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  1. Acartia (Acanthacartia) tonsa Dana, 1849 non-native

    Species, Crustacean, Marine, terrestrial

    Species list: INNS of Interest to Wales June 2022

    Species list: MSFD - UK priority species

    Species list: UK Marine priority NIS list (2020)

    Species list: WFD UKTAG aquatic alien species impact

    Species list: Non-native species of interest to Northern Ireland

  2. Acartia (Acartiura) margalefi Alcaraz, 1976 non-native

    Species, Crustacean, Marine, terrestrial

  3. Achtheres percarum Nordmann, 1832 non-native

    Species, Crustacean, Freshwater, marine, terrestrial

    Species list: INNS of Interest to Wales June 2022

    Species list: WFD UKTAG aquatic alien species impact

    Species list: Non-native species of interest to Northern Ireland

  4. Amphibalanus amphitrite (Darwin, 1854) non-native

    Species, Crustacean, Marine

    Species list: INNS of Interest to Wales June 2022

    Species list: MSFD - UK priority species

    Species list: UK Marine priority NIS list (2020)

    Species list: WFD UKTAG aquatic alien species impact

    Species list: Wales Marine Priority INNS

    Species list: Non-native species of interest to Northern Ireland

  5. Amphibalanus improvisus (Darwin, 1854) non-native

    Species, Crustacean, Marine

  6. Arcitalitrus dorrieni (Hunt, 1925) – Landhopper non-native

    Species, Crustacean, Marine, terrestrial

  7. Argulus japonicus Thiele, 1900 non-native

    Species, Crustacean, Terrestrial

  8. Astacus astacus (Linnaeus, 1758) – Noble Crayfish non-native

    Species, Crustacean, Freshwater, terrestrial

    Species list: Wildlife and Countryside Act 1981 - Schedule 9 (GB)

    Species list: INNS of Interest to Wales June 2022

    Species list: WFD UKTAG aquatic alien species impact

    Species list: Non-native species of interest to Northern Ireland

    Species list: INNS Alert list for Northern Ireland

  9. Astacus leptodactylus Eschscholtz, 1823 – Turkish Crayfish non-native

    Species, Crustacean, Freshwater, terrestrial

    Species list: Wildlife and Countryside Act 1981 - Schedule 9 (GB)

    Species list: INNS of Interest to Wales June 2022

    Species list: WFD UKTAG aquatic alien species impact

    Species list: Non-native species of interest to Northern Ireland

    Species list: INNS Alert list for Northern Ireland

  10. Austrominius modestus (Darwin, 1854) non-native

    Species, Crustacean, Marine

    Species list: INNS of Interest to Wales June 2022

    Species list: WFD UKTAG aquatic alien species impact

    Species list: Non-native species of interest to Northern Ireland

  11. Brachynotus sexdentatus (Risso, 1827) non-native

    Species, Crustacean, Marine

    Species list: Non-native species of interest to Northern Ireland

  12. Caecidotea communis (Say, 1818) non-native

    Species, Crustacean, Freshwater, marine, terrestrial

    Species list: INNS of Interest to Wales June 2022

    Species list: WFD UKTAG aquatic alien species impact

    Species list: Non-native species of interest to Northern Ireland

  13. Callinectes sapidus Rathbun, 1896 – Blue Crab non-native

    Species, Crustacean, Marine

    Species list: Non-native species of interest to Northern Ireland

  14. Caprella mutica Schurin, 1935 – Japanese Skeleton Shrimp non-native

    Species, Crustacean, Marine

    Species list: INNS of Interest to Wales June 2022

    Species list: MSFD - UK priority species

    Species list: UK Marine priority NIS list (2020)

    Species list: WFD UKTAG aquatic alien species impact

    Species list: Wales Marine Priority INNS

    Species list: Non-native species of interest to Northern Ireland

    Species list: INNS Alert list for Northern Ireland

  15. Cercopagis pengoi (Ostroumov, 1891) – Fishhook Waterflea non-native

    Species, Crustacean, Marine

    Species list: INNS of Interest to Wales June 2022

    Species list: WFD UKTAG Alarm species

    Species list: Non-native species of interest to Northern Ireland

    Species list: WFD UKTAG 2015 Alien Species Alarm list

    Species list: WFD UKTAG 2015 Alien Species Alarm list

    Species list: Invasive Species Northern Ireland

  16. Chaetogammarus warpachowskyi Sars, 1897 non-native

    Species, Crustacean, Marine

  17. Chelicorophium chelicorne (G.O. Sars, 1895) non-native

    Species, Crustacean, Freshwater, marine

  18. Chelicorophium curvispinum (G.O. Sars, 1895) non-native

    Species, Crustacean, Freshwater, marine, terrestrial

    Species list: INNS of Interest to Wales June 2022

    Species list: WFD UKTAG aquatic alien species impact

    Species list: Non-native species of interest to Northern Ireland

  19. Chelicorophium robustum (G.O. Sars, 1895) non-native

    Species, Crustacean, Freshwater, marine

    Species list: Non-native species of interest to Northern Ireland

    Species list: WFD UKTAG 2015 Alien Species Alarm list

  20. Crangonyx pseudogracilis/floridanus sens. lat. non-native

    Species sensu lato, Crustacean, Freshwater, terrestrial