Naesiotus rugatinus W.H. Dall, 1917 Galapagos
Naesiotus rugiferus (G.B. I Sowerby, 1833) Galapagos10 mm
Drymaeus rugistriatus F. Haas, 1952 Peru
Drymaeus rugosa (A. Valenciennes, 1827) South America
Naesiotus rugulosus (G.B. I Sowerby, 1838) Galapagos20,5 mm
Naesiotus rugulosus planospira C.M.F. Ancey, 1887 Galapagos
Kora rupestris R.B. Salvador& L.R.L. Simone, 2016
Bulimulus rushii H.A. Pilsbry Uruguay21 mm
Bostryx rusticellus (P.M.A. Morelet, 1860) Peru19,9 mm
Drymaeus sachsei J.A. Albers, 1854 Peru, Piura23,3 mm
Naesiotus saeronius W.H. Dall, 1917 Galapagos
Bostryx sagasteguii F. Haas, 1966 Peru
Drymaeus sallei H.A. Pilsbry, 1899 Dominican Republic
Drymaeus sallei haitensis H.A. Pilsbry, 1899 Haiti
Vermiculatus sanborni (F. Haas, 1947) Pasco, Peru10 mm
Drymaeus sanctaemarthae H.A. Pilsbry, 1901 Colombia
Bostryx sandwicensis (L. Pfeiffer, 1846) Bolivia
Rabdotus sanmarcoensis H.A. Pilsbry & H.N. Lowe,1932 Mexico
Bulimulus sarcodes L. Pfeiffer, 1846 Honduras
Mesembrinus sargi J.C.H. Crosse& P.H. Fischer, 1875 Guatemala
Peronaeus scabiosus (G.B. I Sowerby, 1833) Chile, Atacama15,9 mm
Bostryx scalaricosta P.M.A. Morelet, 1860 Peru, Cuzco15 mm
Bostryx scalariformis (W.J. Broderip, 1832) Peru, Lima13,8 mm
Naesiotus scalesiana A.G. Smith, 1972 Galapagos
Rabdotus schiedeanus (L. Pfeiffer, 1841) USA, Texas21,5 mm
Rabdotus schiedeanus pecosensis H.A. Pilsbry& J.H. Ferriss, 1897 Texas28,3 mm
Drymaeus schmidti (L. Pfeiffer, 1854) Peru
Drymaeus schunkei F. Haas, 1949 Peru27 mm
Drymaeus scitulus (L.A. Reeve, 1849) Ecuador, Quito28 mm
Drymaeus scitulus cochambalensis W.K. Weyrauch, 1916 Cajamarca, Peru29,6 mm
Drymaeus scolioides P. Dautzenberg, 1901 Peru40,7 mm
Bostryx scotophilus W.K. Weyrauch, 1967 Peru, Lima18,1 mm
Naesiotus sculpturatus (L. Pfeiffer, 1846) Galapagos14,1 mm
Bostryx scutulatus (W.J. Broderip, 1832) Bolivia
Drymaeus selli (H.B. Preston, 1909) Guyana24 mm