Gyraulus coranus T. Iredale, 1943 Tasmania
Africanogyrus coretus (H.M.D. de Blainville,1826) South Africa
Bulinus corici (FOSSIL) M. Harzhauser & al.,2012 † Austria, Steiermark
Gyraulus corinna (J.E. Gray, 1850) Hawaii
Planorbarius corneus (C. Linnaeus, 1758) Belgium20,1 mm
Planorbarius cornu (FOSSIL) (A. Brongniart, 1810 †) Czech Republic, Chomutov
Planorbarius cornucopia (FOSSIL) (J.L.Jr. Baily, 1858 †)
Planorbis cornusolidus (FOSSIL) Thomä, 1845 † France, Aquitaine22 mm
Planorbella corpulenta (T. Say, 1824) Canada, Ontario
Anisus correctus (C.A. Westerlund, 1897) Finland, Kuopio
Glyptophysa cosmeta T. Iredale, 1943 New South Wales
Pierosoma costaricense (H.B. Preston, 1907) Costa Rica
Biomphalaria costata W.A. Biese, 1951 Chile, Iquique10,4 mm
Gyraulus costatus (E. Klein, 1846 )
Gyraulus costulatus (C.F.F. von Krauss, 1848) Congo, Pointe Noire
Biomphalaria cousini W.L. Paraense, 1966
Planorbula crassilabris (B. Walker) Michigan, Wayne County
Africanogyrus crassilabrum (P.M.A. Morelet, 1860) Mozambique, Comoro Islands
Ancylastrum crassistriata H.B. Preston, 1911 East Africa
Planorbarius crassus (FOSSIL) (P.M.T. de Serres,1844 †)
Anisus crassus (E.M. Da Costa, 1778)
Gyraulus crassus G. Mandahl-Barth, 1954 Lake Victoria
Ferrissia crenellata (FOSSIL) M. Harzhauser & al.,2012 † Austria, Steiermark
Gyraulus crenophilus B. Hubendick& P. Radoman, 1959 Macedonia, Lake Ohrid
Biomphalaria crequii (G. Courty, 1907) Bolivia, Lake Titicaca
Gyraulus crescens (F.M. Hilgendorf, 1867 )
Ancylina cretacea (FOSSIL) (L. von G. Tausch,1886 †) Hungary, Bakony
Planorbis cretensis P. Glöer& H.J. Hirschfelder, 2015 Greece,2,9 mm
Gyraulus crista (C. Linnaeus, 1758) Italy, Pisa
Gyraulus cristaeformis (Gozhik & Prysjazhnjuk,1978)
Biomphalaria cristiani Fuentealba & Figueroa,2012
Choanomphalus cryptomphalus W. Dybowski, 1901 Lake Baikal, Russia
Gyraulus cryptornatus (Sauerzopf, 1953 )
Bulinus crystallinus P.M.A. Morelet, 1868 Angola
Fossulorbis cultratum (A.V.M.D. D'Orbigny,1841) Martinique