Palaina catanduanica J.F. Quadras& O.F. von Möllendorff, 1895 Philippines, Catanduanes
Nicida catathymia E.R. Sykes, 1898 Sri Lanka
Arinia cathaicola H.A. Pilsbry, 1934 China, Szechwan Province
Diplommatina cebuensis O.F. von Möllendorff,1887 Philippines, Cebu3,8 mm
Diplommatina centralis J.J. Vermeulen, 1993 Malaysia, Borneo
Nicida ceylanica (R.H. Beddome, 1875) Sri Lanka
Diplommatina changensis O.K. Kwon & Y.C. Lee,1991 Korea3 mm
Plectostoma charasense (J.R. le B. Tomlin, 1948) Malaysia, Pahang
Diplommatina chenelli H.H. Godwin-Austen, 1892 India, Nagaland
Diplommatina chichiboensis J.T. Kuroda, 1956 Japan
Hungerfordia chilorhytis M. Yamazaki & Ueshima,2015
Plectostoma christae (W.J.M. Maassen, 2001) Malaysia
Arinia chrysacme O.F. von Möllendorff,1895 Philippines, Luzon Island
Diplommatina chrystallodes J.F. Quadras& O.F. von Möllendorff, 1896 Philippines, Bohol Island
Diplommatina circumstomata J.T. Kuroda & J.M. Abe,1980 Ajiro, Ehime, Japan
Arinia clausa J.J. Vermeulen, 1996 Malaysia, Borneo1,9 mm
Opisthostoma clerxi W.J.M. Maassen, 2002 Malaysia, Sabah
Diplommatina clomuncula H.H. Godwin-Austen, 1892 India, Nagaland
Diplommatina collarifera P.B. Schmacker& O. Böttger, 1890 Japan, Kanagawa3,6 mm
Diplommatina collarifera tenuiplica H.A. Pilsbry, 1900 Japan, Hyogo4,2 mm
Diplommatina concinna A. Adams, 1872 Malaysia, Borneo
Plectostoma concinnum (H.C. Fulton, 1901) Malaysia, Borneo3 mm
Diplommatina concolor J.F. Quadras& O.F. von Möllendorff, 1893 Philippines, Luzon Island2,5 mm
Diplommatina congener E.A. Smith, 1894 Malaysia, Borneo
Palaina conspicua O.F. von Möllendorff,1893 Philippines, Luzon Island
Diplommatina contracta O.F. von Möllendorff,1886 China, Jiangxi province, Jiujiang3,7 mm
Opisthostoma cookei E.A. Smith, 1894 Malaysia
Habeas corpus L.R.L. Simone, 2013 Brazil, Bahia10 mm
Adelopoma costaricense P. Bartsch& J.P.E. Morrison, 1942 Costa Rica
Arinia costata O.F. von Möllendorff,1887 Philippines, Cebu
Palaina coxi A. Adams, 1868 Norfolk Island
Opisthostoma crassicolle J.J. Vermeulen, 1994 Malaysia, Sabah
Plectostoma crassipupa (W.S.S. Van Benthem-Jutting, 1952) Malaysia, Pahang
Opisthostoma crassum J.J. Vermeulen, 1994 Malaysia, Borneo
Diplommatina crispata F. Stoliczka Thailand, Suratthani