| Species |
Recipient region |
Date of the first record |
|
| 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 | |
