Venericor abasolensis (FOSSIL) (Camacho & C. Fernández,1956 †)
Cyclocardia abesinaiensis (FOSSIL) Y. Otuka, 1940 †
Cardita abnormis (FOSSIL) É.A.A. Locard, 1889 †
Arcturellina abyssicola (R.B. Hinds, 1845)
Fasciculicardia acanthodes (FOSSIL) (H.H. Suter, 1917 †)
Pleuromeris acaris (FOSSIL) W.H. Dall, 1903 †
Centrocardita aculeata (G.S. Poli, 1795)
Centrocardita aculeata ronchettii (FOSSIL) (M. Glibert& van der Poel, 1970 †)
Venericardia acuticosta (FOSSIL) J.B.P.A. Lamarck, 1806 †
Carditamera affinis (G.B. I Sowerby, 1833)
Carditamera affinis californica (G.P. Deshayes, 1854)
Coripia agulhasensis (K.H.J. Thiele& S.G.A. Jaeckel, 1931)
Venericor agustoscrobis (FOSSIL) (Gardner & E. Bowles,1939 †)
Cardiocardita ajar (J.G. Bruguière, 1792)
Centrocardita akabana (R. Sturany, 1899)
Cyclocardia akagii (FOSSIL) K. Kanehara, 1937 †
Cardita alata (FOSSIL) R. Tate, 1886 †
Venericardia aliena (FOSSIL) G.P. Deshayes †
Fasciculicardia allophyla (FOSSIL) P.A. Maxwell, 1992 †
Claibornicardia alticostata (FOSSIL) (T.A. Conrad, 1833 †)
Glyptoactis alticostata (FOSSIL) (T.A. Conrad, 1833 †)
Purpurocardia amabilis (G.P. Deshayes, 1854)
Cyclocardia amaninensis (FOSSIL) L. Krishtofovich, 1947 †
Venericardia ameghinorum (FOSSIL) H.F.A. von Ihering,1907 †
Baluchicardia amplicrenata (FOSSIL) Heaslip, 1968 †
Cardita anadaraeformis (FOSSIL) A.E.M. Cossmann & G. Pissarro †,
Strophocardia anadyrensis (FOSSIL) A.M. Popov, 1983 †
Cardita analis R.A. Philippi, 1836
Miodontiscus annakensis (T. Oinomikado, 1939)
Cardites antiquatus (C. Linnaeus, 1758)
Cyclocardia aomoriensis (FOSSIL) K. Chinzei, 1968 †
Venericardia apodensata (FOSSIL) †
Venericor apodensata (FOSSIL) (Gardner & E. Bowles,1939 †)
Venericor aposmithii (FOSSIL) (Gardner & E. Bowles,1939 †)
Carditamera apotegea (FOSSIL) Gardner, 1926 †