| Species |
Recipient region |
Date of the first record |
|
| 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 | |
| Margalefidinium polykrikoides | Bulgaria | 2008 | |
| Margalefidinium polykrikoides | Russia / Black Sea | 2000 | |
| Margalefidinium polykrikoides | Ukraine / Black Sea | From 2001 | |
| 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 | |
| Melanochlamys diomedea | Iceland | 2020 | |
| 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 / 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 | To 1999 | |
| 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 | France / Biscay Gulf | 2023 | |
| 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 | Iceland | 2014 | |
| 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 | |
