Palaina catanduanica J.F. Quadras& O.F. von Möllendorff, 1895
Nicida catathymia E.R. Sykes, 1898
Arinia cathaicola H.A. Pilsbry, 1934
Diplommatina cebuensis O.F. von Möllendorff,1887
Diplommatina centralis J.J. Vermeulen, 1993
Nicida ceylanica (R.H. Beddome, 1875)
Diplommatina changensis O.K. Kwon & Y.C. Lee,1991
Plectostoma charasense (J.R. le B. Tomlin, 1948)
Diplommatina chenelli H.H. Godwin-Austen, 1892
Diplommatina chichiboensis J.T. Kuroda, 1956
Hungerfordia chilorhytis M. Yamazaki & Ueshima,2015
Plectostoma christae (W.J.M. Maassen, 2001)
Arinia chrysacme O.F. von Möllendorff,1895
Diplommatina chrystallodes J.F. Quadras& O.F. von Möllendorff, 1896
Diplommatina circumstomata J.T. Kuroda & J.M. Abe,1980
Arinia clausa J.J. Vermeulen, 1996
Opisthostoma clerxi W.J.M. Maassen, 2002
Diplommatina clomuncula H.H. Godwin-Austen, 1892
Diplommatina collarifera P.B. Schmacker & O. Böttger,1890
Diplommatina collarifera tenuiplica H.A. Pilsbry, 1900
Diplommatina concinna A. Adams, 1872
Plectostoma concinnum (H.C. Fulton, 1901)
Diplommatina concolor J.F. Quadras& O.F. von Möllendorff, 1893
Diplommatina congener E.A. Smith, 1894
Palaina conspicua O.F. von Möllendorff,1893
Diplommatina contracta O.F. von Möllendorff,1886
Opisthostoma cookei E.A. Smith, 1894
Habeas corpus L.R.L. Simone, 2013
Adelopoma costaricense P. Bartsch& J.P.E. Morrison, 1942
Arinia costata O.F. von Möllendorff,1887
Palaina coxi A. Adams, 1868
Opisthostoma crassicolle J.J. Vermeulen, 1994
Plectostoma crassipupa (W.S.S. Van Benthem-Jutting, 1952)
Opisthostoma crassum J.J. Vermeulen, 1994
Diplommatina crispata F. Stoliczka