Seminolina seminole (FOSSIL) (H.A. Pilsbry, 1934 †)
Bulinus senegalensis O.F. Müller, 1781
Anisus septemgyratiformis (FOSSIL) (F. Gottschick, 1911 †)
Anisus septemgyratus (E.A. Rossmässler, 1835)
Ancylus serbicus (FOSSIL) Š. Brusina, 1893 †
Kolhymorbis shadini Y.I. Starobogatov& E.A. Streletzkaja, 1967
Gyraulus shamaricus Z.I. Izzatullaev, 1972
Ferrissia sharpi (E.R. Sykes, 1900)
Gyraulus shasi P. Glöer & V.M. Pešic,2007
Helicorbis shilkaensis Y.I. Starobogatov, 1996
Ferrissia shimekii (H.A. Pilsbry, 1890)
Ferrissia siamensis R.A.M. Brandt, 1974
Gyraulus siamensis (E.C. Von Martens, 1867)
Gyraulus sibinjensis (Š. Brusina, 1897)
Hebetancylus sicula (W.P.E.S. Rüppell, 1844)
Planorbis sieversi A. Mousson, 1873
Planorbis sisurnius C. Hedley, 1918
Gyraulus sivalensis (S. Clessin, 1884)
Gyraulus slavonicus (Š. Brusina, 1897)
Neoplanorbis smithi B. Walker, 1908
Biomphalaria smithi H.B. Preston, 1910
Planorbula smithii H.B. Baker, 1945
Gyraulus soceni E. Jekelius, 1944
Gyraulus socotrensis H.H. Godwin-Austen, 1883
Physopsis soleilleti J.R. Bourguignat, 1885
Gyraulus solenoeides (Lörenthey, 1902 )
Vorticifex solida W.H. Dall, 1870
Planorbarius solidus (FOSSIL) (Thomä, 1845 †)
Gyraulus soritai T. Habe, 1976
Gyraulus spirillus A.A. Gould, 1859
Anisus spirorbis (C. Linnaeus, 1758)
Menetus spiruloides (FOSSIL) (G.P. Deshayes, 1863 †)
Planorbis spissus A.E.M. Cossmann, 1907
Umbrellancylus splendidus (FOSSIL) Piton, 1940 †
Anisus spondyloides (C.D. Weinland, 1883)