Aartsenia Warén, 1991 (additional source)
Aartsenia candida (Møller, 1842) (basis of record)
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)
Abralia J. E. Gray, 1849 (basis of record)
Abralia veranyi (Rüppell, 1844) (basis of record)
Abraliopsis pfefferi Joubin, 1896 accepted as Abraliopsis morisii (Vérany, 1839) (basis of record)
Acanthocardia J. E. Gray, 1851 (basis of record)
Acanthocardia aculeata (Linnaeus, 1758) (basis of record)
Acanthocardia deshayesii (Payraudeau, 1826) (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 attenuans Jeffreys, 1883 (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 trilineata R. B. Watson, 1897 (basis of record)
Aclis vitrea R. B. Watson, 1897 (basis of record)
Aclis walleri Jeffreys, 1867 (basis of record)
Acmaea Eschscholtz, 1833 (basis of record)
Acmaea virginea (O. F. Müller, 1776) accepted as Tectura virginea (O. F. Müller, 1776) (basis of record)
Acrilloscala lamyi (de Boury, 1909) (basis of record)
Acrochalix Bouchet & Warén, 1986 (basis of record)
Acrochalix callosa Bouchet & Warén, 1986 (basis of record)
Acteocina mucronata (R. A. Philippi, 1849) (basis of record)
Acteon Montfort, 1810 (basis of record)
Acteon monterosatoi Dautzenberg, 1889 (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 sadko Gorbunov, 1946 (basis of record)
Admete viridula (O. Fabricius, 1780) (basis of record)
Aegires leuckartii Vérany, 1853 (basis of record)
Aegires palensis Ortea, Luque & Templado, 1990 (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 rubra (Cantraine, 1835) (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)
Afrocardium Tomlin, 1931 (basis of record)
Afrocardium richardi (Audouin, 1826) (basis of record)
Aglaja tricolorata Renier, 1807 (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 conspicua (Monterosato, 1880) (basis of record)
Akritogyra curvilineata Warén, 1992 (basis of record)
Akritogyra helicella Warén, 1993 (basis of record)
Akritogyra similis (Jeffreys, 1883) (basis of record)
Alaba H. Adams & A. Adams, 1853 (basis of record)
Alderella Odhner, 1968 (basis of record)
Alderella comosa (A. Costa, 1867) (basis of record)
Alderia modesta (Lovén, 1844) (basis of record)
Aldisa banyulensis Pruvot-Fol, 1951 (basis of record)
Aldisa barlettai Ortea & Ballesteros, 1989 (basis of record)
Aldisa binotata Pruvot-Fol, 1953 (basis of record)
Aldisa zetlandica (Alder & Hancock, 1854) (basis of record)
Alexandromenia grimaldii Leloup, 1946 (basis of record)
Algarvia alba García-Gómez & Cervera, 1989 (basis of record)
Allogramma Dall, 1903 (basis of record)
Alloteuthis Wülker, 1920 (additional source)
Alora retifera Bouchet & Warén, 1986 (basis of record)
Alora tenerrima (Dautzenberg & H. Fischer, 1896) (basis of record)
Alvania Risso, 1826 (basis of record)
Alvania aartseni Verduin, 1986 (basis of record)
Alvania abstersa van der Linden & van Aartsen, 1994 (status source)
Alvania adiaphoros Bouchet & Warén, 1993 (basis of record)
Alvania adinogramma Bouchet & Warén, 1993 (basis of record)
Alvania aeoliae Palazzi, 1988 (basis of record)
Alvania algeriana (Monterosato, 1877) (basis of record)
Alvania amatii Oliverio, 1986 (basis of record)
Alvania angioyi van Aartsen, 1982 (basis of record)
Alvania angularis Warén, 1996 (basis of record)
Alvania aspera (R. A. Philippi, 1844) (basis of record)
Alvania aurantiaca (R. B. Watson, 1873) (basis of record)
Alvania beani [sic] accepted as Alvania beanii (Hanley, 1844) (basis of record)
Alvania canariensis (A. d'Orbigny, 1840) (basis of record)
Alvania cancapae Bouchet & Warén, 1993 (basis of record)
Alvania cancellata (da Costa, 1778) (basis of record)
Alvania carinata (da Costa, 1778) (basis of record)