Venericor aragonia (FOSSIL) (R. Arnold& H.B. Hannibal, 1914 †)
Carditamera arata (T.A. Conrad, 1838)
Trapezicardita arcadiformis (FOSSIL) (Keeping, 1883 †)
Glans arcaeformis (FOSSIL) (A.C. Chapman& I. Crespin, 1934 †)
Pleuromeris archaenepeanenesis (FOSSIL) A.C. Chapman & I. Crespin,1928 †
Cardita arduini (FOSSIL) A. Brongniart, 1823 †
Pleuromeris armilla (W.H. Dall, 1903)
Venericor ascia (FOSSIL) (B. Rogers, 1839 †)
Carditamera aspera (FOSSIL) (J.B.P.A. Lamarck,1805 †)
Arcturellina asperula (FOSSIL) (G.P. Deshayes, 1825 †)
Cyclocardia astartoides (E.C. Von Martens, 1878)
Miodomeris astartoides (FOSSIL) (G.P. Deshayes, 1858 †)
Pleuromeris auroraensis (FOSSIL) Ward & B.W. Blackwelder,1987 †
Cardita austriaca (FOSSIL) J. Von Hauer, 1853 †
Venericor austroplata (FOSSIL) (Gardner & E. Bowles,1939 †)
Glyptoactis aversa (FOSSIL) (H.A. Pilsbry & Johnson,1917 †)
Cardita aviculina J.B.P.A. Lamarck, 1819
Cardita aviculina excavata G.P. Deshayes, 1854
Cyclocardia awamoensis (FOSSIL) (G.F. Harris, 1897 †)
Cyclocardia bailyi (J.Q. Burch, 1944)
Carditamera bajaensis González & G. Giribet,2012
Cyclocardia barbarensis R.E.C. Stearns, 1890
Venericor barroneti (FOSSIL) (Munier-Chalmas 1881) †
Fasciculicardia bartrumi (FOSSIL) (Fleming, 1950 †)
Venericor bashiplata (FOSSIL) (Gardner & E. Bowles,1939 †)
Purpurocardia beata (FOSSIL) (J. Marwick, 1928 †)
Cyclocardia beebei (L.G. Hertlein, 1958)
Centrocardita belcheri (G.P. Deshayes, 1854)
Carditellopsis bellisima (FOSSIL) Darragh 1994 †
Cyclocardia belogolovensis (FOSSIL) (Ilyina, 1962 †)
Cardita belviderensis (FOSSIL) Cragin, 1894 †
Fasciculicardia benhami (FOSSIL) (Thompson, 1908 †)
Pleuromeris benthicola A.W.B. Powell, 1937
Cyclocardia beringiana (FOSSIL) (Slodkewitsch, 1936 †)
Cardita berjadinensis (FOSSIL) F. Hodson, 1927 †