Neripteron rubicunda E.C. Von Martens, 1879
Neritina rubricata P.M.A. Morelet, 1858
Neritina rudia A. Mousson, 1857
Clithon rugatus C.A. Récluz, 1842
Velates rugatus (FOSSIL) Abbass, 1967 †
Clithon ruginosus C.A. Récluz, 1841
Theodoxus rugosus (FOSSIL) (P.S. Pavlovic, 1931 †)
Nerita rugulosa (FOSSIL) G.J. Vermeij, M.A. Frey& B.M. Landau, 2009 †
Vitta rumeliana (FOSSIL) M. Harzhauser, O. Mandic& al., 2016 †
Theodoxus saincenyensis (FOSSIL) G.P. Deshayes, 1864 †
Theodoxus sandalina C.A. Récluz, 1842
Nerita sandbergeri (FOSSIL) Fischer & W.A. Wenz,1912 †
Neritina sanguinea G.B. I Sowerby, 1849
Theliostyla sanguinolenta (K.T. Menke, 1829)
Theliostyla sanguinolenta marmorata L.A. Reeve, 1855
Septaria sanguisuga (L.A. Reeve, 1856)
Theodoxus sarmaticus (W.A. Lindholm, 1901)
Theodoxus saulcyi (J.R. Bourguignat, 1852)
Nerita sayana C.A. Récluz, 1844
Nerita scabricosta J.B.P.A. Lamarck, 1822
Nerita scabricosta ornata (G.B. I Sowerby, 1833)
Theodoxus scamandrius (FOSSIL) (Calvert& M. von Neumayr, 1880 †)
Theodoxus schachmaticus (FOSSIL) (N.I. Andrusov, 1909 †)
Agapilia schlickumi (FOSSIL) T. Kowalke& Reichenbacher, 2005 †
Theodoxus schultzi (O.A. Grimm, 1877)
Theodoxus scoliogramma (FOSSIL) (Š. Brusina, 1884 †)
Theodoxus scriptus (FOSSIL) (Stefanescu, 1896 †)
Neritina seani (FOSSIL) B.M. Landau, F. Da Silva& S.M. Heitz, 2016 †
Neritina semiconica (J.B.P.A. Lamarck, 1822)
Theodoxus semidentatus (FOSSIL) (C.L.F. von Sandberger,1875 †)
Nerita semilevis (FOSSIL) L.W. Stephenson, 1953 †
Nerita semilugubris (FOSSIL) G.P. Deshayes, 1864 †
Theodoxus semiplicatus (FOSSIL) (M. von Neumayr, 1875 †)
Nerita semirugosa C.A. Récluz, 1841
Nerita senegalensis J.F. Gmelin, 1791