Ptychotrema columellaris (E.C. Von Martens, 1876)
Streptartemon comboides (A.V.M.D. D'Orbigny,1837) Bolivia8 mm
Gulella commoda (E.A. Smith, 1903)
Streptaxis concinnus (W.T. Blanford, 1880) India, Cuddalore
Discartemon conicus T. Siriboon & S. Panha,2014 Malaysia, Kelantan
Conogulella conospira (E.C. Von Martens, 1892)
Gulella conradti B. Verdcourt, 1956 Tanzania
Parvedentulina conspicua K.C. Emberton, 2002 Madagascar
Gulella constricta K.C. Emberton, 2001 Madagascar
Streptaxis contundata (A.E.J. Férussac, 1821) Brazil18 mm
Streptaxis contusus (A.E.J. Férussac, 1821) Brazil, Rio de Janeiro7 mm
Streptartemon cookeanus F. Baker, 1914 Brazil, Rio Grande do Norte9 mm
Parennea cossyphae A.C. van Bruggen, 1989
Odontartemon costulatus O.F. von Möllendorff,1883 Vietnam, Tonkin15 mm
Streptaxis costulosus (L. Pfeiffer, 1852) Brazil, Rio de Janeiro
Gulella crassidens (L. Pfeiffer, 1859) South Africa, Zululand
Gulella crassidens jonesi A.C. van Bruggen, 1969 South Africa, Zululand
Conturbatia crenata J. Gerlach, 2001
Parvedentulina crenulata K.C. Emberton, 2002 Madagascar
Dadagulella cresswelli B. Rowson& P. Tattersfield, 2013 Tanzania, Ngorongoro
Gonaxis cressyi M. Connolly, 1922 Mozambique
Perrottetia cristatella (O.F. von Möllendorff,1901) Vietnam, Tonkin
Streptaxis crossei (L. Pfeiffer, 1867) Brazil21,5 mm
Rectartemon cryptodon (S. Moricand, 1851)
Streptartemon cumingianus (L. Pfeiffer, 1849)
Gulella cuspidata B. Verdcourt
Gonospira cylindrella (C.B. Adams, 1868) La Reunion Island3 mm
Streptaxis cypsele (L. Pfeiffer, 1849) Brazil
Gulella daedalea (J.C. Melvill& J.H. Ponsonby, 1903) South Africa9 mm
Perrottetia daedalus (A.R.J.B. Bavay& P. Dautzenberg, 1908)
Gulella davisae Herbert, 2016
Gibbulinella dealbata (P.B. Webb& S. Berthelot, 1833) Canary Islands13 mm
Streptartemon decipiens (J.C.H. Crosse, 1865) Bolivia7,8 mm
Gulella decussatula (H.B. Preston, 1913) Uganda
Streptaxis decussatus (H.A. Pilsbry, 1898) Brazil, Rio de Janeiro17 mm