| Species |
Recipient region |
Date of the first record |
|
| Pachycordyle michaeli | Denmark / Baltic Sea | 1958 |  |
| Pachycordyle michaeli | Denmark / North Sea | 1958 | |
| Pachycordyle michaeli | Germany / Baltic Sea | 1960 | |
| Pachycordyle michaeli | Netherlands | 1964 | |
| Pachycordyle michaeli | Ukraine / Black Sea | From 2002 | |
| Pachycordyle michaeli | United Kingdom (Britain) / English Channel | 1973 | |
| Pachyegis brunnea | Iceland | 1990 | |
| Pachygrapsus marmoratus | France / English Channel | To 2008 | |
| Pachygrapsus transversus | France / Western Mediterranean | 1876 | |
| Pachymeniopsis gargiuloi | Italy / Central Mediterranean | To 1982 | |
| Pachymeniopsis gargiuloi | Spain / Iberian Coastal | To 2017 | |
| Pachymeniopsis lanceolata | France / Biscay Gulf | 2016 | |
| Pachymeniopsis lanceolata | Portugal / Madeira | 2006 | |
| Pacifastacus leniusculus | Belgium | 1979 | |
| Pacifastacus leniusculus | Estonia | 2014 | |
| Pacifastacus leniusculus | France / Biscay Gulf | 1970 - 1979 | |
| Pacifastacus leniusculus | France / English Channel | 1970 - 1979 | |
| Pacifastacus leniusculus | Germany / Baltic Sea | 1960 | |
| Pacifastacus leniusculus | Latvia | 1983 | |
| Pacifastacus leniusculus | Lithuania | 1972 | |
| Pacifastacus leniusculus | Netherlands | 2005 | |
| Pacifastacus leniusculus | Portugal / Iberian Coastal | To 2001 | |
| Pacifastacus leniusculus | Spain / Spain | 1974 | |
| Pacifastacus leniusculus | Sweden / Baltic Sea | 1959 - 1960 | |
| Pacificincola perforata | France / Biscay Gulf | 2001 | |
| Pacificincola perforata | France / English Channel | 2005 | |
| Pacificincola perforata | France / North Sea | 2005 | |
| Pacificincola perforata | Netherlands | 2005 | |
| Padina boergesenii | Israel | 1962 | |
| Padina boryana | Greece / Eastern Mediterranean | 1981 | |
| Pagurus longicarpus | Germany / North Sea | 2020 | |
| Palaemon adspersus | Canada / Northern Gulf of St. Lawrence | 2011 | |
| Palaemon adspersus | Canada / Southern Gulf of St. Lawrence and Eastern Scotian Shelf | 2011 | |
| Palaemon adspersus | Russia / Caspian Sea | 1936 | |
| Palaemon elegans | Denmark / Baltic Sea | 1992 | |
| Palaemon elegans | Denmark / North Sea | 2003 | |
| Palaemon elegans | Estonia | 2011 | |
| Palaemon elegans | Finland | 2003 | |
| Palaemon elegans | Germany / Baltic Sea | To 1989 | |
| Palaemon elegans | Germany / North Sea | To 2020 | |
| Palaemon elegans | Latvia | 2009 | |
| Palaemon elegans | Lithuania | 2000 - 2002 | |
| Palaemon elegans | Netherlands | To 2020 | |
| Palaemon elegans | Poland | 2002 | |
| Palaemon elegans | Russia / Baltic Sea / Kaliningrad area | 2000 - 2002 | |
| Palaemon elegans | Russia / Caspian Sea | 1939 | |
| Palaemon longirostris | Germany / Baltic Sea | To 1999 | |
| Palaemon longirostris | Poland | 2018 | |
| Palaemon macrodactylus | Belgium | 1998 | |
| Palaemon macrodactylus | Bulgaria | 2009 | |
| Palaemon macrodactylus | France / Biscay Gulf | 1998 | |
| Palaemon macrodactylus | France / Celtic seas | 2006 | |
| Palaemon macrodactylus | France / English Channel | 2009 | |
| Palaemon macrodactylus | France / North Sea | 2005 | |
| Palaemon macrodactylus | Germany / Baltic Sea | 2009 | |
| Palaemon macrodactylus | Germany / North Sea | 2004 | |
| Palaemon macrodactylus | Italy / Adriatic Sea | 2012 - 2013 | |
| Palaemon macrodactylus | Netherlands | 1999 | |
| Palaemon macrodactylus | Poland | 2014 | |
| Palaemon macrodactylus | Portugal / Iberian Coastal | To 2008 | |
| Palaemon macrodactylus | Romania | 2008 | |
| Palaemon macrodactylus | Spain / Iberian Coastal | To 1999 | |
| Palaemon macrodactylus | United Kingdom (Britain) / North Sea | 1992 | |
| Palaemonella rotumana | Israel | 1948 | |
| Palisada intermedia | Turkey / Black Sea | 1986 | |
| Palisada maris-rubri | Greece / Eastern Mediterranean | 2006 | |
| Palisada maris-rubri | Italy / Central Mediterranean | 1991 | |
| Palisada perforata | Turkey / Black Sea | 1973 | |
| Palmadusta lentiginosa | Israel | 1990 | |
| Palola valida | France / Western Mediterranean | 2022 | |
| Palola valida | Italy / Central Mediterranean | 2018 | |
| Pandalus latirostris | Turkey / Black Sea | 1959 | |
| Pandalus latirostris | Ukraine / Black Sea | From 1959 | |
| Panulirus guttatus | Portugal / Iberian Coastal | To 2009 | |
| Panulirus longipes longipes | Israel | 2018 | |
| Panulirus ornatus | Israel | 1988 | |
| Papenfussiella kuromo | Portugal / Azores | 1990 | |
| Papilloculiceps longiceps | Israel | 1986 | |
| Parablennius incognitus | Georgia | 2001 | |
| Parablennius incognitus | Turkey / Black Sea | 2000 - 2009 | |
| Parablennius incognitus | Ukraine / Black Sea | 2002 | |
| Paracanthurus hepatus | France / Western Mediterranean | 2021 | |
| Paracanthurus hepatus | Israel | 2015 | |
| Paracaprella pusilla | Israel | 2010 | |
| Paracaprella pusilla | Spain / Iberian Coastal | 2010 | |
| Paracartia grani | France / Biscay Gulf | 1974 | |
| Paracartia grani | France / English Channel | 1981 | |
| Paracartia grani | France / North Sea | 1981 | |
| Paracartia grani | France / Western Mediterranean | 1997 | |
| Paracartia grani | Greece / Eastern Mediterranean | 1988 | |
| Paracerceis sculpta | Australia / Bass strait | 1995 | |
| Paracerceis sculpta | France / Western Mediterranean | 2014 | |
| Paracerceis sculpta | Greece / Eastern Mediterranean | 2009 | |
| Paracerceis sculpta | Italy / Adriatic Sea | 1981 | |
| Paracerceis sculpta | Italy / Central Mediterranean | 1981 | |
| Paracerceis sculpta | Italy / Western Mediterranean | 1983 | |
| Paracerceis sculpta | Portugal / Azores | 2014 | |
| Paracerceis sculpta | Portugal / Madeira | From 2015 | |
| Paradella dianae | Greece / Eastern Mediterranean | 1997 | |
| Paradella dianae | Italy / Central Mediterranean | 2016 | |
| Paradella dianae | Italy / Western Mediterranean | 1985 | |
| Paradoxostoma angliorum | Ireland | 2007 | |
| Paralaeospira malardi | Ireland | 1977 | |
| Paralaeospira malardi | United Kingdom (Britain) / Celtic seas | 1999 | |
| Paralaeospira malardi | United Kingdom (Britain) / English Channel | 1999 | |
| Paraleucilla magna | Greece / Eastern Mediterranean | 2014 | |
| Paraleucilla magna | Italy / Adriatic Sea | 2007 | |
| Paraleucilla magna | Italy / Central Mediterranean | 2001 | |
| Paraleucilla magna | Italy / Western Mediterranean | 2004 | |
| Paraleucilla magna | Portugal / Azores | To 2006 | |
| Paraleucilla magna | Portugal / Iberian Coastal | To 2008 | |
| Paraleucilla magna | Portugal / Madeira | To 2007 | |
| Paralichthys lethostigma | Israel | 2009 | |
| Paralithodes camtschaticus | Italy / Central Mediterranean | 2008 | |
| Paralithodes camtschaticus | Norway / Barents Sea | 1977 | |
| Paralithodes camtschaticus | Russia / White Sea | 2010 | |
| Parametopella cypris | Italy / Adriatic Sea | 2014 | |
| Paramphiascella vararensis | Ukraine / Black Sea | From 1964 | |
| Paramysis (Mesomysis) intermedia | Estonia | 2008 | |
| Paramysis (Mesomysis) intermedia | Russia / Baltic Sea / Kaliningrad area | 2008 | |
| Paramysis (Serrapalpisis) lacustris | Germany / Baltic Sea | 2013 | |
| Paramysis (Serrapalpisis) lacustris | Latvia | 1966 | |
| Paramysis (Serrapalpisis) lacustris | Lithuania | 1962 | |
| Paramysis (Serrapalpisis) lacustris | Russia / Baltic Sea / Kaliningrad area | 1962 | |
| Paranais botniensis | Germany / North Sea | 1992 | |
| Paranais frici | Finland | 2000 - 2008 | |
| Paranais frici | Netherlands | To 2016 | |
| Paranais frici | Russia / Baltic Sea / Kaliningrad area | 1998 | |
| Paranais frici | Russia / Baltic Sea / St. Petersburg area | 1960 - 1969 | |
| Paranthura japonica | France / Biscay Gulf | 2007 | |
| Paranthura japonica | France / English Channel | 2019 | |
| Paranthura japonica | France / Western Mediterranean | 2014 | |
| Paranthura japonica | Greece / Eastern Mediterranean | 2012 | |
| Paranthura japonica | Italy / Adriatic Sea | 2005 | |
| Paranthura japonica | Italy / Central Mediterranean | 2013 | |
| Paranthura japonica | Italy / Western Mediterranean | 2010 - 2011 | |
| Paraonides nordica | Canada / Canadian Eastern Arctic | To 2011 | |
| Paraonides nordica | Canada / Hudson Bay Complex | To 2012 | |
| Paraphyllina ransoni | Turkey / Black Sea | 2011 | |
| Parapilumnus malardi | France / Celtic seas | 1910 | |
| Paraprionospio coora | Greece / Eastern Mediterranean | 1993 | |
| Paraprionospio coora | Spain / Iberian Coastal | To 2010 | |
| Parasagitta setosa | Russia / Caspian Sea | 2004 | |
| Parasmittina alba | Portugal / Madeira | 2014 | |
| Parasmittina egyptiaca | Israel | 2009 | |
| Parasmittina multiaviculata | Portugal / Madeira | 2014 | |
| Parasmittina protecta | Israel | 2010 | |
| Parasmittina protecta | Portugal / Madeira | 2010 | |
| Parasmittina trispinosa | Australia / Bass strait | 1950 | |
| Paratapes textilis | Israel | 1946 | |
| Paratapes textilis | Italy / Adriatic Sea | 2003 | |
| Paratenuisentis ambiguus | Germany / North Sea | To 1960 | |
| Paratenuisentis ambiguus | Poland | 2001 | |
| Paratenuisentis ambiguus | Russia / Baltic Sea / Kaliningrad area | 2004 | |
| Parexocoetus mento | Greece / Central Mediterranean | 1980 - 1987 | |
| Parexocoetus mento | Greece / Eastern Mediterranean | 1946 - 1964 | |
| Parexocoetus mento | Israel | 1935 | |
| Parkermavella globifera | Iceland | 1990 | |
| Parthenina cossmanni | Israel | 2016 | |
| Parthenina typica | Israel | 2015 | |
| Parupeneus forsskali | Greece / Eastern Mediterranean | 2017 | |
| Parupeneus forsskali | Israel | 2013 | |
| Parviphycus pannosus | Turkey / Black Sea | 2000 - 2009 | |
| Parvocalanus crassirostris | Croatia | 2014 | |
| Parvocalanus crassirostris | Greece / Eastern Mediterranean | 2009 | |
| Parvocalanus crassirostris | Italy / Adriatic Sea | 2016 | |
| Parvocaulis parvulus | Israel | 1935 | |
| Patella vulgata | Belgium | To 2011 | |
| Paucibranchia adenensis | Greece / Central Mediterranean | 2012 | |
| Paucibranchia adenensis | Greece / Eastern Mediterranean | 2009 | |
| Pegophysema philippiana | Israel | 2018 | |
| Pelates quadrilineatus | Israel | 1969 | |
| Pempheris rhomboidea | Greece / Eastern Mediterranean | 1983 | |
| Pempheris rhomboidea | Israel | 1979 | |
| Penaeus (Marsupenaeus) japonicus | China / Yellow Sea | To 2005 | |
| Penaeus (Marsupenaeus) japonicus | France / Biscay Gulf | 1980 | |
| Penaeus (Marsupenaeus) japonicus | France / Celtic seas | 1980 | |
| Penaeus (Marsupenaeus) japonicus | France / English Channel | 2016 | |
| Penaeus (Marsupenaeus) japonicus | France / Western Mediterranean | To 1972 | |
| Penaeus (Marsupenaeus) japonicus | Ireland | 2007 | |
| Penaeus (Marsupenaeus) japonicus | Italy / Adriatic Sea | 1979 | |
| Penaeus (Marsupenaeus) japonicus | Italy / Western Mediterranean | 1979 | |
| Penaeus (Marsupenaeus) japonicus | Portugal / Iberian Coastal | 1985 | |
| Penaeus (Marsupenaeus) japonicus | Turkey / Black Sea | 1960 - 1969 | |
| Penaeus (Marsupenaeus) japonicus | Ukraine / Black Sea | From 1977 | |
| Penaeus (Marsupenaeus) japonicus | United Kingdom (Britain) / English Channel | 1989 | |
| Penaeus aztecus | Belgium | 2018 | |
| Penaeus aztecus | France / Western Mediterranean | 2015 | |
| Penaeus aztecus | Greece / Adriatic Sea | 2018 | |
| Penaeus aztecus | Greece / Central Mediterranean | 2013 | |
| Penaeus aztecus | Greece / Eastern Mediterranean | 2012 | |
| Penaeus aztecus | Israel | 2015 | |
| Penaeus aztecus | Italy / Adriatic Sea | 2016 - 2017 | |
| Penaeus aztecus | Italy / Central Mediterranean | 2014 | |
| Penaeus aztecus | Italy / Western Mediterranean | 2014 | |
| Penaeus hathor | Greece / Eastern Mediterranean | 2012 | |
| Penaeus hathor | Israel | 1997 | |
| Penaeus pulchricaudatus | Greece / Eastern Mediterranean | 1995 | |
| Penaeus pulchricaudatus | Israel | 1951 | |
| Penaeus pulchricaudatus | Italy / Adriatic Sea | 1997 | |
| Penaeus semisulcatus | France / English Channel | 2016 | |
| Penaeus semisulcatus | Israel | 1951 | |
| Penaeus semisulcatus | Russia / Black Sea | 2005 | |
| Peneroplis arietinus | Italy / Central Mediterranean | 2017 | |
| Penilia avirostris | France / Western Mediterranean | 1959 | |
| Penilia avirostris | Germany / Baltic Sea | 2003 | |
| Penilia avirostris | Germany / North Sea | To 1948 | |
| Penilia avirostris | Iran / Caspian Sea | From 1982 | |
| Penilia avirostris | Sweden / North Sea | 1997 | |
| Penilia avirostris | United Kingdom (Britain) / North Sea | 1947 | |
| Perccottus glenii | Poland | 1993 | |
| Perccottus glenii | Russia / Baltic Sea / Kaliningrad area | 1982 | |
| Perccottus glenii | Russia / Baltic Sea / St. Petersburg area | 1916 - 1929 | |
| Percnon gibbesi | France / Western Mediterranean | 2014 | |
| Percnon gibbesi | Greece / Central Mediterranean | 2004 | |
| Percnon gibbesi | Greece / Eastern Mediterranean | 2004 | |
| Percnon gibbesi | Portugal / Iberian Coastal | To 1931 | |
| Perforatus perforatus | Belgium | To 2011 | |
| Perforatus perforatus | Portugal / Azores | To 2011 | |
| Peridiniella danica | Denmark / Baltic Sea | 1901 | |
| Peridiniella danica | Denmark / North Sea | 1901 | |
| Peridiniopsis polonicum | Bulgaria | 2008 | |
| Peridinium quadridentatum | Bulgaria | 2000 | |
| Peridinium quadridentatum | Denmark / Baltic Sea | 2005 | |
| Peridinium quadridentatum | Denmark / North Sea | 2005 | |
| Peridinium quadridentatum | Romania | 2008 | |
| Peridinium quadridentatum | Russia / Black Sea | 2005 | |
| Peridinium quadridentatum | Sweden / Baltic Sea | 2008 | |
| Peridinium quadridentatum | Sweden / North Sea | 2007 | |
| Perisesarma alberti | France / English Channel | 2016 | |
| Perkinsus chesapeaki | France / Biscay Gulf | To 1992 | |
| Perkinsus chesapeaki | France / Celtic seas | To 1992 | |
| Perkinsus chesapeaki | France / English Channel | To 1992 | |
| Perkinsus chesapeaki | France / North Sea | To 1992 | |
| Perkinsus chesapeaki | France / Western Mediterranean | To 1992 | |
| Perkinsus olsenii | France / Biscay Gulf | To 1992 | |
| Perkinsus olsenii | France / Celtic seas | 2005 | |
| Perkinsus olsenii | France / English Channel | To 1992 | |
| Perkinsus olsenii | France / North Sea | To 1992 | |
| Perkinsus olsenii | France / Western Mediterranean | To 1992 | |
| Perkinsus olsenii | Portugal / Iberian Coastal | 1987 | |
| Perkinsus olsenii | Spain / Iberian Coastal | 1983 | |
| Perkinsyllis augeneri | Israel | 2009 | |
| Perna perna | Israel | 1965 | |
| Perophora japonica | France / Celtic seas | 1982 | |
| Perophora japonica | France / English Channel | 1982 | |
| Perophora japonica | France / North Sea | 1996 | |
| Perophora japonica | Germany / North Sea | 2007 | |
| Perophora japonica | Ireland | 2012 | |
| Perophora japonica | Netherlands | 2004 | |
| Perophora japonica | Spain / Iberian Coastal | 2008 | |
| Perophora japonica | United Kingdom (Britain) / Celtic seas | 2003 | |
| Perophora japonica | United Kingdom (Britain) / English Channel | 2005 | |
| Perophora multiclathrata | France / Western Mediterranean | 1987 | |
| Perophora multiclathrata | Italy / Central Mediterranean | 2013 - 2014 | |
| Perophora viridis | France / Western Mediterranean | 1987 | |
| Perophora viridis | Italy / Adriatic Sea | 1973 - 1975 | |
| Perophora viridis | Italy / Western Mediterranean | To 1921 | |
| Perophora viridis | Portugal / Azores | To 1971 | |
| Petalonia binghamiae | Portugal / Azores | 1985 | |
| Petalonia fascia | Australia / Bass strait | 1971 | |
| Petricolaria pholadiformis | Belgium | 1899 | |
| Petricolaria pholadiformis | Denmark / Baltic Sea | 1926 | |
| Petricolaria pholadiformis | Denmark / North Sea | 1905 | |
| Petricolaria pholadiformis | France / English Channel | 1972 | |
| Petricolaria pholadiformis | France / North Sea | 1972 | |
| Petricolaria pholadiformis | Germany / Baltic Sea | 1927 | |
| Petricolaria pholadiformis | Germany / North Sea | 1896 | |
| Petricolaria pholadiformis | Greece / Eastern Mediterranean | 1985 | |
| Petricolaria pholadiformis | Netherlands | To 1899 | |
| Petricolaria pholadiformis | Norway / North Sea | To 1955 | |
| Petricolaria pholadiformis | Spain / Iberian Coastal | To 2007 | |
| Petricolaria pholadiformis | Sweden / North Sea | 1931 - 1944 | |
| Petricolaria pholadiformis | United Kingdom (Britain) / English Channel | 1893 | |
| Petricolaria pholadiformis | United Kingdom (Britain) / North Sea | 1893 | |
| Petroscirtes ancylodon | Greece / Eastern Mediterranean | 2004 | |
| Petroscirtes ancylodon | Israel | 1988 | |
| Petrospongium rugosum | Australia / Bass strait | 1971 | |
| Peyssonnelia conchicola | Australia / Bass strait | 1981 | |
| Peyssonnelia rosa-marina | Turkey / Black Sea | 2000 - 2009 | |
| Pfiesteria piscicida | Norway / North Sea | 2000 | |
| Pfiesteria shumwayae | Norway / North Sea | 2000 | |
| Phaenna spinifera | Romania | 1978 | |
| Phaeocystis pouchetii | Bulgaria | 1989 - 1990 | |
| Phaeocystis pouchetii | Denmark / Baltic Sea | 1980 | |
| Phaeocystis pouchetii | Denmark / North Sea | 1980 | |
| Phaeocystis pouchetii | Greece / Eastern Mediterranean | 1983 | |
| Phaeocystis pouchetii | Romania | 1990 - 1999 | |
| Phaeocystis pouchetii | Russia / Black Sea | 2006 | |
| Phaeocystis pouchetii | Sweden / Baltic Sea | To 1980 | |
| Phaeocystis pouchetii | Ukraine / Black Sea | 1990 | |
| Phallusia mammillata | France / English Channel | To 1900 | |
| Phallusia mammillata | France / North Sea | To 1900 | |
| Phallusia mammillata | Ireland | 1890 - 1920 | |
| Phallusia mammillata | Portugal / Madeira | 1992 - 1995 | |
| Phallusia nigra | Greece / Central Mediterranean | 2015 | |
| Phallusia nigra | Greece / Eastern Mediterranean | 2008 | |
| Phallusia nigra | Israel | 1952 | |
| Pherusella brevituba | Italy / Western Mediterranean | 1996 | |
| Phialella quadrata | Australia / Bass strait | 1915 | |
| Phidiana militaris | Israel | 2016 | |
| Philinopsis speciosa | Israel | 2009 | |
| Phorbas tenacior | Australia / Bass strait | 1989 | |
| Phorcus lineatus | Netherlands | To 1985 | |
| Photis lamellifera | Israel | To 1959 | |
| Photis lamellifera | Italy / Central Mediterranean | 1990 | |
| Phrix spatulata | Greece / Central Mediterranean | 2009 | |
| Phyllodicola petiti | United Kingdom (Britain) / Celtic seas | 1989 | |
| Phyllodoce groenlandica | Spain / Iberian Coastal | To 2016 | |
| Phyllodoce longifrons | Israel | 1972 | |
| Phyllopodopsyllus bradyi | Ukraine / Black Sea | 1969 | |
| Phyllorhiza punctata | Greece / Central Mediterranean | 2005 | |
| Phyllorhiza punctata | Israel | 1965 | |
| Phyllorhiza punctata | Italy / Western Mediterranean | 2009 | |
| Physa sp. | United Kingdom (Britain) / Celtic seas / Channel Islands | | |
| Physella acuta | Belgium | To 1869 | |
| Physella acuta | Germany / Baltic Sea | 2022 | |
| Physella acuta | Germany / North Sea | 1895 | |
| Physella acuta | Netherlands | To 2015 | |
| Piaractus brachypomus | Denmark / Baltic Sea | 2013 | |
| Piaractus brachypomus | Denmark / North Sea | 2013 | |
| Pigrogromitus timsanus | Israel | 1960 | |
| Pikea californica | Spain / Iberian Coastal | 1991 | |
| Pikea californica | United Kingdom (Britain) / Celtic seas | 1967 | |
| Pikea californica | United Kingdom (Britain) / English Channel | 1967 | |
| Pileolaria berkeleyana | France / Biscay Gulf | 2007 | |
| Pileolaria berkeleyana | France / English Channel | 2007 | |
| Pileolaria berkeleyana | France / Western Mediterranean | 1977 | |
| Pileolaria berkeleyana | Germany / North Sea | 2013 | |
| Pileolaria berkeleyana | Italy / Central Mediterranean | 2008 | |
| Pileolaria berkeleyana | Italy / Western Mediterranean | To 1995 | |
| Pileolaria berkeleyana | Netherlands | To 2010 | |
| Pileolaria berkeleyana | Portugal / Madeira | To 1980 | |
| Pileolaria berkeleyana | Spain / Canary Islands | To 1980 | |
| Pileolaria berkeleyana | United Kingdom (Britain) / Celtic seas / Channel Islands | 1982 | |
| Pileolaria berkeleyana | United Kingdom (Britain) / English Channel | 1974 | |
| Pileolaria militaris | Germany / North Sea | 2012 | |
| Pileolaria militaris | Ireland | 1977 | |
| Pileolaria militaris | United Kingdom (Britain) / Celtic seas | To 1977 | |
| Pileolaria militaris | United Kingdom (Britain) / English Channel | To 1977 | |
| Pilumnoides inglei | Ireland | To 1899 | |
| Pilumnopeus vauquelini | Israel | 1951 | |
| Pilumnus hirtellus | Sweden / North Sea | 2005 | |
| Pilumnus spinifer | Sweden / North Sea | To 2005 | |
| Pinctada imbricata radiata | France / Western Mediterranean | 1979 | |
| Pinctada imbricata radiata | Greece / Central Mediterranean | 1995 | |
| Pinctada imbricata radiata | Greece / Eastern Mediterranean | 1961 | |
| Pinctada imbricata radiata | Israel | 1899 | |
| Pinctada imbricata radiata | Italy / Central Mediterranean | 1961 | |
| Pinctada imbricata radiata | Italy / Western Mediterranean | To 1993 | |
| Pinctada imbricata radiata | Portugal / Azores | To 1998 | |
| Pinctada imbricata radiata | United Kingdom (Britain) / English Channel | 1986 | |
| Pinctada margaritifera | Italy / Central Mediterranean | 1890 - 1899 | |
| Pinguipes brasilianus | Italy / Central Mediterranean | 1990 | |
| Pinguipes brasilianus | Italy / Western Mediterranean | 1990 | |
| Pinnularia trevelyana | Ukraine / Black Sea | From 1902 | |
| Pisinna glabrata | United Kingdom (Britain) / English Channel | To 2010 | |
| Pista unibranchia | Italy / Central Mediterranean | 1981 | |
| Pista unibranchia | Italy / Western Mediterranean | 2018 | |
| Pista unibranchia | Spain / Iberian Coastal | To 2017 | |
| Plagiolemma distortum | France / Celtic seas | To 2014 | |
| Plagiolemma distortum | Germany / North Sea | To 2001 | |
| Plagiolemma distortum | Netherlands | To 2001 | |
| Plagiolemma distortum | United Kingdom (Britain) / English Channel | To 1992 | |
| Plagiolemma distortum | United Kingdom (Britain) / North Sea | To 2014 | |
| Plagusia squamosa | France / Western Mediterranean | 1873 | |
| Planaxis savignyi | Israel | 1997 | |
| Planiliza haematocheila | Greece / Eastern Mediterranean | 1995 | |
| Planogypsina acervalis | Greece / Eastern Mediterranean | 2001 | |
| Planorbarius corneus | Ireland | 1815 | |
| Platax teira | Israel | 2010 | |
| Platichthys flesus | Iceland | 1999 | |
| Platorchestia platensis | Denmark / Baltic Sea | 1860 | |
| Platorchestia platensis | Denmark / North Sea | 1860 | |
| Platorchestia platensis | France / English Channel | 1900 | |
| Platorchestia platensis | France / North Sea | 1900 | |
| Platorchestia platensis | Germany / Baltic Sea | 1940 | |
| Platorchestia platensis | Germany / North Sea | 1931 | |
| Platorchestia platensis | Netherlands | To 1950 | |
| Platorchestia platensis | Norway / North Sea | 1980 - 1989 | |
| Platorchestia platensis | Poland | 2005 | |
| Platorchestia platensis | Sweden / Baltic Sea | 1930 - 1940 | |
| Platorchestia platensis | Sweden / North Sea | To 1940 | |
| Platycephalus armatus | Spain / Canary Islands | To 2015 | |
| Platycephalus indicus | Israel | 1953 | |
| Platysiphonia caribaea | Spain / Canary Islands | 1980 - 1989 | |
| Plecoglossus altivelis altivelis | Ukraine / Azov Sea | 1960 - 1979 | |
| Plecoglossus altivelis altivelis | Ukraine / Black Sea | 1963 - 1979 | |
| Pleopis polyphaemoides | Russia / Caspian Sea | 1957 | |
| Pleurobranchus forskalii | Israel | 1975 | |
| Pleurosigma planctonicum | France / Celtic seas | 1966 | |
| Pleurosigma simonsenii | France / Celtic seas | 1966 | |
| Pleurosigma simonsenii | France / English Channel | 1966 | |
| Pleurosigma simonsenii | France / North Sea | 1966 | |
| Pleurosigma simonsenii | Germany / North Sea | To 2020 | |
| Pleurosigma simonsenii | Netherlands | 1974 | |
| Pleurosigma simonsenii | United Kingdom (Britain) / English Channel | To 1972 | |
| Plocamium secundatum | Italy / Central Mediterranean | 1991 | |
| Plocamopherus ocellatus | Israel | 1977 | |
| Plotosus lineatus | Israel | 2001 | |
| Plumatella casmiana | Germany / Baltic Sea | To 1886 | |
| Plumatella casmiana | Germany / North Sea | To 1995 | |
| Plumularia obliqua | Australia / Bass strait | 1884 | |
| Plumularia setacea | Australia / Bass strait | 1885 | |
| Podon intermedius | Russia / Caspian Sea | 1985 | |
| Poecilia reticulata | Germany / North Sea | 1980 - 1989 | |
| Poecilia reticulata | Netherlands | To 1985 | |
| Pollia dorbignyi | Portugal / Azores | To 1998 | |
| Pollicipes pollicipes | Ireland | 1820 - 1856 | |
| Polyandrocarpa zorritensis | Italy / Central Mediterranean | 2001 | |
| Polyandrocarpa zorritensis | Italy / Western Mediterranean | 1974 | |
| Polyandrocarpa zorritensis | Portugal / Madeira | 2014 | |
| Polycera hedgpethi | Australia / Bass strait | To 1989 | |
| Polycera hedgpethi | Italy / Adriatic Sea | 2009 | |
| Polycera hedgpethi | Italy / Central Mediterranean | 2012 | |
| Polycera hedgpethi | Italy / Western Mediterranean | 1986 | |
| Polycera hedgpethi | Spain / Iberian Coastal | 2002 | |
| Polycerella emertoni | Greece / Central Mediterranean | 1995 | |
| Polycerella emertoni | Italy / Western Mediterranean | 1964 | |
| Polycirrus twisti | Greece / Central Mediterranean | 2010 | |
| Polycirrus twisti | Greece / Eastern Mediterranean | 1983 | |
| Polyclinum aurantium | Portugal / Azores | To 1971 | |
| Polyclinum constellatum | Italy / Central Mediterranean | 2018 | |
| Polydora aggregata | Denmark / Baltic Sea | 2017 | |
| Polydora ciliata | France / Celtic seas | 1921 | |
| Polydora ciliata | France / English Channel | 1921 | |
| Polydora colonia | France / Biscay Gulf | 2021 | |
| Polydora colonia | Italy / Adriatic Sea | 2009 | |
| Polydora cornuta | Bulgaria | 1962 | |
| Polydora cornuta | Denmark / Baltic Sea | 1943 | |
| Polydora cornuta | Denmark / North Sea | 1941 | |
| Polydora cornuta | Greece / Eastern Mediterranean | 2008 | |
| Polydora cornuta | Italy / Adriatic Sea | 1990 - 1999 | |
| Polydora cornuta | Portugal / Iberian Coastal | To 2017 | |
| Polydora cornuta | Romania | 1970 - 1979 | |
| Polydora cornuta | Russia / Black Sea | 2009 | |
| Polydora cornuta | Ukraine / Black Sea | From 1962 | |
| Polydora hoplura | Belgium | To 1962 | |
| Polydora hoplura | France / English Channel | 1894 - 1921 | |
| Polydora hoplura | France / North Sea | To 1921 | |
| Polydora hoplura | Netherlands | To 1949 | |
| Polydora hoplura | New Zealand / New Zealand Shelf / North Island | To 1975 | |
| Polydora hoplura | New Zealand / New Zealand Shelf / South Island | To 1975 | |
| Polydora onagawaensis | France / English Channel | 2018 | |
| Polydora onagawaensis | Sweden / North Sea | To 2023 | |
| Polydora triglanda | France / Biscay Gulf | To 2017 | |
| Polydora triglanda | Spain / Iberian Coastal | To 2016 | |
| Polydora websteri | France / English Channel | 2018 | |
| Polydora websteri | Germany / North Sea | 2014 | |
| Polydora websteri | Netherlands | 2017 | |
| Polydora websteri | Romania | 1901 - 2000 | |
| Polydora websteri | Sweden / North Sea | 2020 | |
| Polylabris cf. mamaevi | Israel | 1971 | |
| Polyopes lancifolius | France / Biscay Gulf | 2008 | |
| Polyopes lancifolius | France / Celtic seas | 2008 | |
| Polyopes lancifolius | France / English Channel | 2021 | |
| Polysiphonia atlantica | France / Western Mediterranean | 1984 | |
| Polysiphonia atlantica | Greece / Central Mediterranean | 2001 | |
| Polysiphonia atlantica | Greece / Eastern Mediterranean | 1988 | |
| Polysiphonia atlantica | Israel | 2016 | |
| Polysiphonia morrowii | France / Biscay Gulf | To 2011 | |
| Polysiphonia morrowii | France / Celtic seas | To 2012 | |
| Polysiphonia morrowii | France / English Channel | 1970 - 1979 | |
| Polysiphonia morrowii | France / Western Mediterranean | 1997 | |
| Polysiphonia morrowii | Italy / Adriatic Sea | 1999 | |
| Polysiphonia morrowii | Italy / Central Mediterranean | 2012 | |
| Polysiphonia paniculata | France / Western Mediterranean | 1967 | |
| Polysiphonia paniculata | Italy / Central Mediterranean | To 2010 | |
| Polysiphonia paniculata | Italy / Western Mediterranean | To 2001 | |
| Polysiphonia paniculata | Turkey / Black Sea | 1972 | |
| Polysiphonia senticulosa | Australia / Bass strait | 1969 | |
| Polysiphonia senticulosa | Belgium | 2001 | |
| Polysiphonia senticulosa | France / English Channel | 2001 | |
| Polysiphonia senticulosa | France / North Sea | 2001 | |
| Polysiphonia senticulosa | Netherlands | 1993 | |
| Polysiphonia subtilissima | Australia / Bass strait | 1983 | |
| Polysiphonia subtilissima | Ireland | To 2006 | |
| Pomacanthus imperator | Greece / Eastern Mediterranean | 2006 | |
| Pomacanthus imperator | Israel | 2009 | |
| Pomadasys stridens | Greece / Eastern Mediterranean | 2019 | |
| Pomadasys stridens | Israel | 1971 | |
| Pomadasys stridens | Italy / Western Mediterranean | 1968 | |
| Pomatoschistus bathi | Georgia | 2000 - 2009 | |
| Pomatoschistus bathi | Ukraine / Black Sea | 2000 - 2009 | |
| Pontastacus leptodactylus | Netherlands | 1978 | |
| Pontogammarus robustoides | Estonia | 2006 | |
| Pontogammarus robustoides | Germany / Baltic Sea | 1994 | |
| Pontogammarus robustoides | Latvia | 1966 | |
| Pontogammarus robustoides | Lithuania | 1962 | |
| Pontogammarus robustoides | Poland | 1988 | |
| Pontogammarus robustoides | Russia / Baltic Sea / Kaliningrad area | 1962 - 1963 | |
| Pontogammarus robustoides | Russia / Baltic Sea / St. Petersburg area | 1999 | |
| Porcellidium ovatum | Ireland | 1980 - 1984 | |
| Poropila dubia | Bulgaria | 1948 | |
| Poropila dubia | Romania | 1948 | |
| Poropila dubia | Ukraine / Black Sea | 1948 | |
| Porphyra minor | Turkey / Black Sea | 2000 - 2009 | |
| Porphyra tenera | Spain / Iberian Coastal | To 1999 | |
| Porphyra umbilicalis | Turkey / Black Sea | 2000 - 2009 | |
| Porphyra yezoensis | France / Western Mediterranean | 1975 | |
| Portunus segnis | Greece / Eastern Mediterranean | 1991 | |
| Portunus segnis | Israel | 1924 | |
| Portunus segnis | Italy / Central Mediterranean | 1966 | |
| Portunus segnis | Italy / Western Mediterranean | 2004 | |
| Potamocorbula amurensis | France / Biscay Gulf | 2023 | |
| Potamopyrgus antipodarum | Belgium | 1927 | |
| Potamopyrgus antipodarum | Denmark / Baltic Sea | 1914 | |
| Potamopyrgus antipodarum | Denmark / North Sea | 1914 | |
| Potamopyrgus antipodarum | Estonia | 1850 - 1889 | |
| Potamopyrgus antipodarum | Finland | 1850 - 1899 | |
| Potamopyrgus antipodarum | France / Biscay Gulf | 1967 | |
| Potamopyrgus antipodarum | France / English Channel | 1984 | |
| Potamopyrgus antipodarum | France / North Sea | 1951 | |
| Potamopyrgus antipodarum | France / Western Mediterranean | 1948 | |
| Potamopyrgus antipodarum | Germany / Baltic Sea | 1887 | |
| Potamopyrgus antipodarum | Germany / North Sea | 1900 | |
| Potamopyrgus antipodarum | Ireland | To 1897 | |
| Potamopyrgus antipodarum | Latvia | 1801 - 1889 | |
| Potamopyrgus antipodarum | Lithuania | 1954 | |
| Potamopyrgus antipodarum | Netherlands | 1913 | |
| Potamopyrgus antipodarum | Norway / North Sea | 1952 | |
| Potamopyrgus antipodarum | Norway / Norwegian Sea | To 2012 | |
| Potamopyrgus antipodarum | Poland | 1933 | |
| Potamopyrgus antipodarum | Portugal / Iberian Coastal | To 1978 | |
| Potamopyrgus antipodarum | Russia / Baltic Sea / Kaliningrad area | 1917 - 1926 | |
| Potamopyrgus antipodarum | Russia / Baltic Sea / St. Petersburg area | 1930 - 1939 | |
| Potamopyrgus antipodarum | Spain / Iberian Coastal | 1801 - 1900 | |
| Potamopyrgus antipodarum | Sweden / Baltic Sea | 1887 | |
| Potamopyrgus antipodarum | Sweden / North Sea | 1887 | |
| Potamopyrgus antipodarum | United Kingdom (Britain) / Celtic seas | 1859 | |
| Potamopyrgus antipodarum | United Kingdom (Britain) / English Channel | 1859 | |
| Potamopyrgus antipodarum | United Kingdom (Britain) / North Sea | 1859 | |
| Potamopyrgus antipodarum | United Kingdom (Britain) / North Sea / Orkney Islands | To 1938 | |
| Potamothrix bavaricus | Germany / Baltic Sea | To 2015 | |
| Potamothrix bavaricus | Netherlands | To 2016 | |
| Potamothrix bavaricus | Russia / Baltic Sea / Kaliningrad area | 1997 | |
| Potamothrix bedoti | Sweden / Baltic Sea | 1915 | |
| Potamothrix hammoniensis | Germany / North Sea | To 2017 | |
| Potamothrix hammoniensis | Poland | 2010 | |
| Potamothrix heuscheri | Finland | 1960 - 1970 | |
| Potamothrix heuscheri | Russia / Baltic Sea / St. Petersburg area | 1960 - 1969 | |
| Potamothrix heuscheri | Sweden / Baltic Sea | 1960 - 1969 | |
| Potamothrix moldaviensis | Germany / Baltic Sea | To 2015 | |
| Potamothrix moldaviensis | Germany / North Sea | To 2015 | |
| Potamothrix moldaviensis | Poland | 2008 | |
| Potamothrix moldaviensis | Russia / Baltic Sea / Kaliningrad area | 1996 | |
| Potamothrix moldaviensis | Russia / Baltic Sea / St. Petersburg area | 1950 - 1959 | |
| Potamothrix vejdovskyi | Belgium | To 2009 | |
| Potamothrix vejdovskyi | Germany / North Sea | To 2015 | |
| Potamothrix vejdovskyi | Poland | 2008 | |
| Potamothrix vejdovskyi | Russia / Baltic Sea / Kaliningrad area | 1997 | |
| Potamothrix vejdovskyi | Russia / Baltic Sea / St. Petersburg area | 1960 - 1969 | |
| Potamothrix vejdovskyi | Sweden / Baltic Sea | 1967 - 1970 | |
| Praunus flexuosus | Iceland | 1970 | |
| Predaea huismanii | Spain / Canary Islands | 1980 - 1989 | |
| Priacanthus sagittarius | Israel | 2009 | |
| Primavelans glabricollaris | Germany / North Sea | 2019 | |
| Primavelans glabricollaris | Netherlands | To 2019 | |
| Prionace glauca | Romania | 1940 - 1949 | |
| Prionospio aluta | Portugal / Iberian Coastal | To 2017 | |
| Prionospio pulchra | Greece / Eastern Mediterranean | 1991 | |
| Prionospio pulchra | Portugal / Iberian Coastal | To 2012 | |
| Prionospio pulchra | Spain / Iberian Coastal | To 2000 | |
| Prionospio pulchra | Turkey / Black Sea | 2000 | |
| Proameira simplex | Ukraine / Black Sea | From 1964 | |
| Proasellus coxalis | Belgium | To 1998 | |
| Proasellus coxalis | Germany / Baltic Sea | 2011 | |
| Proasellus coxalis | Germany / North Sea | 1930 - 1939 | |
| Proboscia indica | Germany / North Sea | 1966 - 1971 | |
| Proboscia indica | Netherlands | 1990 | |
| Procambarus acutus | Netherlands | 2002 | |
| Procambarus clarkii | Belgium | To 2014 | |
| Procambarus clarkii | France / Biscay Gulf | 1970 - 1979 | |
| Procambarus clarkii | France / English Channel | 1970 - 1979 | |
| Procambarus clarkii | Germany / North Sea | 1985 | |
| Procambarus clarkii | Italy / Adriatic Sea | 2007 | |
| Procambarus clarkii | Italy / Western Mediterranean | To 2000 | |
| Procambarus clarkii | Netherlands | 1985 | |
| Procambarus clarkii | Portugal / Azores | To 1994 | |
| Procambarus clarkii | Portugal / Iberian Coastal | 1979 | |
| Procambarus clarkii | Spain / Canary Islands | 1996 - 1997 | |
| Procambarus clarkii | Spain / Spain | 1973 - 1974 | |
| Procambarus fallax f. virginalis | Belgium | 2020 | |
| Procambarus fallax f. virginalis | France / North Sea | 2019 | |
| Procambarus fallax f. virginalis | Germany / North Sea | 2003 | |
| Procambarus fallax f. virginalis | Netherlands | To 2004 | |
| Proceraea cornuta | Netherlands | 1941 | |
| Proceraea cornuta | United Kingdom (Britain) / English Channel | 1929 | |
| Pronoctiluca pelagica | Ukraine / Black Sea | From 1983 | |
| Prorocentrum borbonicum | Greece / Eastern Mediterranean | 2004 | |
| Prorocentrum cordatum | Belgium | To 2006 | |
| Prorocentrum cordatum | Bulgaria | 1948 | |
| Prorocentrum cordatum | Denmark / Baltic Sea | 1981 | |
| Prorocentrum cordatum | Denmark / North Sea | To 1979 | |
| Prorocentrum cordatum | Estonia | 1997 | |
| Prorocentrum cordatum | Finland | 1993 | |
| Prorocentrum cordatum | France / Biscay Gulf | To 1987 | |
| Prorocentrum cordatum | France / Celtic seas | To 1987 | |
| Prorocentrum cordatum | France / English Channel | To 1987 | |
| Prorocentrum cordatum | France / Western Mediterranean | 1984 | |
| Prorocentrum cordatum | Georgia | 1999 | |
| Prorocentrum cordatum | Germany / Baltic Sea | 1982 | |
| Prorocentrum cordatum | Germany / North Sea | 1990 | |
| Prorocentrum cordatum | Latvia | 1988 | |
| Prorocentrum cordatum | Lithuania | 1992 | |
| Prorocentrum cordatum | Netherlands | To 2006 | |
| Prorocentrum cordatum | Norway / North Sea | 1979 | |
| Prorocentrum cordatum | Poland | 1989 | |
| Prorocentrum cordatum | Romania | 1948 | |
| Prorocentrum cordatum | Russia / Baltic Sea / Kaliningrad area | 2010 | |
| Prorocentrum cordatum | Russia / Baltic Sea / St. Petersburg area | 2000 - 2010 | |
| Prorocentrum cordatum | Russia / Black Sea | 1948 | |
| Prorocentrum cordatum | Sweden / Baltic Sea | 1982 | |
| Prorocentrum cordatum | Sweden / North Sea | 1979 | |
| Prorocentrum cordatum | Ukraine / Azov Sea | From 1948 | |
| Prorocentrum cordatum | Ukraine / Black Sea | From 1948 | |
| Prorocentrum cordatum | United Kingdom (Britain) / English Channel | 1976 | |
| Prorocentrum dentatum | Georgia | 2001 | |
| Prorocentrum dentatum | Ukraine / Black Sea | 1998 | |
| Prorocentrum emarginatum | Greece / Eastern Mediterranean | 2003 | |
| Prorocentrum gracile | Denmark / Baltic Sea | 1989 | |
| Prorocentrum gracile | Denmark / North Sea | 1989 | |
| Prorocentrum levis | Greece / Eastern Mediterranean | 2004 | |
| Prorocentrum lima | Denmark / Baltic Sea | 1989 | |
| Prorocentrum lima | Denmark / North Sea | 1989 | |
| Prorocentrum lima | France / Biscay Gulf | To 1987 | |
| Prorocentrum lima | France / English Channel | To 1987 | |
| Prorocentrum mexicanum | France / English Channel | 1995 | |
| Prorocentrum triestinum | Denmark / Baltic Sea | 1983 | |
| Prorocentrum triestinum | Denmark / North Sea | 1899 | |
| Prorocentrum triestinum | Germany / North Sea | 1992 | |
| Prorocentrum triestinum | Netherlands | 1961 | |
| Proterorhinus marmoratus | Russia / Baltic Sea / St. Petersburg area | 2006 | |
| Proterorhinus nasalis | Estonia | 2020 | |
| Proterorhinus nasalis | Finland | 2022 | |
| Protoceratium reticulatum | Netherlands | To 2014 | |
| Protocystis swerei | Ukraine / Black Sea | 1950 - 1959 | |
| Protodorvillea biarticulata | Greece / Central Mediterranean | 1983 | |
| Protodorvillea biarticulata | Greece / Eastern Mediterranean | 1975 | |
| Protodorvillea egena | Italy / Central Mediterranean | 2001 | |
| Protomonostroma undulatum | Denmark / Baltic Sea | 1973 | |
| Protomonostroma undulatum | Denmark / North Sea | 1973 | |
| Protomonostroma undulatum | Germany / North Sea | To 1954 | |
| Protoperidinium minutum | Georgia | 1999 | |
| Protoperidinium minutum | Russia / Black Sea | 2001 | |
| Protoperidinium parthenopes | Russia / Black Sea | 2001 | |
| Psammacoma gubernaculum | Israel | 2008 | |
| Psammoryctides moravicus | Belgium | To 2008 | |
| Pseudechidna brummeri | Portugal / Iberian Coastal | To 2023 | |
| Pseudo-nitzschia australis | France / Biscay Gulf | To 2013 | |
| Pseudo-nitzschia australis | France / English Channel | 2004 | |
| Pseudo-nitzschia calliantha | Turkey / Black Sea | 2007 - 2008 | |
| Pseudo-nitzschia calliantha | Ukraine / Black Sea | 2006 | |
| Pseudo-nitzschia inflatula | Ukraine / Black Sea | 1990 - 1999 | |
| Pseudo-nitzschia multistriata | France / Biscay Gulf | 2002 | |
| Pseudo-nitzschia multistriata | Portugal / Iberian Coastal | To 2003 | |
| Pseudo-nitzschia obtusa | Russia / Caspian Sea | 1990 | |
| Pseudo-nitzschia pungens | Russia / Black Sea | 2000 | |
| Pseudobacciger harengulae | Sweden / North Sea | 1994 | |
| Pseudobiceros stellae | Israel | 2016 | |
| Pseudoceros duplicinctus | Israel | 2015 | |
| Pseudochattonella farcimen | France / Biscay Gulf | 2012 | |
| Pseudochattonella farcimen | France / English Channel | 1994 | |
| Pseudochattonella farcimen | Germany / North Sea | To 1998 | |
| Pseudochattonella farcimen | Norway / North Sea | To 2010 | |
| Pseudochattonella farcimen | Poland | To 2001 | |
| Pseudochattonella verruculosa | Denmark / Baltic Sea | To 2015 | |
| Pseudochattonella verruculosa | Denmark / North Sea | 1998 | |
| Pseudochattonella verruculosa | Germany / North Sea | 1998 | |
| Pseudochattonella verruculosa | Greece / Central Mediterranean | 1998 | |
| Pseudochattonella verruculosa | Greece / Eastern Mediterranean | 2000 - 2001 | |
| Pseudochattonella verruculosa | Norway / North Sea | 1998 | |
| Pseudocuma (Stenocuma) graciloides | Russia / Baltic Sea / St. Petersburg area | 2004 | |
| Pseudodactylogyrus anguillae | Denmark / Baltic Sea | 1985 | |
| Pseudodactylogyrus anguillae | Denmark / North Sea | 1985 | |
| Pseudodactylogyrus anguillae | France / Biscay Gulf | 1984 | |
| Pseudodactylogyrus anguillae | France / Celtic seas | 1984 | |
| Pseudodactylogyrus anguillae | France / English Channel | 1984 | |
| Pseudodactylogyrus anguillae | France / North Sea | 1984 | |
| Pseudodactylogyrus anguillae | France / Western Mediterranean | 1984 | |
| Pseudodactylogyrus anguillae | Germany / North Sea | To 1995 | |
| Pseudodactylogyrus anguillae | Norway / North Sea | 1990 - 1999 | |
| Pseudodactylogyrus anguillae | Poland | 1985 | |
| Pseudodactylogyrus anguillae | Russia / Baltic Sea / Kaliningrad area | 2002 | |
| Pseudodactylogyrus anguillae | Sweden / North Sea | 1985 | |
| Pseudodactylogyrus bini | Germany / North Sea | To 1995 | |
| Pseudodactylogyrus bini | Norway / North Sea | 1990 - 1999 | |
| Pseudodactylogyrus bini | Poland | 1985 | |
| Pseudodiaptomus marinus | Belgium | 2015 | |
| Pseudodiaptomus marinus | Denmark / Baltic Sea | 2021 | |
| Pseudodiaptomus marinus | Denmark / North Sea | 2018 | |
| Pseudodiaptomus marinus | France / Biscay Gulf | 2010 | |
| Pseudodiaptomus marinus | France / English Channel | 2010 | |
| Pseudodiaptomus marinus | France / North Sea | 2010 | |
| Pseudodiaptomus marinus | France / Western Mediterranean | 2008 | |
| Pseudodiaptomus marinus | Germany / North Sea | 2011 | |
| Pseudodiaptomus marinus | Italy / Adriatic Sea | 2007 | |
| Pseudodiaptomus marinus | Italy / Central Mediterranean | 2008 | |
| Pseudodiaptomus marinus | Italy / Western Mediterranean | 2008 | |
| Pseudodiaptomus marinus | Netherlands | 2011 | |
| Pseudodiaptomus marinus | Portugal / Iberian Coastal | To 2020 | |
| Pseudodiaptomus marinus | Spain / Iberian Coastal | To 2020 | |
| Pseudodiaptomus marinus | United Kingdom (Britain) / English Channel | To 2011 | |
| Pseudolithoderma roscoffense | United Kingdom (Britain) / English Channel | 1973 | |
| Pseudominolia nedyma | Israel | 1966 | |
| Pseudomyicola spinosus spinosus | France / Biscay Gulf | 1963 | |
| Pseudomyicola spinosus spinosus | France / Celtic seas | 1963 | |
| Pseudomyicola spinosus spinosus | France / Western Mediterranean | 1951 | |
| Pseudonereis anomala | Greece / Central Mediterranean | 2003 | |
| Pseudonereis anomala | Greece / Eastern Mediterranean | 2003 | |
| Pseudonereis anomala | Israel | 1937 | |
| Pseudonereis anomala | Italy / Central Mediterranean | 2013 | |
| Pseudopolydora kempi japonica | France / Biscay Gulf | 2004 | |
| Pseudopolydora paucibranchiata | Australia / Bass strait | 1978 | |
| Pseudopolydora paucibranchiata | Faroe Islands | 1987 | |
| Pseudopolydora paucibranchiata | Greece / Eastern Mediterranean | 2005 | |
| Pseudopolydora paucibranchiata | Italy / Western Mediterranean | 1977 | |
| Pseudopolydora paucibranchiata | Netherlands | To 2015 | |
| Pseudopolydora paucibranchiata | Norway / North Sea | To 1979 | |
| Pseudopolydora paucibranchiata | Norway / Norwegian Sea | To 1991 | |
| Pseudopolydora paucibranchiata | Portugal / Iberian Coastal | 2005 | |
| Pseudopolydora paucibranchiata | Spain / Iberian Coastal | To 2011 | |
| Pseudopolydora paucibranchiata | United Kingdom (Britain) / Celtic seas | To 1960 | |
| Pseudorhaphitoma iodolabiata | Israel | 2010 | |
| Pseudosolenia calcar-avis | Bulgaria | 1926 | |
| Pseudosolenia calcar-avis | Denmark / Baltic Sea | 2009 | |
| Pseudosolenia calcar-avis | Denmark / North Sea | 2009 | |
| Pseudosolenia calcar-avis | Georgia | 1993 | |
| Pseudosolenia calcar-avis | Germany / Baltic Sea | To 2010 | |
| Pseudosolenia calcar-avis | Romania | 1900 - 1909 | |
| Pseudosolenia calcar-avis | Russia / Black Sea | 1926 | |
| Pseudosolenia calcar-avis | Russia / Caspian Sea | 1934 | |
| Pseudosolenia calcar-avis | Turkey / Black Sea | 1996 | |
| Pseudosolenia calcar-avis | Ukraine / Azov Sea | From 1924 | |
| Pseudosolenia calcar-avis | Ukraine / Black Sea | From 1924 | |
| Psiloteredo megotara | Belgium | To 1600 | |
| Psiloteredo megotara | Denmark / Baltic Sea | To 1944 | |
| Psiloteredo megotara | Denmark / North Sea | To 1937 | |
| Psiloteredo megotara | France / English Channel | To 1600 | |
| Psiloteredo megotara | France / North Sea | To 1600 | |
| Psiloteredo megotara | Germany / North Sea | To 1937 | |
| Psiloteredo megotara | Netherlands | To 1912 | |
| Psiloteredo megotara | Norway / North Sea | To 1962 | |
| Psiloteredo megotara | Norway / Norwegian Sea | To 1949 | |
| Psiloteredo megotara | Portugal / Azores | To 1940 | |
| Psiloteredo megotara | Portugal / Madeira | To 1940 | |
| Psiloteredo megotara | Sweden / North Sea | To 1977 | |
| Psiloteredo megotara | United Kingdom (Britain) / English Channel | To 1967 | |
| Psiloteredo megotara | United Kingdom (Britain) / North Sea / Orkney Islands | 1950 - 1955 | |
| Pteragogus trispilus | Greece / Central Mediterranean | 2008 - 2009 | |
| Pteragogus trispilus | Greece / Eastern Mediterranean | 1992 | |
| Pteragogus trispilus | Israel | 1991 | |
| Pteria hirundo | Romania | 2002 | |
| Pterocladiella capillacea | Australia / Bass strait | 1966 | |
| Pterocladiella melanoidea | Turkey / Black Sea | 1990 - 1999 | |
| Pterois miles | Greece / Central Mediterranean | 2018 | |
| Pterois miles | Greece / Eastern Mediterranean | 2009 | |
| Pterois miles | Israel | 1991 | |
| Pterois miles | Italy / Central Mediterranean | 2016 | |
| Pterosiphonia pinnulata | France / Biscay Gulf | 1993 | |
| Pterosiphonia pinnulata | France / English Channel | 1993 | |
| Pterosiphonia pinnulata | Portugal / Azores | 2005 - 2007 | |
| Pterosiphonia pinnulata | United Kingdom (Britain) / Celtic seas | | |
| Pterosiphonia pinnulata | United Kingdom (Britain) / English Channel | | |
| Pterosiphonia tanakae | France / Biscay Gulf | 2005 | |
| Pterosiphonia tanakae | France / English Channel | 2008 | |
| Pterosperma cristatum | Romania | 1970 | |
| Pterosperma cristatum | Ukraine / Black Sea | From 1948 | |
| Pterosperma joergenseni | Bulgaria | 1948 | |
| Pterosperma joergenseni | Romania | 1948 | |
| Pterosperma joergenseni | Ukraine / Black Sea | From 1948 | |
| Ptilohyale explorator | France / Biscay Gulf | 1989 | |
| Ptilohyale littoralis | Belgium | To 2018 | |
| Ptilohyale littoralis | France / English Channel | 2014 | |
| Ptilohyale littoralis | France / North Sea | 2014 | |
| Ptilohyale littoralis | Italy / Adriatic Sea | 2023 | |
| Ptilohyale littoralis | Netherlands | 2009 | |
| Puellina innominata | Spain / Canary Islands | To 2003 | |
| Punctaria latifolia | Australia / Bass strait | 1971 | |
| Punctaria tenuissima | France / Western Mediterranean | 1970 | |
| Punctaria tenuissima | Turkey / Black Sea | 1993 | |
| Purpuradusta gracilis notata | Israel | 1981 | |
| Pycnoclavella taureanensis | Portugal / Madeira | To 1998 | |
| Pylaiella littoralis | Australia / Bass strait | 1971 | |
| Pylaiella littoralis | France / Biscay Gulf | 1964 | |
| Pylaiella littoralis | France / English Channel | 1964 | |
| Pylaiella littoralis | France / North Sea | 1984 | |
| Pylaiella littoralis | France / Western Mediterranean | 1985 | |
| Pylaiella littoralis | Greece / Central Mediterranean | 1975 | |
| Pylaiella littoralis | Greece / Eastern Mediterranean | 1967 | |
| Pylaiella littoralis | Turkey / Black Sea | 1998 | |
| Pyramimonas longicauda | Ukraine / Black Sea | From 2001 | |
| Pyrgulina fischeri | Israel | 1974 | |
| Pyrgulina nana | Israel | 2018 | |
| Pyrgulina pirinthella | Israel | 1984 | |
| Pyrgulina pupaeformis | Israel | 1935 | |
| Pyrodinium bahamense | Spain / Iberian Coastal | To 2008 | |
| Pyromaia tuberculata | Australia / Bass strait | 1995 | |
| Pyropia koreana | Greece / Eastern Mediterranean | 2000 | |
| Pyropia koreana | Israel | 2017 | |
| Pyropia leucosticta | Iceland | 1979 | |
| Pyropia njordii | Iceland | 2005 | |
| Pyrunculus fourierii | Greece / Eastern Mediterranean | 2013 | |
| Pyrunculus fourierii | Israel | 1989 | |
| Pyura tessellata | Portugal / Azores | To 1971 | |
