Venericor abasolensis (FOSSIL) (Camacho& C. Fernández, 1956 †) Argentina, Chubut, Sarmiento
Cyclocardia abesinaiensis (FOSSIL) Y. Otuka, 1940 † Japan, Hokkaido
Cardita abnormis (FOSSIL) É.A.A. Locard, 1889 † Tunisia
Arcturellina abyssicola (R.B. Hinds, 1845) Philippines, Bohol Island27 mm
Fasciculicardia acanthodes (FOSSIL) (H.H. Suter, 1917 †) New Zealand, Canterbury, Waimate
Pleuromeris acaris (FOSSIL) W.H. Dall, 1903 † Dominican Republic
Centrocardita aculeata (G.S. Poli, 1795) Portugal22 mm
Centrocardita aculeata ronchettii (FOSSIL) (M. Glibert& van der Poel, 1970 †) Netherlands
Venericardia acuticosta (FOSSIL) J.B.P.A. Lamarck, 1806 † France, Paris Basin40 mm
Carditamera affinis (G.B. I Sowerby, 1833) Costa Rica42,8 mm
Carditamera affinis californica (G.P. Deshayes, 1854) Mexico, Sonora70,1 mm
Coripia agulhasensis (K.H.J. Thiele& S.G.A. Jaeckel, 1931)
Venericor agustoscrobis (FOSSIL) (Gardner & E. Bowles,1939 †)
Cardiocardita ajar (J.G. Bruguière, 1792) Liberia29 mm
Centrocardita akabana (R. Sturany, 1899) Turkey, Iskenderun gulf15,29 mm
Cyclocardia akagii (FOSSIL) K. Kanehara, 1937 † Russia, Kamchatka, Olyutorskiy rayon
Cardita alata (FOSSIL) R. Tate, 1886 † Australia, South Australia, Adelaide
Venericardia aliena (FOSSIL) G.P. Deshayes † Ukraine
Fasciculicardia allophyla (FOSSIL) P.A. Maxwell, 1992 † New Zealand, Canterbury, Waimate
Claibornicardia alticostata (FOSSIL) (T.A. Conrad, 1833 †) Trinidad and Tobago
Glyptoactis alticostata (FOSSIL) (T.A. Conrad, 1833 †) Texas
Purpurocardia amabilis (G.P. Deshayes, 1854) Australia, Smoky bay15 mm
Cyclocardia amaninensis (FOSSIL) L. Krishtofovich, 1947 † Western Kamchatka
Venericardia ameghinorum (FOSSIL) H.F.A. von Ihering,1907 † Argentina, La Pampa, Puelén
Baluchicardia amplicrenata (FOSSIL) Heaslip, 1968 †
Cardita anadaraeformis (FOSSIL) A.E.M. Cossmann& G. Pissarro † France, Normandy6 mm
Strophocardia anadyrensis (FOSSIL) A.M. Popov, 1983 † Russia, Anadyrski Bay
Cardita analis R.A. Philippi, 1836
Miodontiscus annakensis (T. Oinomikado, 1939) Russia, Sakhalin
Cardites antiquatus (C. Linnaeus, 1758) Spain, Almeria29 mm
Cyclocardia aomoriensis (FOSSIL) K. Chinzei, 1968 † Japan, Kitakami massif
Venericardia apodensata (FOSSIL) † USA, Alabama, Choctaw
Venericor apodensata (FOSSIL) (Gardner & E. Bowles,1939 †) USA, Mississippi, Hinds
Venericor aposmithii (FOSSIL) (Gardner & E. Bowles,1939 †) USA, Alabama, Dale
Carditamera apotegea (FOSSIL) Gardner, 1926 † Florida55 mm