Paradacna abichi (FOSSIL) Hornes † Russia
Agnocardia acrocome (FOSSIL) (W.H. Dall, 1900 †) Florida
Acanthocardia aculeata (C. Linnaeus, 1758) Spain, Almeria72 mm
Cardium acutangulum (FOSSIL) Phillips, 1829 † UK, England, North Yorkshire
Chesacardium acutilaqueatum (FOSSIL) (T.A. Conrad, 1839 †) USA, North Carolina, Duplin
Lyrocardium aeolicum (I. von Born, 1778) Cape Verde50 mm
Microcardium aequiliratum J. Poutiers, 1981 Philippines, Aliguay Island16 mm
Ciliatocardium ainuanum (FOSSIL) (Yokoyama, 1927 †)
Monodacna albida (B.M. Logvinenko& Y.I. Starobogatov, 1967) Caspian Sea
Protocardia alcesiana (FOSSIL) McLearn, 1933 † Canada, Alberta, Division No. 14
Trigoniocardia aliculum (FOSSIL) W.H. Dall, 1900 † Florida17 mm
Cardium altavillense (FOSSIL) A.E.M. Cossmann& G. Pissarro † France, Normandy6 mm
Agnocardia alternata (FOSSIL) (Hubbard, 1920 †)
Cardium altum E. Forbes, 1846
Iheringicardium ameghinoi (FOSSIL) (H.F.A. von Ihering,1907 †)
Trigoniocardia aminensis (FOSSIL) W.H. Dall, 1900 † Panama, Colón16 mm
Acrosterigma amirante E. Vidal, 1999 Madagascar
Lyrocardium anaxium P.G. Oliver& H.C.G. Chesney, 1997 Egypt, Sinai Peninsula71,9 mm
Nemocardium angelinae (FOSSIL) Garvie, 2013 † Texas, Rusk County19,2 mm
Vasticardium angulatum (J.B.P.A. Lamarck, 1819) Philippines, Calituban Island72,5 mm
Cardium angustatum (FOSSIL) J. de C. Sowerby, 1821 † Great Britain, Suffolk
Lophocardium annettae (W.H. Dall, 1889) Costa Rica50 mm
Trigoniocardia antillarum (A.V.M.D. D'Orbigny,1853) Panama, San Blas10,6 mm
Vepricardium antiquum (FOSSIL) (N.H. Ludbrook, 1978 †) West Australia, Northhampton
Pratulum antisemigranulatum (FOSSIL) (McCoy, 1877 †) Australia, Victoria, S. Grampians Bal
Fulvia aperta (J.G. Bruguière, 1789) New Caledonia38,6 mm
Discors aquitanicus (FOSSIL) C. Mayer, 1858 † France, Aquitaine39 mm
Pseudofulvia arago E. Vidal & L. Kirkendale,2007 Cook Islands, Arago bank
Keenocardium arakawae (FOSSIL) (Kamada 1962) †
Vasticardium arenicola (FOSSIL) (L.A. Reeve, 1845 †) Vanuatu Island, New Hebrides
Clinocardium asagaiense (FOSSIL) (J. Makiyama, 1934 †) Russia, Koryak, Olyutorskiy rayon
Vepricardium asiaticum (J.G. Bruguière, 1789) South China Sea41 mm
Papyridea aspersa (G.B. I Sowerby, 1833) West Panama65 mm
Vepricardium asperulum (FOSSIL) (J.B.P.A. Lamarck,1805 †) France, Paris Basin16 mm
Vasticardium assimile (L.A. Reeve, 1844) Tanzania48,5 mm