Irish Exclusive economic Zone for Abietinaria abietina (Linnaeus, 1758) 
Irish Exclusive economic Zone for Abludomelita obtusata (Montagu, 1813) 
Irish Exclusive economic Zone for Abra alba (W. Wood, 1802) 
Irish Exclusive economic Zone for Abra nitida (O. F. Müller, 1776) 
Irish Exclusive economic Zone for Abra prismatica (Montagu, 1808) 
Irish Exclusive economic Zone for Abra tenuis (Montagu, 1803) 
Irish Exclusive economic Zone for Abyssoninoe hibernica (McIntosh, 1903) 
Irish Exclusive economic Zone for Acanthicolepis asperrima (M. Sars, 1861) 
Irish Exclusive economic Zone for Acanthocardia echinata (Linnaeus, 1758) 
Irish Exclusive economic Zone for Acanthocardia tuberculata (Linnaeus, 1758) 
Irish Exclusive economic Zone for Acanthochitona crinita (Pennant, 1777) 
Irish Exclusive economic Zone for Acanthochitona discrepans (T. Brown, 1827) 
Irish Exclusive economic Zone for Acanthochitona fascicularis (Linnaeus, 1767) 
Irish Exclusive economic Zone for Acanthodoris pilosa (Abildgaard, 1789) 
Irish Exclusive economic Zone for Acanthomysis longicornis (Milne Edwards, 1837) 
Irish Exclusive economic Zone for Acartia clausii Giesbrecht, 1889 
Irish Exclusive economic Zone for Achaeus cranchii Leach, 1817 
Irish Exclusive economic Zone for Achelia echinata Hodge, 1864 
Irish Exclusive economic Zone for Achelia hispida Hodge, 1864 
Irish Exclusive economic Zone for Achelia longipes (Hodge, 1864) 
Irish Exclusive economic Zone for Achelia simplex (Giltay, 1934) 
Irish Exclusive economic Zone for Achnanthes austriaca Hust., 1922 
Irish Exclusive economic Zone for Achnanthes oestrupii (Cleve-Euler) Hustedt, 1930 
Irish Exclusive economic Zone for Acholoe squamosa (Delle Chiaje, 1827) 
Irish Exclusive economic Zone for Acidostoma nodiferum Stephensen, 1923 
Irish Exclusive economic Zone for Acidostoma obesum (Spence Bate & Westwood, 1861) 
Irish Exclusive economic Zone for Acinetospora crinita (Carmichael) Sauvageau, 1899 
Irish Exclusive economic Zone for Aclis ascaris (W. Turton, 1819) 
Irish Exclusive economic Zone for Aclis gulsonae (W. Clark, 1850) 
Irish Exclusive economic Zone for Aclis minor (T. Brown, 1827) 
Irish Exclusive economic Zone for Acmaea virginea (O. F. Müller, 1776) 
Irish Exclusive economic Zone for Acrochaete heteroclada J.A.Correa & R.Nielsen, 1988 
Irish Exclusive economic Zone for Acrochaete operculata J.A.Correa & R.Nielsen, 1988 
Irish Exclusive economic Zone for Acrochaete repens Pringsheim, 1862 
Irish Exclusive economic Zone for Acrochaete viridis (Reinke) R.Nielsen, 1979 
Irish Exclusive economic Zone for Acrochaete wittrockii (Wille) R.Nielsen, 1983 
Irish Exclusive economic Zone for Acrochaetium alariae (Jónsson) Bornet, 1904 
Irish Exclusive economic Zone for Acrochaetium chylocladiae (Batters) Batters, 1902 
Irish Exclusive economic Zone for Acrochaetium endozoicum (Darbishire) Batters, 1902 
Irish Exclusive economic Zone for Acrochaetium minimum Collins, 1908 
Irish Exclusive economic Zone for Acrochaetium parvulum (Kylin) Hoyt, 1920 
Irish Exclusive economic Zone for Acrochaetium rosulatum (Rosenvinge) Papenfuss, 1945 
Irish Exclusive economic Zone for Acrochaetium savianum (Meneghini) Nägeli, 1862 
Irish Exclusive economic Zone for Acrochaetium seiriolanum (Gibson) Rosenvinge, 1924 
Irish Exclusive economic Zone for Acrochaetium sparsum (Harvey) Nägeli, 1862 
Irish Exclusive economic Zone for Acrochaetium virgatulum (Harvey) Batters, 1902 
Irish Exclusive economic Zone for Acrocnida brachiata (Montagu, 1804) 
Irish Exclusive economic Zone for Acrosiphonia arcta (Dillwyn) Gain, 1912 
Irish Exclusive economic Zone for Acrosorium venulosum (Zanardini) Kylin, 1924 
Irish Exclusive economic Zone for Acrothrix gracilis Kylin, 1907 
Irish Exclusive economic Zone for Acteon tornatilis (Linnaeus, 1758) 
Irish Exclusive economic Zone for Actinia equina (Linnaeus, 1758) 
Irish Exclusive economic Zone for Actinopyga agassizii (Selenka, 1867) 
Irish Exclusive economic Zone for Adalaria proxima (Alder & Hancock, 1854) 
Irish Exclusive economic Zone for Adyte pellucida (Ehlers, 1864) 
Irish Exclusive economic Zone for Aegires punctilucens (A. d'Orbigny, 1837) 
Irish Exclusive economic Zone for Aeolidia papillosa (Linnaeus, 1761) 
Irish Exclusive economic Zone for Aeolidiella alderi (Cocks, 1852) 
Irish Exclusive economic Zone for Aeolidiella glauca (Alder & Hancock, 1845) 
Irish Exclusive economic Zone for Aequipecten opercularis (Linnaeus, 1758) 
Irish Exclusive economic Zone for Aequorea forskalea Péron & Lesueur, 1810 
Irish Exclusive economic Zone for Aequorea pensilis (Haeckel, 1879) 
Irish Exclusive economic Zone for Aequorea vitrina Gosse, 1853 
Irish Exclusive economic Zone for Aetea anguina (Linnaeus, 1758) 
Irish Exclusive economic Zone for Aetea sica (Couch, 1844) 
Irish Exclusive economic Zone for Aetideopsis armata (Boeck, 1872) 
Irish Exclusive economic Zone for Aetideopsis multiserrata (Wolfenden, 1904) 
Irish Exclusive economic Zone for Aetideopsis rostrata Sars G.O., 1903 
Irish Exclusive economic Zone for Aglantha digitale (O. F. Müller, 1776) 
Irish Exclusive economic Zone for Aglaophamus agilis (Langerhans, 1880) 
Irish Exclusive economic Zone for Aglaophamus rubella (Michaelsen, 1897) 
Irish Exclusive economic Zone for Aglaophenia pluma (Linnaeus, 1758) 
Irish Exclusive economic Zone for Aglaophenia tubulifera (Hincks, 1861) 
Irish Exclusive economic Zone for Aglaothamnion bipinnatum (P.Crouan & H.Crouan) Feldmann & G.Feldmann, 1948 
Irish Exclusive economic Zone for Aglaothamnion diaphanum L'Hardy-Halos & Maggs, 1991 
Irish Exclusive economic Zone for Aglaothamnion gallicum (Nägeli) Halos ex Ardré, 1970 
Irish Exclusive economic Zone for Aglaothamnion hookeri (Dillwyn) Maggs & Hommersand, 1993 
Irish Exclusive economic Zone for Aglaothamnion priceanum Maggs, Guiry & Rueness, 1991 
Irish Exclusive economic Zone for Aglaothamnion roseum (Roth) Maggs & L'Hardy-Halos, 1993 
Irish Exclusive economic Zone for Aglaothamnion sepositum (Gunnerus) Maggs & Hommersand, 1993 
Irish Exclusive economic Zone for Aglaothamnion tenuissimum (Bonnemaison) Feldmann-Mazoyer, 1941 
Irish Exclusive economic Zone for Aglaothamnion tripinnatum (C.Agardh) Feldmann-Mazoyer, 1941 
Irish Exclusive economic Zone for Aglaozonia parvula (Greville) Zanardini, 1843 
Irish Exclusive economic Zone for Agmenellum quadruplicatum (Meneghini) Brébisson, 1839 
Irish Exclusive economic Zone for Agonus cataphractus (Linnaeus, 1758) 
Irish Exclusive economic Zone for Ahnfeltia plicata (Hudson) E.M.Fries, 1836 
Irish Exclusive economic Zone for Ahnfeltiopsis devoniensis (Greville) P.C.Silva & DeCew, 1992 
Irish Exclusive economic Zone for Akanthophoreus gracilis (Krøyer, 1842) 
Irish Exclusive economic Zone for Akera bullata O. F. Müller, 1776 
Irish Exclusive economic Zone for Alaria esculenta (Linnaeus) Greville, 1830 
Irish Exclusive economic Zone for Alca torda Linnaeus, 1758 
Irish Exclusive economic Zone for Alcyonidium gelatinosum (Linnaeus, 1761) 
Irish Exclusive economic Zone for Alcyonidium hirsutum (Fleming, 1828) 
Irish Exclusive economic Zone for Alcyonidium mytili Dalyell, 1848 
Irish Exclusive economic Zone for Alcyonidium parasiticum (Fleming, 1828) 
Irish Exclusive economic Zone for Alcyonium digitatum Linnaeus, 1758 
Irish Exclusive economic Zone for Alcyonium glomeratum (Hassall, 1843) 
Irish Exclusive economic Zone for Alcyonium hibernicum (Renouf, 1931) 
Irish Exclusive economic Zone for Alentia gelatinosa (M. Sars, 1835) 
Irish Exclusive economic Zone for Alle alle (Linnaeus, 1758)