| Species |
Recipient region |
Date of the first record |
|
| Ianiropsis serricaudis | France / Biscay Gulf | 2013 |  |
| Ianiropsis serricaudis | France / English Channel | 2019 | |
| Ianiropsis serricaudis | France / Western Mediterranean | From 2015 | |
| Ianiropsis serricaudis | Germany / North Sea | 2022 | |
| Ianiropsis serricaudis | Italy / Adriatic Sea | 2012 | |
| Ianiropsis serricaudis | Italy / Western Mediterranean | 2014 | |
| Ianiropsis serricaudis | Netherlands | 2000 | |
| Ianiropsis serricaudis | United Kingdom (Britain) / English Channel | 2004 | |
| Ictalurus punctatus | Estonia | 2001 | |
| Idyella pallidula | Ukraine / Black Sea | From 1964 | |
| Imogine necopinata | Netherlands | To 2005 | |
| Incisocalliope aestuarius | Belgium | To 1991 | |
| Incisocalliope aestuarius | France / Biscay Gulf | 2015 | |
| Incisocalliope aestuarius | Germany / North Sea | To 2016 | |
| Incisocalliope aestuarius | Netherlands | 1991 | |
| Indothais lacera | Israel | 1928 | |
| Indothais lacera | Italy / Western Mediterranean | 1983 | |
| Indothais sacellum | Israel | 2004 | |
| Iphigenella shablensis | Russia / Caspian Sea | 1969 | |
| Iphione muricata | Israel | 2015 | |
| Iridaea sp | Ireland | 1972 | |
| Isochrysis spp. | Ireland | 1970 - 1979 | |
| Isognomon bicolor | Italy / Central Mediterranean | 2017 - 2019 | |
| Isognomon bicolor | Italy / Western Mediterranean | 2020 | |
| Isognomon legumen | Greece / Eastern Mediterranean | 2016 | |
| Isognomon legumen | Israel | 2015 | |
| Isognomon radiatus | Ireland | 1996 | |
| Isolda pulchella | Portugal / Iberian Coastal | To 2017 | |
| Istiblennius meleagris | Israel | 2016 | |
| Ixa monodi | Greece / Eastern Mediterranean | 1999 | |
| Ixa monodi | Israel | 1977 | |
