Ciliatocardium carlsbergianum (FOSSIL) A.I. Kafanov, 2002 †
Acanthocardia carolimartini (FOSSIL) C. Beets, 1985 †
Trigoniocardia carolinae (FOSSIL) C.J. Maury, 1912 †
Granocardium carolinum (FOSSIL) (A.V.M.D. D'Orbigny,1843 †)
Trachycardium carpati (M. Nicklés, 1955)
Parvicardium carrozzai J.J. Van Aartsen & J. Goud,2001
Nemocardium carteri (FOSSIL) P.A. Maxwell, 1992 †
Monodacna caspia (K.E.I. von Eichwald,1829)
Laevicardium castanea E. Vidal, 2005
Pratulum catinus (FOSSIL) (P.A. Maxwell, 1992 †)
Neodidacnomya caucasica (FOSSIL) (Andrussov, 1923 †)
Dinocardium cedrelarum (FOSSIL) (L.R. Cox, 1941 †)
Keenaea centifilosum (Carpenter, 1864)
Frigidocardium centumliratum (J.C. Melvill, 1907)
Phlogocardia cestum (FOSSIL) (W.H. Dall, 1903 †)
Keenocardium chejsliensis (FOSSIL) (V.N. Sinelnikova,1990 †)
Acanthocardia cheribonense (FOSSIL) C.H. Oostingh, 1935 †
Cerastoderma chipolanum (FOSSIL) W.H. Dall, 1900 †
Cerastoderma chipolanum alumen (FOSSIL) J. Gardner, 1928 †
Ciliatocardium ciliatum (O. Fabricius, 1780)
Agnocardia cinderellae (FOSSIL) (C.J. Maury, 1917 †)
Cardium citrinoideum (FOSSIL) B. Phillips, 1829 †
Agnocardia claibornense (FOSSIL) (T.H. Aldrich, 1911 †)
Laevicardium clarionense (L.G. Hertlein& A.M. Strong, 1947)
Cardium cloacinum (FOSSIL) F.A. von Quenstedt,1856 †
Cardium cognatum (FOSSIL) Phillips, 1829 †
Cardium coislinense (FOSSIL) A.E.M. Cossmann, 1905 †
Hedecardium collinsi (FOSSIL) J. Marwick, 1960 †
Fulvia colorata E. Vidal & L. Kirkendale,2007
Monodacna colorata (K.E.I. von Eichwald,1829)
Monodacna colorata acuticostata B.M. Logvinenko& Y.I. Starobogatov
Americardia columba (A. Heilprin, 1886)
Americardia columbella Y.C. Lee & M. Huber, 2012
Laevicardium compressum (FOSSIL) W.H. Dall, 1900 †
Vasticardium compunctum T. Kira, 1959