Provalenciennesia schafarziki (FOSSIL) (Gorjanovic-Kramberger,1901 †)
Lymnaea schelechovi N.D. Kruglov& Y.I. Starobogatov, 1989
Galba schirazensis H.C. Küster, 1862
Lymnaea schubinae N.D. Kruglov& Y.I. Starobogatov, 1984
Omphiscola servica (FOSSIL) Kovalenko, 2004 †
Lymnaea shanensis T.N. Annandale, 1918
Galba shirazensis (Küster, 1862)
Galba sibirica (C.A. Westerlund, 1885)
Lymnaea sihotealinica N.D. Kruglov& Y.I. Starobogatov, 1984
Radix simplex (FOSSIL) (Gorjanovic-Kramberger,1899 †)
Lymnaea sirikulensis (G. Nevill, 1878)
Radix skutaris P. Glöer & V.M. Pešic,2008
Radix socialis (FOSSIL) (Zieten, 1832 †)
Streptocerella sokolovi (FOSSIL) Andrussov, 1903 †
Radix solidissima (W. Kobelt, 1872)
Fossaria sonomaensis (H. Hemphill, 1906)
Zagrabica spiridionis (FOSSIL) N.I. Andrusov, 1909 †
Lymnaea stagnalis (C. Linnaeus, 1758)
Omphiscola steklovi (FOSSIL) (Kovalenko in V.V. Anistratenko& al., 1991 †)
Lymnaea stojadinovici (FOSSIL) Miloševic, 1981 †
Lymnaea stoppanianus (FOSSIL) Coppi, 1876 †
Lymnaea streletzkajae N.D. Kruglov& Y.I. Starobogatov, 1985
Lymnaea striatella (FOSSIL) J.P.S. Grateloup, 1827 †
Zagrabica subampullacea (FOSSIL) N.I. Andrusov, 1909 †
Lymnaea subangulata (J.F.X. Roffiaen, 1868)
Radix subauricularia (FOSSIL) (A.V.M.D. D'Orbigny,1852 †)
Radix subbullata (FOSSIL) C.L.F. von Sandberger,1875 †
Lymnaea subdisjuncta (G. Nevill, 1878)
Lymnaea subfragilis (FOSSIL) A.V.M.D. D'Orbigny,1852 †
Radix subinflata (FOSSIL) (A.V.M.D. D'Orbigny,1852 †)
Radix sublimosa (FOSSIL) (Sinzov, 1875 †)
Galba subminuta (FOSSIL) (J. Almera& Bofill y Poch, 1895 †)
Galba suboblonga (FOSSIL) (Kovalenko, 1994 †)
Radix subovata (FOSSIL) (Zieten, 1832 †)
Radix subovata pachygaster (FOSSIL) (Thomä, 1845 †)