Apolymetis coarctata (R.A. Philippi, 1845)
Tellina coccinea G.B. Sowerby, 1869
Tellina cockburnensis G.W. Kendrick & A. Brearley,1984
Leporimetis cognata (H.A. Pilsbry& E.G. Vanatta, 1902)
Temnoconcha cognata (Adams, 1852)
Tellina coislinensis (FOSSIL) A.E.M. Cossmann, 1906 †
Tellina collustrata (FOSSIL) G.P. Deshayes, 1857 †
Moerella colomnbiana (FOSSIL) Clark & J.W. Durham,1946 †
Tellina colorata W.H. Dall, 1900
Tellina colpodes (FOSSIL) J.F. Bayan, 1873 †
Cadella coltroi M. Huber, A. Langleit& K. Kreipl, 2015
Psammotreta columbiensis (S.C.T. Hanley, 1844)
Tellina compacta E.A. Smith, 1885
Tellina compressa (G.B. Brocchi, 1814)
Tellina compressissima G.B. II Sowerby, 1869
Confusella confusa (H.B. Preston, 1914)
Tellina consanguinea G.B. Sowerby, 1903
Tellina consobrina (A.V.M.D. D'Orbigny,1853)
Macoma consociata (E.A. Smith, 1885)
Tellina conspicua S.C.T. Hanley, 1846
Macoma constricta (J.G. Bruguière, 1792)
Macoma contabulata (G.P. Deshayes, 1855)
Macoma cookei (FOSSIL) Gardner, 1943 †
Arcopagiopsis corbinoides (FOSSIL) (Caillat, 1835 †)
Tellinangulus corbuloides T.A. Okutani, 2006
Tellina corbuloides S.C.T. Hanley, 1844
Tellina cornea G.S. Poli, 1795
Arcopagia corneola (FOSSIL) (J.B.P.A. Lamarck,1806 †)
Oudardia coseli M. Huber, A. Langleit& K. Kreipl, 2015
Macoma costaricana (FOSSIL) A.A. Olsson, 1922 †
Macoma cotteri F.E. Eames, 1950
Tellina couvaensis (FOSSIL) E.H. Vokes, 1938 †
Arcopagia crassa (T. Pennant, 1777)
Arcopagia crassa reducta (FOSSIL) G.F. Dollfus& P. Dautzenberg, 1886 †
Barytellina crassidens (FOSSIL) J. Marwick, 1924 †