| Species |
Recipient region |
Date of the first record |
|
| 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 | |
