Cryptassiminea buccinoides (J.R.C. Quoy& J.P. Gaimard, 1834)
Pseudocyclotus buehleri B. Rensch, 1937
Omphalotropis bulboides B. Rensch, 1937
Atropis bythinellaeformis A. Garrett, 1884
Acmella caelata J.J. Vermeulen & D.J. Junau,2007
Fijianella calciphila C.M. Cooke & W.J. Clench,1943
Omphalotropis caledonica (J.C.H. Crosse, 1872)
Angustassiminea californica (G.W. Tryon, 1865)
Dominamaria calvata (A. Wiktor, 1998)
Pseudogibbula cara (FOSSIL) H.A. Pilsbry& C.E. Beecher, 1929 †
Assiminea carinata H.C. Lea, 1856
Omphalotropis carolinensis E.A. Smith, 1891
Angustassiminea castanea (C.A. Westerlund, 1883)
Omphalotropis ceramensis L. Pfeiffer, 1862
Omphalotropis cerea L. Pfeiffer, 1857
Omphalotropis cheynei (W.L.H. Dohrn& C.G. Semper, 1862)
Assiminea cienegensis R. Hershler, H.P. Liu& H.G. Lang, 2007
Assiminea cincta A. Adams, 1861
Omphalotropis circumlineata (A. Mousson, 1870)
Quadrasiella clathrata O.F. von Möllendorff,1894
Suterilla climoi H. Fukuda, W.F. Ponder& B.A. Marshall, 2006
Assiminea compacta (P.P. Carpenter, 1864)
Acmella conica J.J. Vermeulen & D.J. Junau,2007
Paludinella conica (J.F. Quadras& O.F. von Möllendorff, 1894)
Omphalotropis cookei R.T. Abbott, 1949
Thaanumella cookei W.J. Clench, 1946
Assiminea cornea (A. Leith, 1853)
Fijianella cornucopia C.M. Cooke & W.J. Clench,1943
Scalinella costata (W.H. Pease, 1868)
Omphalotropis costulata (A. Mousson, 1870)
Omphalotropis coturnix (J.C.H. Crosse, 1867)
Pseudocyclotus coultasi W.J. Clench, 1959
Assiminea crassitesta O. Böttger, 1893
Omphalotropis curta A. Garrett, 1879
Acmella cyrtoglyphe J.J. Vermeulen, T.S. Liew& M. Schilthuizen, 2015