Plethobasus cooperianus (I. Lea, 1834) Pennsylvania
Nephronaias copanensis (E.C. Von Martens, 1900) Guatemala
Fusconaia cor (T.A. Conrad, 1834) Alabama, Florence
Parreysia corbis (S.C.T. Hanley, 1856) India, Assam
Pleurobema cordatum C.S. Rafinesque, 1820 Alabama67 mm
Lamprotula coreana E.C. Von Martens, 1905 Korea, Seul
Lamprotula cornuumlunae (P.M. Heude, 1883) Poyang Lake, Jiangxi, China95 mm
Lamellidens corrianus (I. Lea, 1834) Kashmir
Parreysia corrugata (O.F. Müller, 1774) India, Sina River
Toxolasma corvunculus I. Lea, 1868 Pennsylvania, Swamp Creek
Lasmigona costata (C.S. Rafinesque, 1820) Alabama91,9 mm
Amphinaias couchiana (I. Lea, 1860) Mexico, Colima
Utterbackiana couperiana (I. Lea, 1840) Florida
Actinonaias coyensis (H.A. Pilsbry, 1910) Mexico, San Luis Potosì
Lamprotula crassa (W. Wood, 1815) Vietnam, Cao Bang
Elliptio crassidens J.B.P.A. Lamarck, 1819 Florida83,1 mm
Pseudodon crassus H. Drouët & M.A. Chaper,1892 Malaysia, Borneo
Unio crassus L. Philipsson in A. Retzius, 1788 Germany55 mm
Unio crassus nanus (J.B.P.A. Lamarck, 1810) Germany50 mm
Pseudodon crebristriatus J.G. Anthony, 1865 Myanmar, Pegu
Coelatura cridlandi G. Mandahl-Barth, 1954 Lake Victoria
Scabies crispata (A.A. Gould, 1843) Thailand34,19 mm
Radiatula crispisulcata (W.H. Benson, 1862) Myanmar, Pegu
Psoronaias crocodilorum (P.M.A. Morelet, 1849) Guatemala
Unio cumberlandi (FOSSIL) F.W. Woodward, 1965 † UK, Isle of Wight
Pseudodon cumingii (I. Lea, 1850) South Thailand
Hyriopsis cumingii (I. Lea, 1834) Cambodia103 mm
Fusconaia cuneolus (I. Lea, 1840) Alabama47 mm
Pleurobema curtum I. Lea, 1859 Ohio, Columbus
Anodonta cygnea (C. Linnaeus, 1758) Italy, Ravenna175 mm
Anodonta cygnea cellensis (J.F. Gmelin, 1791) Switzerland140,5 mm
Elliptio cylindracea L.S. Frierson, 1927 South Carolina, Abbeville
Toxolasma cylindrellus I. Lea, 1868 Alabama
Parreysia cylindrica T.N. Annandale& B. Prashad, 1919 India, Mysore
Theliderma cylindrica (T. Say, 1817) Pennsylvania115 mm