Pseudamnicola chamasensis H.D. Boeters, 2000
Pyrgulopsis chamberlini R. Hershler, 1998
Bythiospeum charpyi (A. Paladilhe, 1867)
Turricaspia chersonica T.L. Alexenko& Y.I. Starobogatov, 1987
Pseudamnicola chia (E.C. Von Martens, 1889)
Pyrgulopsis chihuahua (H.A. Pilsbry, 1928)
Lithabitella chilidra (C.A. Westerlund, 1886)
Litthabitella chilodia (C.A. Westerlund, 1886)
Akiyoshia chinensis (Y.Y. Liu, W.Z. Zhang& C. Chen, 1982)
Caspiohydrobia chrysopsis (C.M. Kolesnikov, 1947)
Pyrgulopsis chupaderae D.W. Taylor, 1987
Islamia cianensis M. Bodon, G. Manganelli, I. Sparacio& F.L. Giusti, 1995
Cincinnatia cincinnatiensis (J.G. Anthony, 1840)
Pyrgula cincta (H.W. Von Abich, 1859)
Prososthenia cincta (FOSSIL) M. von Neumayr, 1869 †
Pyrgulopsis cinerana R. Hershler, T.J. Frest, H.P. Liu& E.J. Johannes, 2003
Hydrobia cingulata (FOSSIL) G. Capellini, 1880 †
Bythiospeum cisterciensorum P.L. Reischütz, 1983
Bythiospeum claisei Callot-Girardi, 2017
Leiorhagium clandestinum M. Haase & S. Zielske,2015
Bythiospeum clessini (C.D. Weinland, 1883)
Odontohydrobia clessini (FOSSIL) P.S. Pavlovic, 1927 †
Orygoceras cnemopsis (FOSSIL) Š. Brusina, 1892 †
Pseudamnicola coa (FOSSIL) Willmann, 1981 †
Grossuana codreanni (A.V. Grossu, 1946)
Micromelania coelata (FOSSIL) Š. Brusina, 1874 †
Austropyrgus colensis A. Clark, W.B. Miller& W.F. Ponder, 2003
Corrosella collingi (H.D. Boeters, H. Girardi& T. Knebelsberger, 2015)
Austropyrgus colludens A. Clark, W.B. Miller& W.F. Ponder, 2003
Jardinella colmani W.F. Ponder & K.B. Clark,1990
Pyrgulopsis coloradensis R. Hershler, 1998
Pyrgula columna B.M. Logvinenko& Y.I. Starobogatov, 1968
Marstonia comalensis (H.A. Pilsbry& J.H. Ferriss, 1906)
Caspia compacta (FOSSIL) E. Jekelius, 1944 †
Hydrobia compactilis (FOSSIL) Bell, 1893 †