Glyptoactis charanalensis (FOSSIL) A.A. Olsson, 1931 †
Megacardita chinensis F.S. Xu, 2012
Cyclocardia christiei (FOSSIL) J. Marwick, 1929 †
Megacardita chukotica (FOSSIL) A.M. Popov, 1983 †
Tutcheria cingulata (FOSSIL) (G.A. Goldfuss, 1836 †)
Venericor claiboplata (FOSSIL) (Gardner & E. Bowles,1939 †)
Venericardia clarki (FOSSIL) C.S. Weaver & K.V.W. Palmer †,
Venericor clavidens (FOSSIL) (Grzybowski, 1899 †)
Venericor claviger (FOSSIL) (Gardner & E. Bowles,1936 †)
Venericardia columnaria (FOSSIL) C. Hedley & W.L. May,1908 †
Cardita compacta (FOSSIL) R. Tate, 1886 †
Cardita complanata (FOSSIL) A.E.M. Cossmann & Pisarro,1904 †
Venericardia complanata (FOSSIL) G.P. Deshayes, 1825 †
Cyclocardia compressa (L.A. Reeve, 1843)
Venericardia compressa (FOSSIL) L.A. Reeve, 1843 †
Cardita compta (FOSSIL) R. Tate, 1886 †
Thecalia concamerata (J.G. Bruguière, 1792)
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 †
Pleuromeris conradiana limonensis (FOSSIL) A.A. Olsson, 1922 †
Carditamera contigua (P. Dautzenberg, 1910)
Venericor cookei (FOSSIL) (Gardner & E. Bowles,1939 †)
Cardites cooperi (J.C. Melvill, 1909)
Coripia corbis (R.A. Philippi, 1836)
Megacardita coreensis (G.P. Deshayes, 1854)
Cardita costaeirregularis (FOSSIL) R.B. Newton, 1922 †
Cardita costaenodulosis (FOSSIL) R.B. Newton, 1922 †
Glans costairregularis (FOSSIL) R.B. Newton, 1922 †
Cardita crassa (FOSSIL) J.B.P.A. Lamarck, 1819 †
Cardita crassicosta (J.B.P.A. Lamarck, 1819)
Cardites crassicostatus (G.B. I Sowerby, 1825)
Cyclocardia crassidens (W.J. Broderip& G.B. I Sowerby, 1829)
Cyclocardia crebricostata A. Krause, 1885