Public domain: Introduction events' accounts (23 / 5523)
| Species |
Recipient region |
Date of the first record |
|
| Womersleyella setacea | Italy / Central Mediterranean | 1993 |  |
| Womersleyella setacea | Italy / Western Mediterranean | 1986 | |
| Womersleyella setacea | Spain / Iberian Coastal | To 2011 | |
| Xanthias lamarckii | Greece / Eastern Mediterranean | 2013 | |
| Xenostrobus securis | France / Western Mediterranean | 2006 | |
| Xenostrobus securis | Italy / Adriatic Sea | 1991 | |
| Xenostrobus securis | Italy / Western Mediterranean | 2006 | |
| Xenostrobus securis | Spain / Iberian Coastal | 2006 | |
| Xylophaga dorsalis | Greece / Eastern Mediterranean | 1800 - 1883 | |
| Xylophaga praestans | Greece / Eastern Mediterranean | 1987 | |
| Yoldia limatula | Belgium | To 2020 | |
| Yoldia limatula | France / English Channel | To 2021 | |
| Yoldia limatula | Netherlands | 2019 | |
| Zafra savignyi | Israel | 1952 | |
| Zafra selasphora | Israel | 1976 | |
| Zebrasoma xanthurum | Italy / Western Mediterranean | 2015 | |
| Zebrus zebrus | Ukraine / Black Sea | 2009 | |
| Zeuxo holdichi | France / Biscay Gulf | 1987 | |
| Zeuxo holdichi | France / English Channel | 1996 | |
| Zeuxo holdichi | Italy / Adriatic Sea | 2019 | |
| Zeuxo holdichi | Netherlands | 2012 | |
| Zygoceros rhombus | Denmark / Baltic Sea | 1983 | |
| Zygoceros rhombus | Denmark / North Sea | 1983 | |
