Opisthosiphon pupoides velazquezi C. de la Torre & P. Bartsch,1941
Tropidophora pyrostoma (G.B. Sowerby, 1843)
Parachondria pyrostoma H.A. Pilsbry, 1930
Hispanipoma quaternatum (J.B.P.A. Lamarck)
Opisthosiphon quesadai C.G. Aguayo, 1932
Opisthosiphon quinti C. de la Torre & P. Bartsch,1941
Chondropoma quisquense P. Bartsch, 1946
Chondropoma quisquense sculptior P. Bartsch, 1946
Dioscopoma radiolatum (E.C. Von Martens, 1881)
Choanopoma radiosum (P.M.A. Morelet, 1849)
Annularisca ramsdeni (H.A. Pilsbry& J. Henderson, 1912)
Tudorina rangelina (F. Poey, 1851)
Cyclostoma rangii A.E.J. Férussac, 1827
Pomatias raricosta (T.V. Wollaston, 1878)
Cistulops raveni (J.C.H. Crosse, 1872)
Chondropoma rawsoni L. Pfeiffer, 1867
Opisthosiphon rayi C. de la Torre & P. Bartsch,
Wrightudora recta (J. Gundlachin L. Pfeiffer, 1863)
Colobostylus redfieldianus (C.B. Adams)
Colobostylus redfieldianus magnitesta (H.B. Baker, 1934)
Tropidophora reesi E. Fischer-Piette, 1949
Chondrothyretes reticulata (C. de la Torre& P. Bartsch, 1938)
Chondrothyretes reticulata costanerensis (C. de la Torre& P. Bartsch, 1938)
Chondrothyretes reticulata fratercula (C. de la Torre& P. Bartsch, 1938)
Chondrothyretes reticulata saccharinella (C. de la Torre& P. Bartsch, 1938)
Chondrothyretes reticulata scrobiculata (C. de la Torre& P. Bartsch, 1938)
Tropidophora reticulata A. Adams & L.A. Reeve,1850
Chondropoma retreatense H.B. Baker, 1934
Annularia retrorsa C.B. Adams, 1850
Chondropoma revinctum (F. Poey, 1851)
Chondropoma revocatum (J. Gundlachin L. Pfeiffer, 1857)
Georgia revoili J.R. Bourguignat, 1882
Meganipha rhecta F.G. Thompson, 1978
Choanopoma rigidulum (P.M.A. Morelet, 1851)
Parachondria riisei (L. Pfeiffer, 1852)