Glyptoactis charanalensis (FOSSIL) A.A. Olsson, 1931 † Peru, Chira Valley
Megacardita chinensis F.S. Xu, 2012
Cyclocardia christiei (FOSSIL) J. Marwick, 1929 † New Zealand, South Island60 mm
Megacardita chukotica (FOSSIL) A.M. Popov, 1983 † Western Kamchatka
Tutcheria cingulata (FOSSIL) (G.A. Goldfuss, 1836 †) China, Guangdong, Jiangmen
Venericor claiboplata (FOSSIL) (Gardner & E. Bowles,1939 †) USA, Alabama, Monroe
Venericardia clarki (FOSSIL) C.S. Weaver & K.V.W. Palmer †, USA, Washington60 mm
Venericor clavidens (FOSSIL) (Grzybowski, 1899 †) Peru, Piura, Sullana
Venericor claviger (FOSSIL) (Gardner & E. Bowles,1936 †) USA, Alabama, Clarke
Venericardia columnaria (FOSSIL) C. Hedley & W.L. May,1908 † Tasmania
Cardita compacta (FOSSIL) R. Tate, 1886 †
Cardita complanata (FOSSIL) A.E.M. Cossmann& Pisarro, 1904 † France, Brittany
Venericardia complanata (FOSSIL) G.P. Deshayes, 1825 † France, Brittany36 mm
Cyclocardia compressa (L.A. Reeve, 1843) Argentina, Tierra del Fuego10,5 mm
Venericardia compressa (FOSSIL) L.A. Reeve, 1843 †
Cardita compta (FOSSIL) R. Tate, 1886 † Tasmania48 mm
Thecalia concamerata (J.G. Bruguière, 1792) South Africa, False Bay15 mm
Carditellopsis concinna (J.C. Melvill, 1918)
Arcturellina conferta (E.A. Smith, 1906)
Cyclocardia congelascens (J.C. Melvill& R. Standen, 1912)
Pleuromeris conradiana (FOSSIL) W.M. Gabb, 1881 † Costa Rica
Pleuromeris conradiana limonensis (FOSSIL) A.A. Olsson, 1922 † Costa Rica
Carditamera contigua (P. Dautzenberg, 1910)
Venericor cookei (FOSSIL) (Gardner & E. Bowles,1939 †) United States, Alabama, Covington
Cardites cooperi (J.C. Melvill, 1909)
Coripia corbis (R.A. Philippi, 1836) Italy, Cannizzaro4 mm
Megacardita coreensis (G.P. Deshayes, 1854) Japan, Fukuoka26 mm
Cardita costaeirregularis (FOSSIL) R.B. Newton, 1922 † Nigeria, Akwa Ibom, Ika
Cardita costaenodulosis (FOSSIL) R.B. Newton, 1922 † Nigeria, Akwa Ibom, Ika
Glans costairregularis (FOSSIL) R.B. Newton, 1922 † Nigeria15 mm
Cardita crassa (FOSSIL) J.B.P.A. Lamarck, 1819 † France, Aquitaine
Cardita crassicosta (J.B.P.A. Lamarck, 1819) Philippines, Zamboanga46 mm
Cardites crassicostatus (G.B. I Sowerby, 1825) Panama, Gobernadora Island50 mm
Cyclocardia crassidens (W.J. Broderip& G.B. I Sowerby, 1829) Alaska
Cyclocardia crebricostata A. Krause, 1885 Bering Sea16 mm