Alopias vulpinus (Bonnaterre, 1788)
Alosa alosa (Linnaeus, 1758)
Alosa fallax (Lacepède, 1803)
Alvania cancellata (da Costa, 1778)
Amathia lendigera (Linnaeus, 1758)
Ammothella longipes (Hodge, 1864)
Amphibalanus amphitrite Darwin, 1854
Amphilochus neapolitanus Della Valle, 1893
Amphipholis squamata (Delle Chiaje, 1828)
Amphiprion bicinctus Rüppell, 1830
Amphisbetia operculata (Linnaeus, 1758)
Amphiura mediterranea Lyman, 1882
Ampithoe gammaroides (Bate, 1856)
Ampithoe ramondi Audouin 1826
Ampithoe rubricata (Montagu, 1808)
Ampulla priamus (Gmelin, 1791)
Anapagurus laevis (Bell, 1845)
Anemonactis mazeli (Jourdan, 1880)
Anemonia melanaster (Verrill, 1901)
Anemonia sulcata (Pennant, 1777)
Anguilla anguilla (Linnaeus, 1758)
Anilocra physodes (Linnaeus, 1758)
Anomia ephippium Linnaeus, 1758
Anoplodactylus virescens (Hodge, 1864)
Antalis entalis (Linnaeus, 1758)
Antedon bifida (Pennant, 1777)
Antennarius nummifer (Cuvier, 1817)
Anthias anthias (Linnaeus, 1758)
Anthopleura ballii (Cocks, 1851)
Anthopleura biscayensis (Fischer, 1874)
Anthura gracilis (Montagu, 1808)
Antipathella wollastoni (Gray, 1857)
Aora typica Krøyer, 1845
Aphanopus carbo Lowe, 1839
Apherusa bispinosa (Bate, 1857)
Apherusa jurinei (Milne-Edwards, 1830)
Aphrodita aculeata (Linnaeus, 1758)
Aplidium elegans (Giard, 1872)
Aplidium multiplicatum Sluiter, 1909
Aplidium proliferum (Milne-Edwards, 1841)