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