Public domain: Introduction events' accounts (50 / 5516)
| Species |
Recipient region |
Date of the first record |
|
| 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 | |
