Plethobasus cooperianus (I. Lea, 1834)
Nephronaias copanensis (E.C. Von Martens, 1900)
Fusconaia cor (T.A. Conrad, 1834)
Parreysia corbis (S.C.T. Hanley, 1856)
Pleurobema cordatum C.S. Rafinesque, 1820
Lamprotula coreana E.C. Von Martens, 1905
Lamprotula cornuumlunae (P.M. Heude, 1883)
Lamellidens corrianus (I. Lea, 1834)
Parreysia corrugata (O.F. Müller, 1774)
Toxolasma corvunculus I. Lea, 1868
Lasmigona costata (C.S. Rafinesque, 1820)
Amphinaias couchiana (I. Lea, 1860)
Utterbackiana couperiana (I. Lea, 1840)
Actinonaias coyensis (H.A. Pilsbry, 1910)
Lamprotula crassa (W. Wood, 1815)
Elliptio crassidens J.B.P.A. Lamarck, 1819
Pseudodon crassus H. Drouët & M.A. Chaper,1892
Unio crassus L. Philipsson in A. Retzius,1788
Unio crassus nanus (J.B.P.A. Lamarck, 1810)
Pseudodon crebristriatus J.G. Anthony, 1865
Coelatura cridlandi G. Mandahl-Barth, 1954
Scabies crispata (A.A. Gould, 1843)
Radiatula crispisulcata (W.H. Benson, 1862)
Psoronaias crocodilorum (P.M.A. Morelet, 1849)
Unio cumberlandi (FOSSIL) F.W. Woodward, 1965 †
Pseudodon cumingii (I. Lea, 1850)
Hyriopsis cumingii (I. Lea, 1834)
Fusconaia cuneolus (I. Lea, 1840)
Pleurobema curtum I. Lea, 1859
Anodonta cygnea (C. Linnaeus, 1758)
Anodonta cygnea cellensis (J.F. Gmelin, 1791)
Elliptio cylindracea L.S. Frierson, 1927
Toxolasma cylindrellus I. Lea, 1868
Parreysia cylindrica T.N. Annandale & B. Prashad,1919
Theliderma cylindrica (T. Say, 1817)