Abra Lamarck, 1818 (basis of record)
Abra alba (W. Wood, 1802) (basis of record)
Abra longicallus (Scacchi, 1835) (basis of record)
Abra nitida (O. F. Müller, 1776) (basis of record)
Abra prismatica (Montagu, 1808) (basis of record)
Abra profundorum (E. A. Smith, 1885) (basis of record)
Abra segmentum (Récluz, 1843) (basis of record)
Abra tenuis (Montagu, 1803) (basis of record)
Acanthocardia J. E. Gray, 1851 (basis of record)
Acanthocardia aculeata (Linnaeus, 1758) (basis of record)
Acanthocardia echinata (Linnaeus, 1758) (basis of record)
Acanthocardia paucicostata (G. B. Sowerby II, 1834) (basis of record)
Acanthocardia spinosa ([Lightfoot], 1786) (basis of record)
Acanthochitona crinita (Pennant, 1777) (basis of record)
Acanthochitona discrepans (T. Brown, 1827) (basis of record)
Acanthochitona fascicularis (Linnaeus, 1767) (basis of record)
Acirsa coarctata (Jeffreys, 1884) (basis of record)
Acirsa subdecussata (Cantraine, 1835) (basis of record)
Aclis ascaris (W. Turton, 1819) (basis of record)
Aclis gulsonae (W. Clark, 1850) (basis of record)
Aclis minor (T. Brown, 1827) (basis of record)
Aclis sarsi Dautzenberg & H. Fischer, 1912 (basis of record)
Aclis walleri Jeffreys, 1867 (basis of record)
Acmaea Eschscholtz, 1833 (basis of record)
Acrilloscala lamyi (de Boury, 1909) (basis of record)
Acteon Montfort, 1810 (basis of record)
Acteon tornatilis (Linnaeus, 1758) (basis of record)
Adalaria loveni (Alder & Hancock, 1862) (basis of record)
Adalaria proxima (Alder & Hancock, 1854) (basis of record)
Addisonia excentrica (Tiberi, 1855) (basis of record)
Adeuomphalus ammoniformis G. Seguenza, 1876 (basis of record)
Admete Møller, 1842 (basis of record)
Admete viridula (O. Fabricius, 1780) (basis of record)
Aegires punctilucens (A. d'Orbigny, 1837) (basis of record)
Aeolidiella Bergh, 1867 (basis of record)
Aeolidiella alderi (Cocks, 1852) (basis of record)
Aeolidiella glauca (Alder & Hancock, 1845) (basis of record)
Aeolidiella sanguinea (Norman, 1877) (basis of record)
Aequipecten P. Fischer, 1886 (basis of record)
Aequipecten commutatus (Monterosato, 1875) (basis of record)
Aequipecten opercularis (Linnaeus, 1758) (basis of record)
Akera O. F. Müller, 1776 (basis of record)
Akera bullata O. F. Müller, 1776 (basis of record)
Akritogyra Warén, 1992 (basis of record)
Akritogyra helicella Warén, 1993 (basis of record)
Alderia modesta (Lovén, 1844) (basis of record)
Aldisa zetlandica (Alder & Hancock, 1854) (basis of record)
Allogramma Dall, 1903 (basis of record)
Alloteuthis Wülker, 1920 (additional source)
Alvania Risso, 1826 (basis of record)
Alvania cancellata (da Costa, 1778) (basis of record)
Alvania carinata (da Costa, 1778) (basis of record)
Alvania cimicoides (Forbes, 1844) (basis of record)
Alvania electa (Monterosato, 1874) (basis of record)
Alvania hispidula (Monterosato, 1884) (basis of record)
Alvania jeffreysi (E. Waller, 1864) (basis of record)
Alvania lactea (Michaud, 1830) (basis of record)
Alvania parvula (Jeffreys, 1884) (basis of record)
Alvania porcupinae Gofas & Warén, 1982 (basis of record)
Alvania pseudosyngenes Warén, 1973 (basis of record)
Alvania punctura (Montagu, 1803) (basis of record)
Alvania rudis (R. A. Philippi, 1844) (basis of record)
Alvania subsoluta (Aradas, 1847) (basis of record)
Alvania testae (Aradas & Maggiore, 1844) (basis of record)
Alvania tomentosa (Pallary, 1920) (basis of record)
Alvania wyvillethomsoni (Friele, 1877) accepted as Punctulum wyvillethomsoni (Friele, 1877) (basis of record)
Alvania zetlandica (Montagu, 1816) (basis of record)
Amauropsis Mörch, 1857 (basis of record)
Amauropsis brassiculina (Locard, 1897) (basis of record)
Amauropsis islandica (Gmelin, 1791) (basis of record)
Amauropsis sphaeroides (Jeffreys, 1877) (basis of record)
Ammonicera rota (Forbes & Hanley, 1850) (basis of record)
Amphissa H. Adams & A. Adams, 1853 (basis of record)
Amphissa acutecostata (R. A. Philippi, 1844) (basis of record)
Amygdalum Megerle von Mühlfeld, 1811 (basis of record)
Anachis aliceae (Pallary, 1900) (basis of record)
Anadara J. E. Gray, 1847 (basis of record)
Anamenia Nierstrasz, 1908 (basis of record)
Anamenia borealis (Koren & Danielssen, 1877) (basis of record)
Anatoma umbilicata (Jeffreys, 1883) (basis of record)
Ancistrobasis reticulata (R. A. Philippi, 1844) (basis of record)
Ancistrosyrinx clytotropis (Sykes, 1906) (basis of record)
Ancula Lovén, 1846 (basis of record)
Ancula gibbosa (Risso, 1818) (basis of record)
Anekes Bouchet & Warén, 1979 (basis of record)
Anekes affinis (Jeffreys, 1883) (basis of record)
Anekes paucistriata Warén, 1992 (basis of record)
Anekes sculpturata Warén, 1992 (basis of record)
Anekes undulisculpta Bouchet & Warén, 1979 (basis of record)
Anidolyta Willan, 1987 accepted as Tylodina Rafinesque, 1814 (basis of record)
Anomia Linnaeus, 1758 (basis of record)
Anomia ephippium Linnaeus, 1758 (basis of record)
Ansates pellucida (Linnaeus, 1758) accepted as Patella pellucida Linnaeus, 1758 (basis of record)
Antemnella Rankin, 1979 accepted as Asperspina Rankin, 1979 (basis of record)
Antemnella loricata (Swedmark, 1968) accepted as Asperspina loricata (Swedmark, 1968) (basis of record)
Aplysia Linnaeus, 1767 (basis of record)
Aplysia fasciata Poiret, 1789 (basis of record)
Aplysia punctata (Cuvier, 1803) (basis of record)
Aporrhais da Costa, 1778 (basis of record)
Aporrhais pespelecani (Linnaeus, 1758) (basis of record)