Pomatias ripacurcicus A. Bofill, 1915
Pomatias rivulare (K.E.I. von Eichwald,1829)
Blaesospira rocai C. de la Torre & P. Bartsch,1941
Eutudorops rocai C. de la Torre & P. Bartsch,1941
Troschelvindex rocai (C. de la Torre& P. Bartsch, 1941)
Chondropoma rolandoi C.G. Aguayo, 1943
Rhytidopoma rollei (C.D. Weinland)
Licina rollei H. von Maltzan, 1888
Annularisca romeri (C. de la Torre& P. Bartsch, 1941)
Abbottella rosaliae (L. Pfeiffer, 1858)
Annularia rosenbergi R.A. Bank, 2008
Tudora rosenbergiana (H.B. Preston, 1911)
Cyclostoma roseum A.A. Gould, 1847
Eutudorops rotundata (F. Poey, 1851)
Chondropomium rubicundum (P.M.A. Morelet, 1849)
Chondropoma rufilabrum (V.L.V. Potiez& A. Michaud, 1838)
Chondropoma rufopictum (J. Gundlachin L. Pfeiffer, 1860)
Rhytidopoma rugulosum (L. Pfeiffer, 1839)
Tudora rupis H.B. Baker, 1924
Tudora rupis hatoensis P.W. Hummelinck, 1940
Chondropoma russelli W.J. Clench, 1937
Chondrothyra rutila C. de la Torre & P. Bartsch,1938
Opisthosiphon sabinalense M.I. Sánchez Roig, 1949
Chondropometes saccharinum C. de la Torre & P. Bartsch,1938
Chondropometes sagebieni (F. Poey, 1858)
Chondropometes sagebieni portalesense C. de la Torre & P. Bartsch,1938
Colobostylus sagittifer (C.B. Adams, 1850)
Opisthosiphon sainzi C.G. Aguayo, 1934
Cyclostoma salebrosum P.M.A. Morelet, 1849
Chondropoma salleanum (L. Pfeiffer, 1850)
Opisthosiphon salustii C. de la Torre& J. Henderson, 1920
Tropidophora salvati E. Fischer-Piette& J. Bedoucha, 1965
Abbottella samanensis P. Bartsch, 1946
Abbottella sanchezi P. Bartsch, 1946
Opisthosiphon sanchezi C. de la Torre & P. Bartsch,1941