| Species |
Recipient region |
Date of the first record |
|
| Labyrinthula zosterae | Germany / North Sea | 1935 |  |
| Labyrinthula zosterae | Ireland | 1926 - 1934 |  |
| Laeospira berkeleyana | France / Western Mediterranean | 1977 |  |
| Laeospira berkeleyana | Portugal / Madeira | To 1980 |  |
| Laevichlamys superficialis | Israel | 2020 |  |
| Lagocephalus guentheri | Greece / Central Mediterranean | 2005 |  |
| Lagocephalus guentheri | Greece / Eastern Mediterranean | 1952 |  |
| Lagocephalus guentheri | Israel | 1951 |  |
| Lagocephalus sceleratus | Greece / Adriatic Sea | 2018 |  |
| Lagocephalus sceleratus | Greece / Central Mediterranean | 2009 |  |
| Lagocephalus sceleratus | Greece / Eastern Mediterranean | 2005 |  |
| Lagocephalus sceleratus | Israel | 2004 |  |
| Lagocephalus sceleratus | Italy / Adriatic Sea | 2014 |  |
| Lagocephalus sceleratus | Italy / Central Mediterranean | 2013 - 2014 |  |
| Lagocephalus sceleratus | Italy / Western Mediterranean | 2014 |  |
| Lagocephalus sceleratus | Spain / Iberian Coastal | 2014 |  |
| Lagocephalus suezensis | Greece / Eastern Mediterranean | 2003 |  |
| Lagocephalus suezensis | Israel | 1987 |  |
| Laminaria ochroleuca | Ireland | 2018 |  |
| Lamprohaminoea ovalis | France / Western Mediterranean | 2021 |  |
| Lamprohaminoea ovalis | Greece / Central Mediterranean | 2001 |  |
| Lamprohaminoea ovalis | Greece / Eastern Mediterranean | 2005 |  |
| Lamprohaminoea ovalis | Italy / Central Mediterranean | 2007 |  |
| Lamprohaminoea ovalis | Italy / Western Mediterranean | 2008 |  |
| Laonome calida | Belgium | To 2014 |  |
| Laonome calida | Netherlands | 2009 |  |
| Laonome sp. | Estonia | 2012 |  |
| Laonome sp. | Latvia | 2014 |  |
| Laonome sp. | Poland | 2015 |  |
| Laonome sp. | Sweden / Baltic Sea | 2014 |  |
| Laonome triangularis | Italy / Western Mediterranean | 2023 |  |
| Laonome xeprovala sp. nov. | Finland | 2016 |  |
| Laonome xeprovala sp. nov. | Germany / Baltic Sea | 2016 |  |
| Laonome xeprovala sp. nov. | Germany / North Sea | 2016 |  |
| Lateolabrax japonicus | Ukraine / Azov Sea | 1960 - 1979 |  |
| Lateolabrax japonicus | Ukraine / Black Sea | 1960 - 1979 |  |
| Laternula anatina | Israel | 1958 |  |
| Laticorophium baconi | France / Western Mediterranean | 2020 |  |
| Latopilumnus malardi | France / English Channel | 1910 |  |
| Laurencia brongniartii | France / Celtic seas | 1989 |  |
| Laurencia brongniartii | France / English Channel | 1989 |  |
| Laurencia brongniartii | Portugal / Azores | 2005 - 2007 |  |
| Laurencia caduciramulosa | France / Western Mediterranean | 2002 |  |
| Laurencia caduciramulosa | Greece / Central Mediterranean | 2001 |  |
| Laurencia caduciramulosa | Greece / Eastern Mediterranean | 2009 |  |
| Laurencia caduciramulosa | Israel | 2013 |  |
| Laurencia caduciramulosa | Italy / Central Mediterranean | 1991 |  |
| Laurencia chondrioides | Greece / Central Mediterranean | 1998 |  |
| Laurencia chondrioides | Greece / Eastern Mediterranean | 2006 |  |
| Laurencia chondrioides | Portugal / Azores | 2005 - 2007 |  |
| Laurencia dendroidea | Portugal / Azores | 2005 - 2007 |  |
| Laurencia majuscula | Portugal / Azores | 2005 - 2007 |  |
| Laurencia majuscula | Portugal / Madeira | To 2001 |  |
| Laurencia minuta | Israel | 2015 |  |
| Laurencia okamurae | France / Western Mediterranean | 1984 |  |
| Leathesia marina | Australia / Bass strait | 1971 |  |
| Leathesia marina | France / Western Mediterranean | 1905 |  |
| Leathesia marina | Italy / Adriatic Sea | 1996 |  |
| Leathesia marina | Portugal / Azores | 1897 |  |
| Lecithochirium magnicaudatum | Israel | 1977 |  |
| Leiocapitellides analis | Greece / Eastern Mediterranean | 2000 |  |
| Leiochrides australis | Italy / Western Mediterranean | 1990 |  |
| Lennoxia faveolata | Germany / Baltic Sea | 2009 |  |
| Lennoxia faveolata | Germany / North Sea | 2009 |  |
| Lennoxia faveolata | Sweden / Baltic Sea | 2007 |  |
| Leonnates decipiens | Israel | 1989 |  |
| Leonnates indicus | Israel | 1991 |  |
| Leonnates persicus | Greece / Eastern Mediterranean | 2013 |  |
| Leonnates persicus | Israel | 1937 |  |
| Lepidodinium chlorophorum | Denmark / Baltic Sea | 1999 |  |
| Lepidodinium chlorophorum | Denmark / North Sea | 1999 |  |
| Lepidonotus tenuisetosus | Greece / Eastern Mediterranean | 2008 |  |
| Lepidonotus tenuisetosus | Israel | 1969 |  |
| Lepidonotus tenuisetosus | Italy / Adriatic Sea | 2023 |  |
| Lepomis gibbosus | Norway / North Sea | To 2004 |  |
| Lepomis gibbosus | Poland | 1927 |  |
| Lepomis gibbosus | Ukraine / Black Sea | 1949 - 2002 |  |
| Leptochela pugnax | Israel | 1947 |  |
| Leptomesochra tenuicornis | Russia / Black Sea | 1999 |  |
| Leptosiphonia brodiei | Australia / Bass strait | 1959 |  |
| Lernanthropus callionymicola | Israel | 2008 |  |
| Lessardia elongata | Bulgaria | 2008 |  |
| Lessardia elongata | Romania | 2004 |  |
| Leucosolenia eleanor | USA / California Current | 2012 |  |
| Leucosolenia somesii | Netherlands | To 1996 |  |
| Leucotina natalensis | Israel | 1978 |  |
| Liagora viscida | Turkey / Black Sea | 2000 - 2009 |  |
| Licornia jolloisii | Israel | 1975 |  |
| Ligia italica | Portugal / Azores | To 1887 |  |
| Ligia oceanica | Portugal / Azores | To 1998 |  |
| Ligophorus kaohsianghsieni | Ukraine / Black Sea | 1994 |  |
| Ligophorus llewellyni | Ukraine / Black Sea | 2007 |  |
| Ligophorus pilengas | Ukraine / Black Sea | 1996 |  |
| Limnodrilus cervix | Belgium | To 2009 |  |
| Limnodrilus cervix | Poland | 2010 |  |
| Limnomysis benedeni | Belgium | To 2005 |  |
| Limnomysis benedeni | Germany / Baltic Sea | 2010 |  |
| Limnomysis benedeni | Latvia | 1966 |  |
| Limnomysis benedeni | Lithuania | 1962 |  |
| Limnomysis benedeni | Russia / Baltic Sea / Kaliningrad area | 1962 |  |
| Limnoria lignorum | France / English Channel | To 1868 |  |
| Limnoria lignorum | Netherlands | 1885 - 1886 |  |
| Limnoria quadripunctata | France / Biscay Gulf | 1968 |  |
| Limnoria quadripunctata | France / English Channel | 1998 |  |
| Limnoria quadripunctata | France / Western Mediterranean | 2014 |  |
| Limnoria quadripunctata | Ireland | 1959 |  |
| Limnoria quadripunctata | Netherlands | To 1949 |  |
| Limnoria quadripunctata | Portugal / Iberian Coastal | To 1995 |  |
| Limnoria quadripunctata | United Kingdom (Britain) / Celtic seas | 1930 - 1939 |  |
| Limnoria quadripunctata | United Kingdom (Britain) / English Channel | 1930 - 1939 |  |
| Limnoria tripunctata | France / Biscay Gulf | 1968 |  |
| Limnoria tripunctata | Portugal / Iberian Coastal | 1960 - 1979 |  |
| Limnoria tripunctata | United Kingdom (Britain) / Celtic seas | 1950 - 1959 |  |
| Limnoria tripunctata | United Kingdom (Britain) / English Channel | 1950 - 1959 |  |
| Limulus polyphemus | Denmark / Baltic Sea | 1968 |  |
| Limulus polyphemus | Denmark / North Sea | 1968 |  |
| Limulus polyphemus | Germany / North Sea | 1866 |  |
| Limulus polyphemus | Netherlands | 1873 |  |
| Limulus polyphemus | Sweden / North Sea | |  |
| Linguimaera caesaris | Israel | 1952 |  |
| Linguimaera caesaris | Italy / Central Mediterranean | 2019 |  |
| Linopherus canariensis | Greece / Eastern Mediterranean | 2007 |  |
| Linopherus canariensis | Israel | 1972 |  |
| Linopherus canariensis | Italy / Central Mediterranean | 2008 |  |
| Linopherus canariensis | Italy / Western Mediterranean | 2008 |  |
| Lioberus ligneus | Israel | 2020 |  |
| Lioloma pacificum | Bulgaria | 2008 |  |
| Lioloma pacificum | Georgia | 2007 |  |
| Lioloma pacificum | Romania | 2001 |  |
| Lioloma pacificum | Russia / Black Sea | 2005 |  |
| Lioloma pacificum | Ukraine / Black Sea | From 1999 |  |
| Lissodendoryx isodictyalis | Australia / Bass strait | 1882 |  |
| Lithoglyphus naticoides | Belgium | To 1924 |  |
| Lithoglyphus naticoides | Germany / Baltic Sea | To 1883 |  |
| Lithoglyphus naticoides | Poland | 1873 |  |
| Lithoglyphus naticoides | Russia / Baltic Sea / Kaliningrad area | 1801 - 1899 |  |
| Lithognathus mormyrus | Portugal / Madeira | 1967 |  |
| Lithognathus mormyrus | Romania | From 1980 |  |
| Lithognathus mormyrus | Ukraine / Black Sea | 2013 |  |
| Lithophyllum orbiculatum | Turkey / Black Sea | 2000 - 2009 |  |
| Lithophyllum yessoense | France / Western Mediterranean | 1993 |  |
| Litopenaeus stylirostris | China / Yellow Sea | To 2002 |  |
| Litopenaeus vannamei | China / Yellow Sea | To 2005 |  |
| Litosiphon laminariae | United Kingdom (Britain) / English Channel | 1900 |  |
| Littorina saxatilis | Italy / Adriatic Sea | To 1792 |  |
| Livoneca redmanii | Spain / Iberian Coastal | To 2016 |  |
| Liza aurata | Russia / Caspian Sea | 1930 - 1934 |  |
| Liza carinata | Israel | 1970 |  |
| Liza saliens | Russia / Caspian Sea | 1930 - 1935 |  |
| Lobophora lessepsiana | Israel | 1960 |  |
| Lobophora schneideri | Israel | 2016 |  |
| Loimia medusa | France / Biscay Gulf | 2003 |  |
| Loimia medusa | France / English Channel | 2000 |  |
| Lomentaria flaccida | France / Western Mediterranean | 2002 |  |
| Lomentaria hakodatensis | France / Biscay Gulf | 2005 |  |
| Lomentaria hakodatensis | France / Celtic seas | 1984 |  |
| Lomentaria hakodatensis | France / English Channel | 1984 |  |
| Lomentaria hakodatensis | France / Western Mediterranean | 1979 |  |
| Lomentaria hakodatensis | Italy / Adriatic Sea | 2000 |  |
| Lomentaria hakodatensis | Netherlands | 2004 |  |
| Lomentaria hakodatensis | Portugal / Iberian Coastal | From 2008 |  |
| Lomentaria hakodatensis | Spain / Iberian Coastal | 1992 |  |
| Lophocladia lallemandii | France / Western Mediterranean | 2021 |  |
| Lophocladia lallemandii | Greece / Central Mediterranean | 1975 |  |
| Lophocladia lallemandii | Greece / Eastern Mediterranean | 1908 |  |
| Lophocladia lallemandii | Israel | 1953 |  |
| Lophocladia lallemandii | Italy / Adriatic Sea | To 1978 |  |
| Lophocladia lallemandii | Italy / Central Mediterranean | 1969 |  |
| Lophocladia lallemandii | Italy / Western Mediterranean | 1971 |  |
| Lovenella assimilis | Belgium | To 2012 |  |
| Lovenella assimilis | France / English Channel | To 2007 |  |
| Loxomitra kefersteinii | United Kingdom (Britain) / Celtic seas | 1950 |  |
| Loxosomella antedonis | United Kingdom (Britain) / Celtic seas | 1950 - 1959 |  |
| Ludwigia grandiflora (Michx.) | Germany / North Sea | 2009 |  |
| Lulwoana uniseptata | Ukraine / Black Sea | From 2001 |  |
| Lumbrinerides acutiformis | Italy / Central Mediterranean | 1995 |  |
| Lumbrinerides neogesae | Greece / Central Mediterranean | 2002 |  |
| Lumbrinerides neogesae | Italy / Adriatic Sea | 1991 |  |
| Lumbrinerides neogesae | Italy / Western Mediterranean | 1991 |  |
| Lumbrineris crassicephala | Portugal / Iberian Coastal | To 2017 |  |
| Lumbrineris perkinsi | Italy / Adriatic Sea | 2019 |  |
| Lumbrineris perkinsi | Italy / Central Mediterranean | To 1985 |  |
| Lumbrineris perkinsi | Italy / Western Mediterranean | 1975 - 1976 |  |
| Lumbrineris zatsepini | Canada / Hudson Bay Complex | To 2012 |  |
| Lutjanus argentimaculatus | Greece / Eastern Mediterranean | 2019 |  |
| Lutjanus argentimaculatus | Israel | 2018 |  |
| Lutjanus sebae | Greece / Eastern Mediterranean | 2010 |  |
| Lutjanus sebae | Italy / Western Mediterranean | 2016 |  |
| Lychaete herpestica | Israel | 1955 |  |
| Lymnaea sp. | United Kingdom (Britain) / Celtic seas / Channel Islands | |  |
| Lyrodus pedicellatus | France / Biscay Gulf | 2009 |  |
| Lyrodus pedicellatus | France / Western Mediterranean | 2014 |  |
| Lyrodus pedicellatus | Greece / Eastern Mediterranean | 1940 |  |
| Lyrodus pedicellatus | Portugal / Azores | To 1940 |  |
| Lyrodus pedicellatus | Portugal / Iberian Coastal | To 2002 |  |
| Lyrodus pedicellatus | Portugal / Madeira | To 1940 |  |
| Lyrodus pedicellatus | United Kingdom (Britain) / English Channel | 1938 |  |
| Lysidice collaris | France / Western Mediterranean | 2022 |  |
| Lysidice collaris | Greece / Central Mediterranean | 2000 |  |
| Lysidice collaris | Greece / Eastern Mediterranean | 1975 |  |
| Lysidice collaris | Israel | 1970 |  |
| Lysidice collaris | Italy / Central Mediterranean | 1961 |  |
| Lysidice collaris | Italy / Western Mediterranean | To 2007 |  |