• Abditoconus anselli (Harvey, 1996)
• Abditoconus brava (Romano, Pérez-Portela & D. Martin, 2014)
• Abra alba (W. Wood, 1802)
• Abra americana A. E. Verrill & K. J. Bush, 1898
• Abra fragilis Risso, 1826 accepted as Abra prismatica (Montagu, 1808)
• Abra lioica (Dall, 1881)
• Abra longicallus (Scacchi, 1835)
• Abra longicallus americana A. E. Verrill & K. J. Bush, 1898 accepted as Abra americana A. E. Verrill & K. J. Bush, 1898
• Abra milashevichi Nevesskaja, 1963 accepted as Abra prismatica (Montagu, 1808)
• Abra nitida (O. F. Müller, 1776)
• Abra ovata (R. A. Philippi, 1836) accepted as Abra segmentum (Récluz, 1843)
• Abra prismatica (Montagu, 1808)
• Abra profundorum (E. A. Smith, 1885)
• Abra renieri (Bronn, 1831) accepted as Abra alba (W. Wood, 1802)
• Abra segmentina H. Adams & A. Adams, 1856 accepted as Abra segmentum (Récluz, 1843)
• Abra segmentum (Récluz, 1843)
• Abra seychellarum (A. Adams, 1856) accepted as Iacra seychellarum (A. Adams, 1856)
• Abra tenuis (Montagu, 1803)
• Abra tenuis lorenzoi Cecalupo, Buzzurro & Mariani, 2008 accepted as Abra segmentum (Récluz, 1843)
• Acanthocardia (Rudicardium) tuberculata (Linnaeus, 1758) accepted as Acanthocardia tuberculata (Linnaeus, 1758)
• Acanthocardia aculeata (Linnaeus, 1758)
• Acanthocardia deshayesii (Payraudeau, 1826)
• Acanthocardia echinata (Linnaeus, 1758)
• Acanthocardia mucronata (Poli, 1791) accepted as Acanthocardia echinata (Linnaeus, 1758)
• Acanthocardia paucicostata (G. B. Sowerby II, 1834)
• Acanthocardia spinosa ([Lightfoot], 1786)
• Acanthocardia tuberculata (Linnaeus, 1758)
• Adacna laeviuscula (Eichwald, 1829)
• Adacna vitrea (Eichwald, 1829)
• Adasius loscombeus Leach, 1852 accepted as Solecurtus scopula (W. Turton, 1822)
• Adontorhina keegani Barry & McCormack, 2007
• Adontorhina similis Barry & McCormack, 2007
• Adontorhina transversa (Payne & J. A. Allen, 1991)
• Afrocardium richardi (Audouin, 1826)
• Afrolucina lens (A. E. Verrill & S. Smith, 1880)
• Agriopoma morrhuanum (Dall, 1902)
• Aligena elevata (W. Stimpson, 1851) accepted as Kelliopsis elevata (W. Stimpson, 1851)
• Allogramma formosa (Jeffreys, 1882)
• Altenaeum dawsoni (Jeffreys, 1864)
• Altenaeum nortoni Spaink, 1972 † accepted as Altenaeum dawsoni (Jeffreys, 1864)
• Alveinus miliaceus (Issel, 1869)
• Ameritella agilis (W. Stimpson, 1858)
• Ameritella mitchelli (Dall, 1895)
• Ameritella tenella (A. E. Verrill, 1874)
• Ameritella versicolor (De Kay, 1843)
• Amphidesma corbuloides Lamarck, 1818 accepted as Lyonsia norwegica (Gmelin, 1791)
• Amphidesma donacilla Lamarck, 1818 accepted as Donacilla cornea (Poli, 1791)
• Amphidesma intermedia W. Thompson, 1845 accepted as Abra nitida (O. F. Müller, 1776)
• Amphidesma lucinale Lamarck, 1818 accepted as Loripes orbiculatus Poli, 1795
• Amphidesma nucleolata Lamarck, 1818 accepted as Abra tenuis (Montagu, 1803)
• Amphidesma phaseolina Lamarck, 1818 accepted as Thracia phaseolina (Lamarck, 1818)
• Amphidesma siculum G. B. Sowerby I, 1833 accepted as Scrobicularia cottardii (Payraudeau, 1826)
• Anatina bonfornellensis De Gregorio, 1885 accepted as Thracia distorta (Montagu, 1803) accepted as Ixartia distorta (Montagu, 1803)
• Anatina brevirostris T. Brown, 1829 accepted as Cuspidaria cuspidata (Olivi, 1792)
• Anatina elongata Hanley, 1842 accepted as Lyonsia norwegica (Gmelin, 1791)
• Anatina longirostris Lamarck, 1818 accepted as Cuspidaria rostrata (Spengler, 1793)
• Anatina myalis Lamarck, 1818 accepted as Thracia pubescens (Pulteney, 1799)
• Anatina oblonga R. A. Philippi, 1836 accepted as Cochlodesma praetenue (Pulteney, 1799)
• Anatina ovalis T. Brown, 1827 accepted as Thracia villosiuscula (MacGillivray, 1827)
• Anatina radiata Calcara, 1840 accepted as Cardiomya costellata (Deshayes, 1835)
• Anatina rupicola Lamarck, 1818 accepted as Thracia distorta (Montagu, 1803) accepted as Ixartia distorta (Montagu, 1803)
• Anatina subrostrata Lamarck, 1818 accepted as Laternula anatina (Linnaeus, 1758)
• Anatina truncata Lamarck, 1818 accepted as Cochlodesma praetenue (Pulteney, 1799)
• Anatina truncata W. Turton, 1822 accepted as Thracia distorta (Montagu, 1803) accepted as Ixartia distorta (Montagu, 1803)
• Anatina villosiuscula MacGillivray, 1827 accepted as Thracia villosiuscula (MacGillivray, 1827)
• Anchomasa pennantiana Leach, 1852 accepted as Barnea parva (Pennant, 1777)
• Angulus agilis (W. Stimpson, 1858) accepted as Ameritella agilis (W. Stimpson, 1858)
• Angulus donacinus (Linnaeus, 1758) accepted as Moerella donacina (Linnaeus, 1758)
• Angulus fabula (Gmelin, 1791) accepted as Fabulina fabula (Gmelin, 1791)
• Angulus incarnatus (Linnaeus, 1758) accepted as Bosemprella incarnata (Linnaeus, 1758)
• Angulus planatus (Linnaeus, 1758) accepted as Peronaea planata (Linnaeus, 1758)
• Angulus pygmaeus (Lovén, 1846) accepted as Asbjornsenia pygmaea (Lovén, 1846)
• Angulus squalidus (Pulteney, 1799) accepted as Tellina incarnata Linnaeus, 1758 accepted as Bosemprella incarnata (Linnaeus, 1758)
• Angulus tenellus A. E. Verrill, 1874 accepted as Ameritella tenella (A. E. Verrill, 1874)
• Angulus tenuis (da Costa, 1778) accepted as Macomangulus tenuis (da Costa, 1778)
• Angulus versicolor (De Kay, 1843) accepted as Ameritella versicolor (De Kay, 1843)
• Anodonta anatina (Linnaeus, 1758)
• Anodonta cygnea (Linnaeus, 1758)
• Anodonta piscinalis Nilsson, 1823 accepted as Anodonta anatina (Linnaeus, 1758)
• Anodontia (Loripinus) fragilis (R. A. Philippi, 1836) accepted as Loripinus fragilis (R. A. Philippi, 1836)
• Antigona lamellaris Schumacher, 1817
• Aphrodite columba I. Lea, 1834 accepted as Cardium groenlandicum Mohr, 1786 accepted as Serripes groenlandicus (Mohr, 1786)
• Arcinella laevis R. A. Philippi, 1844 accepted as Kurtiella bidentata (Montagu, 1803)
• Arcopagia balaustina (Linnaeus, 1758) accepted as Arcopella balaustina (Linnaeus, 1758)
• Arcopagia britannica (Tomlin, 1934) accepted as Arcopella balaustina (Linnaeus, 1758)
• Arcopagia britannica purpurmaculata F. Nordsieck, 1969 accepted as Arcopella balaustina (Linnaeus, 1758)
• Arcopagia crassa (Pennant, 1777)
• Arcopella balaustina (Linnaeus, 1758)
• Arctica islandica (Linnaeus, 1767)
• Arctica vulgaris Schumacher, 1817 accepted as Arctica islandica (Linnaeus, 1767)
• Arctoe fulva Risso, 1826 accepted as Dosinia exoleta (Linnaeus, 1758)
• Arctoe lineolata Risso, 1826 accepted as Loripes orbiculatus Poli, 1795
• Arctoe nitidissima Risso, 1826 accepted as Dosinia lupinus (Linnaeus, 1758)
• Arctoe parkinsonia Risso, 1826 accepted as Dosinia lupinus (Linnaeus, 1758)
• Arculus sykesii (Chaster, 1895)
• Arthemis compta [sic] accepted as Dosinia lupinus (Linnaeus, 1758)
• Asbjornsenia pygmaea (Lovén, 1846)
• Asbjornsenia striata Friele, 1886 accepted as Asbjornsenia pygmaea (Lovén, 1846)
• Astarte acuticostata Friele, 1877 accepted as Tridonta acuticostata (Friele, 1877)
• Astarte affinis Cantraine, 1835 accepted as Laevastarte fusca fusca (Poli, 1795)