Theodoxus stefanescui (FOSSIL) (C.F. Fontannes, 1887 †)
Theodoxus stefanescuiformis (FOSSIL) Gozhik in Gozhik& Datsenko, 2007 †
Theodoxus stoicai (FOSSIL) T.A. Neubauer, M. Harzhauser, E. Georgopoulou, O. Mandic& A. Kroh, †
Nerita striata E.J. Burrow, 1815
Clithon striolatus (C.A. Récluz, 1841)
Neritina subangularis (FOSSIL) (C.L.F. von Sandberger,1860 †)
Neripteron subauriculatum (C.A. Récluz, 1843)
Ninnia subcarinata (FOSSIL) N.I. Andrusov, 1909 †
Theodoxus subdoricus (FOSSIL) H. Schütt, 1976 †
Theodoxus subglobosus (FOSSIL) (K.E.I. von Eichwald,1853 †)
Clithon subgranosus (G.B. I Sowerby, 1831)
Neritina subocellata (J.R.C. Quoy& J.P. Gaimard, 1832)
Neritoplica subornata (FOSSIL) (Orbigny, 1850 †)
Clithon subpunctatus C.A. Récluz, 1843
Theodoxus subquadrofasciatus (FOSSIL) Gozhik, 2002 †
Clithon subrugatus W. Baird, 1850
Nerita subrugosa (FOSSIL) Hudleston †
Theodoxus subslavonicus (FOSSIL) Gozhik, 2002 †
Neritodryas subsulcata (G.B. I Sowerby, 1836)
Theodoxus subterrelictus H. Schütt, 1963
Theodoxus subthermalis J.R. Bourguignatin A. Issel, 1865
Neripteron subviolaceum T.C. Eichhorst, 2016
Septaria suffreni (C.A. Récluz, 1841)
Neritina sulcata J.E. Tenison-Woods, 1878
Neritina sulculosa (J.R.C. Quoy& J.P. Gaimard, 1832)
Theodoxus sundicus (FOSSIL) (N.I. Andrusov, 1909 †)
Theodoxus suskalovici (FOSSIL) (P.S. Pavlovic, 1903 †)
Theodoxus sycophantus (FOSSIL) (Š. Brusina, 1878 †)
Theodoxus syriacus (J.R. Bourguignat, 1852)
Septaria tahitiana Eichhorst, 2016
Septaria taitana A. Mousson, 1869
Neritina taitensis (R.P. Lesson, 1831)
Ninnia taonura (FOSSIL) N.I. Andrusov, 1909 †
Velates tebanensis (FOSSIL) Abbass, 1967 †
Fluvinerita tenebricosa (C.B. Adams, 1851)