| Species |
Recipient region |
Date of the first record |
|
| 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 | |
| Gracilaria vermiculophylla | Belgium | To 2011 | |
| Gracilaria vermiculophylla | Canada / Gulf of Alaska | 2006 | |
| Gracilaria vermiculophylla | Denmark / Baltic Sea | 2003 | |
| Gracilaria vermiculophylla | Denmark / North Sea | 2005 | |
| Gracilaria vermiculophylla | France / Biscay Gulf | 2005 | |
| Gracilaria vermiculophylla | France / Celtic seas | 1996 | |
| Gracilaria vermiculophylla | France / English Channel | 1993 | |
| Gracilaria vermiculophylla | Germany / Baltic Sea | 2005 | |
| Gracilaria vermiculophylla | Germany / North Sea | 2002 | |
| Gracilaria vermiculophylla | Ireland | 2012 | |
| Gracilaria vermiculophylla | Italy / Adriatic Sea | 2008 | |
| Gracilaria vermiculophylla | Mexico / California Current | 1979 | |
| Gracilaria vermiculophylla | Netherlands | 1994 | |
| Gracilaria vermiculophylla | Norway / North Sea | 2012 | |
| Gracilaria vermiculophylla | Portugal / Iberian Coastal | From 1989 | |
| Gracilaria vermiculophylla | Spain / Iberian Coastal | To 2003 | |
| Gracilaria vermiculophylla | Sweden / North Sea | 2003 | |
| Gracilaria vermiculophylla | United Kingdom (Britain) / Celtic seas | 2008 - 2013 | |
| Gracilaria vermiculophylla | United Kingdom (Britain) / English Channel | 2015 | |
| Gracilaria vermiculophylla | USA / California Current | 1994 | |
| Gracilaria vermiculophylla | USA / Gulf of Alaska | 2017 | |
| Gracilaria vermiculophylla | USA / Hudson river | 2000 | |
| Gracilaria vermiculophylla | USA / Mid-Atlantic Bight | To 1998 | |
| 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 | |
