaia quadrata | Spain / Iberian Coastal | 2017 | |
| Siphonaria crenata | Israel | 1965 | |
| Siphonaria pectinata | Greece / Eastern Mediterranean | 1973 | |
| Sirpus monodi | Greece / Central Mediterranean | 2006 | |
| Sirpus monodi | Greece / Eastern Mediterranean | 2002 | |
| Sirpus zariquieyi | Turkey / Black Sea | 1982 | |
| Skeletonema subsalsum | Ukraine / Black Sea | From 1993 | |
| Skistodiaptomus pallidus | Germany / North Sea | To 2010 | |
| Smaragdia souverbiana | Greece / Central Mediterranean | 2012 | |
| Smaragdia souverbiana | Greece / Eastern Mediterranean | 1993 | |
| Smaragdia souverbiana | Israel | 1987 | |
| Smittina nitidissima | Israel | 1986 | |
| Smittina nitidissima | Italy / Central Mediterranean | 2014 | |
| Smittoidea prolifica | Germany / North Sea | 2011 | |
| Smittoidea prolifica | Netherlands | 1995 | |
| Solieria chordalis | United Kingdom (Britain) / Celtic seas | 1976 | |
| Solieria chordalis | United Kingdom (Britain) / English Channel | 1976 | |
| Solieria dura | Israel | 1954 | |
| Solieria filiformis | Australia / Bass strait | 1957 | |
| Solieria filiformis | France / Western Mediterranean | 1999 | |
| Solieria filiformis | Italy / Adriatic Sea | 2003 | |
| Solieria filiformis | Italy / Central Mediterranean | 1922 | |
| Solieria filiformis | United Kingdom (Britain) / English Channel | 1978 | |
| Solmundella bitentaculata | Turkey / Black Sea | 2010 | |
| Sorites orbiculus | Italy / Central Mediterranean | 2005 | |
| Sorites orbiculus | Turkey / Black Sea | 2010 | |
| Sorsogona prionota | Israel | 1946 | |
| Sousa plumbea | Greece / Eastern Mediterranean | 2017 | |
| Spartina alterniflora | France / Biscay Gulf | 1806 | |
| Spartina alterniflora | France / Celtic seas | 1960 | |
| Spartina alterniflora | France / English Channel | 1960 | |
| Spartina densiflora | Portugal / Iberian Coastal | 1986 | |
| Spartina densiflora | Spain / Iberian Coastal | 1950 - 1959 | |
| Spartina patens | France / Biscay Gulf | 1901 | |
| Spartina patens | France / Celtic seas | 1901 | |
| Spartina patens | France / Western Mediterranean | 1849 | |
| Spartina patens | Portugal / Iberian Coastal | 1999 | |
| Spartina patens | Spain / Iberian Coastal | To 1997 | |
| Spartina townsendii var. anglica | Belgium | 1920 - 1929 | |
| Spartina townsendii var. anglica | Denmark / Baltic Sea | 1948 - 1953 | |
| Spartina townsendii var. anglica | Denmark / North Sea | 1930 - 1940 | |
| Spartina townsendii var. anglica | France / Biscay Gulf | 1924 | |
| Spartina townsendii var. anglica | France / Celtic seas | 1894 | |
| Spartina townsendii var. anglica | France / English Channel | 1894 | |
| Spartina townsendii var. anglica | France / North Sea | To 1990 | |
| Spartina townsendii var. anglica | Germany / North Sea | 1927 | |
| Spartina townsendii var. anglica | Ireland | 1925 | |
| Spartina townsendii var. anglica | Netherlands | 1924 | |
| Spartina townsendii var. anglica | Sweden / North Sea | From 2007 | |
| Spartina townsendii var. anglica | United Kingdom (Britain) / Celtic seas | 1850 - 1859 | |
| Spartina townsendii var. anglica | United Kingdom (Britain) / English Channel | 1850 - 1859 | |
| Spartina x neyrauti | France / Biscay Gulf | 1897 | |
| Spartina x townsendii | France / Biscay Gulf | 1906 - 1910 | |
| Spartina x townsendii | France / Celtic seas | 1906 | |
| Spartina x townsendii | France / English Channel | 1906 | |
| Spartina x townsendii | France / North Sea | 2000 - 2010 | |
| Spartina x townsendii | Ireland | 1930 - 1934 | |
| Sparus aurata | Bulgaria | 1940 - 1949 | |
| Sparus aurata | Georgia | 1937 | |
| Sparus aurata | Portugal / Madeira | To 2002 | |
| Sparus aurata | Romania | 1940 - 1949 | |
| Sparus aurata | Turkey / Black Sea | 1942 | |
| Sparus aurata | Ukraine / Black Sea | 1987 | |
| Spatoglossum asperum | Israel | 1962 | |
| Spatulodinium pseudonoctiluca | Ukraine / Black Sea | From 2001 | |
| Spermothamnion cymosum | Italy / Adriatic Sea | 2010 | |
| Sphacelaria fusca | Australia / Bass strait | 1977 | |
| Sphaerococcus coronopifolius | Norway / North Sea | 1994 | |
| Sphaerococcus coronopifolius | Sweden / North Sea | To 1994 | |
| Sphaeroma serratum | Portugal / Azores | To 1990 | |
| Sphaeroma walkeri | France / Western Mediterranean | 1977 | |
| Sphaeroma walkeri | Greece / Eastern Mediterranean | 2015 | |
| Sphaeroma walkeri | Israel | 1971 | |
| Sphaeroma walkeri | Italy / Western Mediterranean | 2010 | |
| Sphaeroma walkeri | Portugal / Madeira | From 2015 | |
| Sphaeroma walkeri | Romania | 2004 | |
| Sphaerotrichia divaricata | France / Western Mediterranean | 1981 | |
| Sphaerotrichia divaricata | Portugal / Azores | 1991 | |
| Sphaerotrichia firma | France / Western Mediterranean | 1980 | |
| Sphenia rueppellii | Israel | 1978 | |
| Sphoeroides pachygaster | France / Western Mediterranean | 1991 | |
| Sphyraena chrysotaenia | Greece / Central Mediterranean | 2011 | |
| Sphyraena chrysotaenia | Greece / Eastern Mediterranean | 1995 | |
| Sphyraena flavicauda | Greece / Eastern Mediterranean | 2003 | |
| Sphyraena flavicauda | Israel | 1991 | |
| Sphyraena obtusata | Ukraine / Black Sea | From 1999 | |
| Sphyraena pinguis | Israel | 1931 | |
| Sphyrna zygaena | Romania | 1950 - 1959 | |
| Spirobranchus latiscapus | Spain / Iberian Coastal | To 2017 | |
| Spirobranchus tetraceros | Greece / Eastern Mediterranean | 1970 | |
| Spirobranchus tetraceros | Israel | 1976 | |
| Spirobranchus tetraceros | Italy / Central Mediterranean | 2016 | |
| Spirorbis (Spirorbis) marioni | France / Western Mediterranean | 1977 | |
| Spirorbis (Spirorbis) marioni | Greece / Eastern Mediterranean | 1997 | |
| Spirorbis (Spirorbis) marioni | Italy / Western Mediterranean | 1977 | |
| Spirorbis (Spirorbis) marioni | Portugal / Azores | To 1979 | |
| Spirorbis (Spirorbis) marioni | Portugal / Madeira | To 1995 | |
| Spirorbis (Spirorbis) marioni | Spain / Canary Islands | To 1980 | |
| Spisula solidissima | Netherlands | 1982 | |
| Spondylus nicobaricus | Israel | 2002 | |
| Spondylus spinosus | Greece / Eastern Mediterranean | 2008 - 2013 | |
| Spondylus spinosus | Israel | 1992 | |
| Spongoclonium caribaeum | France / Celtic seas | 1967 | |
| Spongoclonium caribaeum | France / English Channel | 1967 | |
| Spongoclonium caribaeum | France / Western Mediterranean | 1974 | |
| Spongoclonium caribaeum | Portugal / Azores | 2005 - 2007 | |
| Spongoclonium caribaeum | Spain / Canary Islands | 1970 - 1979 | |
| Spratelloides delicatulus | Israel | 1973 | |
| Spyridia hypnoides | Israel | 1937 | |
| Stenothoe georgiana | Italy / Adriatic Sea | 2017 | |
| Stenothoe georgiana | Italy / Central Mediterranean | 2016 | |
| Stenothoe georgiana | Italy / Western Mediterranean | 2013 | |
| Stephanolepis diaspros | Greece / Central Mediterranean | 2016 | |
| Stephanolepis diaspros | Greece / Eastern Mediterranean | 1943 | |
| Stephanolepis diaspros | Israel | 1925 | |
| Stephanolepis diaspros | Italy / Central Mediterranean | 1967 | |
| Stephanolepis diaspros | Italy / Western Mediterranean | 1983 | |
| Stephanopyxis palmeriana | Belgium | To 2006 | |
| Stephanopyxis palmeriana | Germany / North Sea | 1990 | |
| Stephanopyxis palmeriana | Netherlands | To 2006 | |
| Stephanopyxis palmeriana | Sweden / North Sea | To 2006 | |
| Stephanopyxis turris | Iceland | 1997 | |
| Stephos cryptospinosus | France / Biscay Gulf | 2010 | |
| Stephos marsalensis | France / Biscay Gulf | To 2014 | |
| Sternaspis scutata | United Kingdom (Britain) / English Channel | 1986 | |
| Sternodromia spinirostris | Italy / Central Mediterranean | 1969 - 1972 | |
| Sticteulima lentiginosa | Israel | 2004 | |
| Stictyosiphon soriferus | Australia / Bass strait | 1969 | |
| Stolephorus indicus | Israel | 2015 | |
| Stolephorus insularis | Israel | 2009 | |
| Stramonita haemastoma | France / English Channel | 2018 | |
| Stratiotes aloides | Ireland | From 1836 | |
| Streblosoma pseudocomatus | Italy / Western Mediterranean | 1981 | |
| Streblospio benedicti | Denmark / North Sea | To 2017 | |
| Streblospio benedicti | France / Biscay Gulf | 1982 | |
| Streblospio benedicti | France / Celtic seas | 1982 | |
| Streblospio benedicti | France / English Channel | 2009 | |
| Streblospio benedicti | France / North Sea | 2009 | |
| Streblospio benedicti | Germany / North Sea | To 2006 | |
| Streblospio benedicti | Netherlands | To 2006 | |
| Streblospio benedicti | Russia / Baltic Sea / Kaliningrad area | 1997 | |
| Streblospio eridani | Italy / Adriatic Sea | 2016 - 2017 | |
| Streblospio gynobranchiata | Romania | 2011 | |
| Streblospio gynobranchiata | Russia / Black Sea | 2001 | |
| Streptosyllis varians | Bulgaria | 1966 | |
| Strongylocentrotus intermedius | China / Yellow Sea | To 2001 | |
| Styela canopus | France / Western Mediterranean | 2019 | |
| Styela canopus | Portugal / Iberian Coastal | 2015 | |
| Styela canopus | Portugal / Madeira | 2006 | |
| Styela clava | Australia / Bass strait | 1976 | |
| Styela clava | Belgium | To 1986 | |
| Styela clava | Canada / South-eastern Scotian Shelf | 2012 | |
| Styela clava | Canada / Southern Gulf of St. Lawrence and Eastern Scotian Shelf | 1998 | |
| Styela clava | Denmark / Baltic Sea | 1981 | |
| Styela clava | Denmark / North Sea | 1981 | |
| Styela clava | France / Biscay Gulf | 1979 | |
| Styela clava | France / Celtic seas | 1968 | |
| Styela clava | France / English Channel | 1968 | |
| Styela clava | France / North Sea | 1970 | |
| Styela clava | France / Western Mediterranean | 2004 | |
| Styela clava | Germany / Baltic Sea | 2017 | |
| Styela clava | Germany / North Sea | 1997 | |
| Styela clava | Ireland | To 1971 | |
| Styela clava | Italy / Adriatic Sea | 2021 | |
| Styela clava | Netherlands | 1974 | |
| Styela clava | Norway / North Sea | To 2011 | |
| Styela clava | Portugal / Iberian Coastal | To 2003 | |
| Styela clava | Romania | 2004 | |
| Styela clava | Spain / Iberian Coastal | To 2005 | |
| Styela clava | Sweden / North Sea | To 2023 | |
| Styela clava | United Kingdom (Britain) / Celtic seas | 1953 | |
| Styela clava | United Kingdom (Britain) / English Channel | 1953 | |
| Styela clava | United Kingdom (Britain) / North Sea | To 1998 | |
| Styela clava | United Kingdom (Britain) / North Sea / Orkney Islands | 2020 | |
| Styela plicata | Australia / Bass strait | 1966 | |
| Styela plicata | France / Western Mediterranean | 1950 | |
| Styela plicata | Greece / Eastern Mediterranean | 1968 | |
| Styela plicata | Israel | 1955 | |
| Styela plicata | Italy / Adriatic Sea | 1953 - 1955 | |
| Styela plicata | Italy / Central Mediterranean | 1972 - 1982 | |
| Styela plicata | Italy / Western Mediterranean | 1822 - 1830 | |
| Styela plicata | Portugal / Azores | To 2010 | |
| Styela plicata | Portugal / Iberian Coastal | To 2009 | |
| Styela plicata | Portugal / Madeira | 1992 | |
| Styela plicata | Spain / Iberian Coastal | To 2016 | |
| Stylocheiron sp. | Romania | 1978 | |
| Stylochus flevensis | Netherlands | 1921 | |
| Stylonema alsidii | Australia / Bass strait | 1977 | |
| Stylonema cornu-cervi | Turkey / Black Sea | 2000 - 2009 | |
| Stypopodium schimperi | Greece / Central Mediterranean | 2008 | |
| Stypopodium schimperi | Greece / Eastern Mediterranean | 1994 | |
| Stypopodium schimperi | Israel | 1995 | |
| Stypopodium schimperi | Spain / Canary Islands | To 2002 | |
| Suberites massa | Netherlands | To 1989 | |
| Suberites massa | United Kingdom (Britain) / English Channel | | |
| Suberites massa | United Kingdom (Britain) / North Sea | To 2002 | |
| Sycon raphanus | USA / California Current | 2012 | |
| Sycon scaldiense | Netherlands | To 1975 | |
| Syllidia armata | Netherlands | 1943 | |
| Syllis gracilis | Netherlands | 1940 | |
| Syllis hyllebergi | France / Western Mediterranean | 2019 | |
| Syllis hyllebergi | Italy / Adriatic Sea | 2014 | |
| Syllis hyllebergi | Italy / Central Mediterranean | 2008 | |
| Syllis hyllebergi | Italy / Western Mediterranean | 2008 | |
| Syllis pectinans | Italy / Adriatic Sea | 2013 | |
| Syllis pectinans | Italy / Western Mediterranean | 2013 | |
| Syllis pectinans | Spain / Iberian Coastal | To 2017 | |
| Symphyocladia marchantioides | Italy / Western Mediterranean | 1984 | |
| Symphyocladia marchantioides | Portugal / Azores | 1971 | |
| Symphyocladia marchantioides | Portugal / Iberian Coastal | From 2003 | |
| Symphyocladiella dendroidea | France / Biscay Gulf | 2005 | |
| Symphyocladiella dendroidea | France / Celtic seas | 2018 | |
| Symphyocladiella dendroidea | France / English Channel | 2022 | |
| Symphyocladiella dendroidea | France / Western Mediterranean | 1995 | |
| Symplegma brakenhielmi | Greece / Eastern Mediterranean | 2015 | |
| Symplegma brakenhielmi | Israel | 1951 | |
| Symplegma brakenhielmi | Italy / Central Mediterranean | 2016 | |
| Symplegma brakenhielmi | Italy / Western Mediterranean | 2014 | |
| Symplegma brakenhielmi | Portugal / Madeira | From 2015 | |
| Synagrops japonicus | Italy / Western Mediterranean | 1987 | |
| Synanceia verrucosa | Israel | 2010 | |
| Synaptula reciprocans | Greece / Eastern Mediterranean | 1995 | |
| Synaptula reciprocans | Israel | 1971 | |
| Synchiropus sechellensis | Greece / Central Mediterranean | 2018 | |
| Synchiropus sechellensis | Greece / Eastern Mediterranean | 2014 | |
| Syngnathus acus | Turkey / Black Sea | 2000 - 2009 | |
| Syngnathus acus | Ukraine / Black Sea | 2006 | |
| Synidotea laevidorsalis | France / Biscay Gulf | To 1975 | |
| Synidotea laevidorsalis | France / Celtic seas | 1975 | |
| Synidotea laticauda | Belgium | To 2005 | |
| Synidotea laticauda | France / Biscay Gulf | To 1975 | |
| Synidotea laticauda | France / English Channel | 2017 | |
| Synidotea laticauda | Germany / North Sea | 2011 | |
| Synidotea laticauda | Netherlands | 2009 | |
| Synidotea laticauda | Spain / Iberian Coastal | To 1996 | |
| Synurella ambulans | Belgium | To 2016 | |
| Syphonota geographica | Greece / Central Mediterranean | 2002 | |
| Syphonota geographica | Greece / Eastern Mediterranean | 2014 | |
| Syphonota geographica | Italy / Central Mediterranean | 1999 | |
| Syracolithus dalmaticus | Ukraine / Black Sea | 1990 - 1999 | |
| Syrnola fasciata | Greece / Eastern Mediterranean | 2012 | |
| Syrnola fasciata | Israel | 1949 | |
| Syrnola lendix | Israel | 1994 | |
| Tachidiella minuta | Turkey / Black Sea | 2009 | |
| Taeniastrotus sp. | Ireland | To 1993 | |
| Takayama tasmanica | France / Biscay Gulf | To 2008 | |
| Talochlamys multistriata | Spain / Iberian Coastal | To 2017 | |
| Tasserkidrilus americanus | Belgium | To 2006 | |
| Tasserkidrilus americanus | Netherlands | To 2016 | |
| Taurulus bubalis | Iceland | 2005 | |
| Tayuva lilacina | Greece / Eastern Mediterranean | 2012 | |
| Tedania anhelans | Australia / Bass strait | 1886 | |
| Tellina compressa | Spain / Iberian Coastal | To 2002 | |
| Telmatogeton japonicus | Belgium | To 2005 | |
| Telmatogeton japonicus | Finland | 2008 | |
| Telmatogeton japonicus | France / English Channel | 2005 | |
| Telmatogeton japonicus | France / North Sea | 2005 | |
| Telmatogeton japonicus | Germany / Baltic Sea | 1962 | |
| Telmatogeton japonicus | Germany / North Sea | 1979 | |
| Telmatogeton japonicus | Ireland | To 1999 | |
| Telmatogeton japonicus | Netherlands | To 1993 | |
| Telmatogeton japonicus | Poland | 1970 | |
| Telmatogeton japonicus | Sweden / Baltic Sea | 2007 | |
| Telmatogeton japonicus | Sweden / North Sea | 1983 | |
| Telmatogeton japonicus | United Kingdom (Britain) / North Sea / Orkney Islands | 2015 | |
| Tenellia adspersa | Portugal / Iberian Coastal | 2016 | |
| Tenellia adspersa | Russia / Caspian Sea | 1989 | |
| Terapon jarbua | Israel | 2009 | |
| Terapon puta | Israel | 1984 | |
| Terapon puta | Italy / Adriatic Sea | 2021 | |
| Terapon theraps | Greece / Eastern Mediterranean | 2008 | |
| Terebella ehrenbergi | Israel | 1976 | |
| Terebella lapidaria | Ireland | 1993 | |
| Teredo bartschi | Israel | 1961 - 1964 | |
| Teredo bartschi | Italy / Adriatic Sea | 2007 | |
| Teredo bartschi | Italy / Central Mediterranean | 2009 | |
| Teredo bartschi | Portugal / Iberian Coastal | 2003 | |
| Teredo navalis | Belgium | To 1600 | |
| Teredo navalis | Bulgaria | To 0001 | |
| Teredo navalis | Denmark / Baltic Sea | To 1853 | |
| Teredo navalis | Denmark / North Sea | To 1853 | |
| Teredo navalis | Faroe Islands | To 1950 | |
| Teredo navalis | France / Biscay Gulf | To 1950 | |
| Teredo navalis | France / Celtic seas | | |
| Teredo navalis | France / English Channel | To 1886 | |
| Teredo navalis | France / North Sea | To 1730 | |
| Teredo navalis | France / Western Mediterranean | To 1886 | |
| Teredo navalis | Germany / Baltic Sea | 1800 - 1899 | |
| Teredo navalis | Germany / North Sea | 1791 | |
| Teredo navalis | Greece / Central Mediterranean | 1883 | |
| Teredo navalis | Greece / Eastern Mediterranean | 1940 | |
| Teredo navalis | Iceland | To 1950 | |
| Teredo navalis | Ireland | To 1845 | |
| Teredo navalis | Netherlands | To 1660 | |
| Teredo navalis | Norway / North Sea | 1701 - 1800 | |
| Teredo navalis | Norway / Norwegian Sea | To 2001 | |
| Teredo navalis | Portugal / Iberian Coastal | To 1979 | |
| Teredo navalis | Romania | To 0001 | |
| Teredo navalis | Russia / Azov Sea | 1953 | |
| Teredo navalis | Sweden / Baltic Sea | 1800 - 1899 | |
| Teredo navalis | Sweden / North Sea | 1800 - 1850 | |
| Teredo navalis | Turkey / Black Sea | 2007 | |
| Teredo navalis | Ukraine / Black Sea | To 0001 | |
| Teredo navalis | United Kingdom (Britain) / Celtic seas | 1100 - 1199 | |
| Teredo navalis | United Kingdom (Britain) / English Channel | | |
| Teredo navalis | United Kingdom (Britain) / North Sea | | |
| Teredora malleolus | United Kingdom (Britain) / North Sea / Orkney Islands | To 1956 | |
| Tessepora atlanticum | Portugal / Azores | To 1965 | |
| Tetrancistrum polymorphus | Israel | 1971 | |
| Tetrancistrum strophosolenum | Israel | 1971 | |
| Tetrancistrum suezicus | Israel | 1971 | |
| Tetraodon fluviatilis | Belgium | 2001 | |
| Tetrosomus gibbosus | Israel | 1987 | |
| Thalamita gloriensis | Italy / Western Mediterranean | 1977 | |
| Thalamita poissonii | Greece / Eastern Mediterranean | 1983 | |
| Thalamita poissonii | Israel | 1952 | |
| Thalassiosira hendeyi | Belgium | To 1978 | |
| Thalassiosira hendeyi | Germany / North Sea | To 1993 | |
| Thalassiosira hendeyi | Netherlands | To 1978 | |
| Thalassiosira nordenskioeldii | Bulgaria | 1986 | |
| Thalassiosira nordenskioeldii | Netherlands | To 1991 | |
| Thalassiosira nordenskioeldii | Romania | 1986 | |
| Thalassiosira nordenskioeldii | Ukraine / Black Sea | 1986 - 2000 | |
| Thalassiosira tealata | France / Biscay Gulf | 1950 | |
| Thalassiosira tealata | France / Celtic seas | | |
| Thalassiosira tealata | France / English Channel | 1950 | |
| Thalassiosira tealata | France / North Sea | 1950 | |
| Thalassiosira tealata | Germany / North Sea | 2001 - 2003 | |
| Thalassiosira tealata | Norway / North Sea | 1968 | |
| Thalassiosira tealata | United Kingdom (Britain) / Celtic seas | 1950 | |
| Thalassiosira tealata | United Kingdom (Britain) / English Channel | 1950 | |
| Tharyx killariensis | Denmark / Baltic Sea | 2012 | |
| Tharyx killariensis | Denmark / North Sea | 2012 | |
| Tharyx killariensis | Germany / North Sea | 1972 | |
| Thecadinium kofoidii | France / English Channel | To 2011 | |
| Thecadinium kofoidii | Germany / North Sea | 1997 | |
| Thecadinium yashimaense | Germany / North Sea | 2002 | |
| Thelepus japonicus | France / Biscay Gulf | 2017 | |
| Thelepus japonicus | France / English Channel | 2018 | |
| Theora lubrica | Australia / Bass strait | 1958 | |
| Theora lubrica | Germany / North Sea | 2021 | |
| Theora lubrica | Israel | 2006 | |
| Theora lubrica | Italy / Western Mediterranean | 2001 | |
| Theora lubrica | Netherlands | To 2003 | |
| Theora lubrica | Spain / Iberian Coastal | 2010 | |
| Thulinia microrchis | Israel | 1977 | |
| Tiaropsis multicirrata | Ukraine / Black Sea | From 1990 | |
| Timarete punctata | Greece / Eastern Mediterranean | 2006 | |
| Timoclea marica | Israel | 1997 | |
| Tintinnopsis directa | Russia / Black Sea | 2001 | |
| Tintinnopsis directa | Ukraine / Black Sea | 2001 | |
| Tintinnopsis nudicauda | Ukraine / Black Sea | 2000 - 2009 | |
| Tintinnopsis tocantinensis | Russia / Black Sea | 2010 | |
| Tiostrea chilensis | France / Celtic seas | 1982 | |
| Tiostrea chilensis | United Kingdom (Britain) / Celtic seas | 1963 | |
| Tonicia atrata | Portugal / Iberian Coastal | To 1985 | |
| Tonicia atrata | Spain / Iberian Coastal | 1978 | |
| Tonna pennata | Portugal / Madeira | To 1998 | |
| Torquigener flavimaculosus | Greece / Central Mediterranean | 2016 | |
| Torquigener flavimaculosus | Greece / Eastern Mediterranean | 2006 | |
| Torquigener flavimaculosus | Israel | 1987 | |
| Tortanus discaudatus | Denmark / Baltic Sea | 2023 | |
| Tortanus discaudatus | Denmark / North Sea | 2023 | |
| Toxonidea insignis | Ukraine / Black Sea | From 1902 | |
| Trachysalambria palaestinensis | Greece / Eastern Mediterranean | 1995 | |
| Trachysalambria palaestinensis | Israel | 1924 - 1925 | |
| Trachysalambria palaestinensis | Italy / Central Mediterranean | 2016 | |
| Transkeia bogii | Israel | 1982 | |
| Trapania toddi | Israel | 2014 | |
| Tremoctopus gracilis | Italy / Western Mediterranean | 2002 | |
| Tribolodon brandtii | Ukraine / Azov Sea | 1950 - 1959 | |
| Tricellaria inopinata | Belgium | 2000 | |
| Tricellaria inopinata | France / Biscay Gulf | 2000 | |
| Tricellaria inopinata | France / English Channel | 2003 | |
| Tricellaria inopinata | France / North Sea | 2003 | |
| Tricellaria inopinata | Germany / North Sea | To 2009 | |
| Tricellaria inopinata | Greece / Eastern Mediterranean | 2015 | |
| Tricellaria inopinata | Ireland | 2005 | |
| Tricellaria inopinata | Italy / Adriatic Sea | 1982 | |
| Tricellaria inopinata | Italy / Western Mediterranean | 2010 | |
| Tricellaria inopinata | Netherlands | 2000 | |
| Tricellaria inopinata | Norway / Norwegian Sea | From 2014 | |
| Tricellaria inopinata | Portugal / Azores | To 2014 | |
| Tricellaria inopinata | Portugal / Iberian Coastal | To 2004 | |
| Tricellaria inopinata | Portugal / Madeira | 2011 | |
| Tricellaria inopinata | Spain / Iberian Coastal | To 2011 | |
| Tricellaria inopinata | United Kingdom (Britain) / Celtic seas | 1998 | |
| Tricellaria inopinata | United Kingdom (Britain) / English Channel | 1998 | |
| Tricellaria inopinata | United Kingdom (Britain) / North Sea / Orkney Islands | From 2014 | |
| Tricellaria occidentalis | Australia / Bass strait | 1889 | |
| Triconia minuta | Bulgaria | 2000 | |
| Triconia minuta | Ukraine / Black Sea | From 1997 | |
| Tridentiger barbatus | Netherlands | 2016 | |
| Tridentiger trigonocephalus | Australia / Bass strait | 1977 | |
| Tridentiger trigonocephalus | Israel | 2006 | |
| Tridentiger trigonocephalus | Ukraine / Black Sea | 2006 | |
| Trieres mobiliensis | Denmark / Baltic Sea | 1983 | |
| Trieres mobiliensis | Denmark / North Sea | 1983 | |
| Trieres regia | Denmark / Baltic Sea | 1989 | |
| Trieres regia | Denmark / North Sea | 1989 | |
| Trinchesia genovae | France / Celtic seas | 2017 | |
| Trinectes maculatus | Netherlands | 1984 | |
| Tripos arietinus | Denmark / Baltic Sea | 1900 | |
| Tripos arietinus | Denmark / North Sea | 1992 | |
| Tripos candelabrus | France / Biscay Gulf | 2005 | |
| Tripos macroceros | Denmark / Baltic Sea | 1900 | |
| Tripos macroceros | Denmark / North Sea | 1901 | |
| Tritia corniculum | France / Biscay Gulf | 2009 | |
| Tritia corniculum | France / English Channel | 2013 | |
| Tritia corniculum | Spain / Iberian Coastal | 1996 | |
| Tritia neritea | France / Biscay Gulf | 1976 | |
| Tritia neritea | Spain / Iberian Coastal | 1991 | |
| Trivirostra triticum | Israel | 1970 | |
| Trochammina hadai | France / English Channel | 2019 | |
| Trochus erithreus | Israel | 1968 | |
| Truncatella subcylindrica | Portugal / Azores | To 1976 | |
| Truncatella subcylindrica | Portugal / Madeira | To 1897 | |
| Trypauchen vagina | Israel | 2009 | |
| Tubificoides benedii | Ukraine / Black Sea | From 1916 | |
| Tubificoides heterochaetus | Belgium | 1953 | |
| Tubificoides heterochaetus | Germany / Baltic Sea | To 2013 | |
| Tubificoides heterochaetus | Germany / North Sea | To 2013 | |
| Tubificoides heterochaetus | Netherlands | To 2016 | |
| Tubificoides heterochaetus | Poland | To 1979 | |
| Tubificoides pseudogaster | Finland | 1990 - 2005 | |
| Tubificoides pseudogaster | Netherlands | To 2016 | |
| Tubificoides pseudogaster | Russia / Baltic Sea / St. Petersburg area | 1995 | |
| Tubularia indivisa | Portugal / Azores | To 1989 | |
| Tuleariocaris neglecta | Spain / Canary Islands | To 2003 | |
| Turbonilla edgarii | Israel | 1980 | |
| Turbonilla flaianoi | Italy / Adriatic Sea | 1993 | |
| Turritopsis nutricula | Australia / Bass strait | 1982 | |
| Tylerius spinosissimus | Greece / Eastern Mediterranean | 2004 | |
| Tylerius spinosissimus | Israel | 2010 | |
| Tylosurus choram | Israel | 2001 | |
| Ulva australis | France / Biscay Gulf | 2005 - 2007 | |
| Ulva australis | France / English Channel | 1994 | |
| Ulva australis | France / Western Mediterranean | 1984 | |
| Ulva australis | Germany / North Sea | To 2014 | |
| Ulva australis | Italy / Adriatic Sea | 2010 | |
| Ulva australis | Netherlands | 1993 | |
| Ulva californica | Germany / North Sea | 2007 - 2008 | |
| Ulva californica | Ireland | 2006 | |
| Ulva californica | Italy / Adriatic Sea | 2011 | |
| Ulva chaugulii | Israel | 2015 | |
| Ulva compressa | Australia / Bass strait | 1977 | |
| Ulva gigantea | Germany / North Sea | 2015 | |
| Ulva intestinalis | Australia / Bass strait | 1981 | |
| Ulva lactuca | Australia / Bass strait | 1978 | |
| Ulva lactuca | France / Biscay Gulf | 1993 | |
| Ulva lactuca | France / Western Mediterranean | 1993 | |
| Ulva lactuca | Portugal / Azores | 2005 - 2007 | |
| Ulva lactuca | Romania | 1948 | |
| Ulva lactuca | Turkey / Black Sea | 1988 | |
| Ulva ohnoi | France / English Channel | 2015 | |
| Ulva ohnoi | Israel | 2002 | |
| Ulva ohnoi | Italy / Central Mediterranean | 2011 - 2013 | |
| Ulva pertusa | France / Western Mediterranean | 1984 | |
| Ulva pertusa | Netherlands | 1993 | |
| Ulva pertusa | Portugal / Iberian Coastal | From 2007 | |
| Ulva pertusa | Spain / Iberian Coastal | To 2009 | |
| Ulva rigida | Australia / Bass strait | 1983 | |
| Ulva rigida | Iceland | 1972 | |
| Ulva stenophylla | Australia / Bass strait | 1988 | |
| Ulva tepida | Israel | 2002 | |
| Ulvaria obscura | France / Western Mediterranean | 1985 | |
| Ulvaria obscura | Italy / Adriatic Sea | 2000 | |
| Ulvaria splendens | Netherlands | 2018 | |
| Umbraulva dangeardii | Germany / North Sea | 2014 | |
| Umbraulva olivascens | United Kingdom (Britain) / English Channel | 1960 | |
| Undaria pinnatifida | Australia / Bass strait | 1996 | |
| Undaria pinnatifida | Belgium | 1999 | |
| Undaria pinnatifida | France / Biscay Gulf | 1983 | |
| Undaria pinnatifida | France / Celtic seas | 1983 | |
| Undaria pinnatifida | France / English Channel | 1983 | |
| Undaria pinnatifida | France / North Sea | 1986 | |
| Undaria pinnatifida | France / Western Mediterranean | 1971 | |
| Undaria pinnatifida | Germany / North Sea | 2016 | |
| Undaria pinnatifida | Ireland | 2012 | |
| Undaria pinnatifida | Italy / Adriatic Sea | 1992 | |
| Undaria pinnatifida | Italy / Central Mediterranean | 1998 | |
| Undaria pinnatifida | Netherlands | 1999 | |
| Undaria pinnatifida | New Zealand / New Zealand Shelf / North Island | To 1987 | |
| Undaria pinnatifida | New Zealand / New Zealand Shelf / South Island | To 1990 | |
| Undaria pinnatifida | Portugal / Iberian Coastal | To 2007 | |
| Undaria pinnatifida | Spain / Iberian Coastal | 1988 | |
| Undaria pinnatifida | United Kingdom (Britain) / Celtic seas / Channel Islands | 1990 - 1999 | |
| Undaria pinnatifida | United Kingdom (Britain) / English Channel | 1994 | |
| Undaria pinnatifida | United Kingdom (Britain) / North Sea | 2009 | |
| Undatella quadrata | Ukraine / Black Sea | From 1985 | |
| Upeneus moluccensis | Greece / Central Mediterranean | 1976 | |
| Upeneus moluccensis | Greece / Eastern Mediterranean | 1947 | |
| Upeneus moluccensis | Israel | 1946 | |
| Upeneus pori | Greece / Central Mediterranean | 2014 | |
| Upeneus pori | Greece / Eastern Mediterranean | 2003 | |
| Upeneus pori | Israel | 1953 | |
| Upeneus pori | Italy / Central Mediterranean | 2012 | |
| Urnatella gracilis | Romania | 1950 | |
| Urnatella gracilis | Russia / Black Sea | 1950 | |
| Urnatella gracilis | Ukraine / Black Sea | From 1954 | |
| Urocaridella pulchella | Israel | 2016 | |
| Uronema marinum | Italy / Adriatic Sea | From 2008 | |
| Urosalpinx cinerea | France / Biscay Gulf | 1960 | |
| Urosalpinx cinerea | France / Celtic seas | 1969 | |
| Urosalpinx cinerea | France / English Channel | 1970 | |
| Urosalpinx cinerea | France / North Sea | 1960 | |
| Urosalpinx cinerea | Netherlands | 2007 | |
| Urosalpinx cinerea | United Kingdom (Britain) / North Sea | To 1928 | |
| Vallicula multiformis | Portugal / Madeira | To 1998 | |
| Vanderhorstia mertensi | Greece / Eastern Mediterranean | 2019 | |
| Vanderhorstia mertensi | Israel | 2012 | |
| Varicopeza pauxilla | Israel | 2016 | |
| Varicorbula erythraeensis | Israel | 2009 | |
| Varicorbula gibba | Australia / Bass strait | 1987 | |
| Vaucheria dichotoma f. marina | Bulgaria | 2012 | |
| Vaucheria dichotoma f. marina | Romania | 1957 | |
| Vertebrata fucoides | Bulgaria | 1936 | |
| Vertebrata fucoides | France / Western Mediterranean | 1988 | |
| Vertebrata fucoides | Greece / Central Mediterranean | 2001 | |
| Vertebrata fucoides | Portugal / Azores | 1960 | |
| Vertebrata fucoides | Turkey / Black Sea | 1973 | |
| Vexillum depexum | Israel | 1964 | |
| Victorella pavida | Finland | 1930 - 1959 | |
| Victorella pavida | France / Biscay Gulf | 1960 | |
| Victorella pavida | France / Celtic seas | 1969 | |
| Victorella pavida | Germany / Baltic Sea | 1880 | |
| Victorella pavida | Germany / North Sea | To 2016 | |
| Victorella pavida | Netherlands | To 1969 | |
| Victorella pavida | Sweden / Baltic Sea | 1948 | |
| Victorella pavida | United Kingdom (Britain) / English Channel | 1870 | |
| Victorella pavida | United Kingdom (Britain) / North Sea | 1870 | |
| Virididentula dentata | Portugal / Azores | To 1997 | |
| Virididentula dentata | Portugal / Madeira | 1909 | |
| Viriola bayani | Israel | 2018 | |
| Viviparus acerosus | Netherlands | 2007 | |
| Viviparus viviparus | Germany / North Sea | 1912 | |
| Viviparus viviparus | Ireland | 1995 - 2000 | |
| Voorwindia tiberiana | Israel | 1997 | |
| Warnowia schuettii | Ukraine / Black Sea | 2001 | |
| Watersipora arcuata | Australia / Bass strait | 1973 - 1976 | |
| Watersipora arcuata | France / Western Mediterranean | From 2015 | |
| Watersipora arcuata | Italy / Central Mediterranean | 2016 | |
| Watersipora arcuata | Italy / Western Mediterranean | 2013 - 2014 | |
| Watersipora aterrima | France / Biscay Gulf | 1983 | |
| Watersipora aterrima | France / Celtic seas | 1983 | |
| Watersipora souleorum | Italy / Western Mediterranean | To 1909 | |
| Watersipora subatra | France / Biscay Gulf | 1968 | |
| Watersipora subatra | France / English Channel | 1983 | |
| Watersipora subatra | France / North Sea | 1983 | |
| Watersipora subatra | Ireland | 2011 | |
| Watersipora subatra | Spain / Spain | 2017 | |
| Watersipora subtorquata | Australia / Bass strait | 1973 - 1976 | |
| Watersipora subtorquata | France / Biscay Gulf | 1983 | |
| Watersipora subtorquata | Germany / North Sea | 2012 | |
| Watersipora subtorquata | Ireland | 2011 | |
| Watersipora subtorquata | Italy / Western Mediterranean | 1960 | |
| Watersipora subtorquata | Portugal / Azores | To 1888 | |
| Watersipora subtorquata | Portugal / Iberian Coastal | To 2004 | |
| Watersipora subtorquata | Portugal / Madeira | 2006 | |
| Watersipora subtorquata | Spain / Iberian Coastal | To 2016 | |
| Watersipora subtorquata | United Kingdom (Britain) / English Channel | 2007 | |
| Weinkauffia macandrewii | Greece / Eastern Mediterranean | 2009 | |
| Wildemania miniata | Denmark / Baltic Sea | 1995 | |
| Wildemania miniata | Denmark / North Sea | 1995 | |
| Womersleyella setacea | France / Western Mediterranean | 1987 | |
| Womersleyella setacea | Greece / Central Mediterranean | 2001 | |
| Womersleyella setacea | Greece / Eastern Mediterranean | 1988 | |
| Womersleyella setacea | Israel | 2015 | |
| Womersleyella setacea | Italy / Adriatic Sea | 1997 | |
| Womersleyella setacea | Italy / Central Mediterranean | 1993 | |
| Womersleyella setacea | Italy / Western Mediterranean | 1986 | |
| Womersleyella setacea | Spain / Iberian Coastal | To 2011 | |
| Xanthias lamarckii | Greece / Eastern Mediterranean | 2013 | |
| Xenostrobus securis | France / Western Mediterranean | 2006 | |
| Xenostrobus securis | Italy / Adriatic Sea | 1991 | |
| Xenostrobus securis | Italy / Western Mediterranean | 2006 | |
| Xenostrobus securis | Spain / Iberian Coastal | 2006 | |
| Xylophaga dorsalis | Greece / Eastern Mediterranean | 1800 - 1883 | |
| Xylophaga praestans | Greece / Eastern Mediterranean | 1987 | |
| Yoldia limatula | Belgium | To 2020 | |
| Yoldia limatula | France / English Channel | To 2021 | |
| Yoldia limatula | Netherlands | 2019 | |
| Zafra savignyi | Israel | 1952 | |
| Zafra selasphora | Israel | 1976 | |
| Zebrasoma xanthurum | Italy / Western Mediterranean | 2015 | |
| Zeuxo holdichi | France / Biscay Gulf | 1987 | |
| Zeuxo holdichi | France / English Channel | 1996 | |
| Zeuxo holdichi | Italy / Adriatic Sea | 2019 | |
| Zeuxo holdichi | Netherlands | 2012 | |
| Zopfiella latipes | Ukraine / Black Sea | From 2001 | |
| Zygoceros rhombus | Denmark / Baltic Sea | 1983 | |
| Zygoceros rhombus | Denmark / North Sea | 1983 | |
