Seminolina seminole (FOSSIL) (H.A. Pilsbry, 1934 †) Florida
Bulinus senegalensis O.F. Müller, 1781 Senegal, Dakar2 mm
Anisus septemgyratiformis (FOSSIL) (F. Gottschick, 1911 †)
Anisus septemgyratus (E.A. Rossmässler, 1835) Italy, Brescia
Ancylus serbicus (FOSSIL) Š. Brusina, 1893 †
Kolhymorbis shadini Y.I. Starobogatov& E.A. Streletzkaja, 1967 Lake Baikal, Russia
Gyraulus shamaricus Z.I. Izzatullaev, 1972
Ferrissia sharpi (E.R. Sykes, 1900) Hawaii
Gyraulus shasi P. Glöer & V.M. Pešic,2007 Montenegro
Helicorbis shilkaensis Y.I. Starobogatov, 1996 Lake Baikal, Russia
Ferrissia shimekii (H.A. Pilsbry, 1890) USA
Ferrissia siamensis R.A.M. Brandt, 1974 Thailand
Gyraulus siamensis (E.C. Von Martens, 1867) Cambodia
Gyraulus sibinjensis (Š. Brusina, 1897)
Hebetancylus sicula (W.P.E.S. Rüppell, 1844)
Planorbis sieversi A. Mousson, 1873
Planorbis sisurnius C. Hedley, 1918 Northern Territory
Gyraulus sivalensis (S. Clessin, 1884) Nepal
Gyraulus slavonicus (Š. Brusina, 1897)
Neoplanorbis smithi B. Walker, 1908 Alabama, Coosa River
Biomphalaria smithi H.B. Preston, 1910 Bahamas
Planorbula smithii H.B. Baker, 1945 Alabama, Jackson County
Gyraulus soceni E. Jekelius, 1944
Gyraulus socotrensis H.H. Godwin-Austen, 1883 Yemen, Socotra Island
Physopsis soleilleti J.R. Bourguignat, 1885 Ethiopia11,7 mm
Gyraulus solenoeides (Lörenthey, 1902 )
Vorticifex solida W.H. Dall, 1870 Nevada
Planorbarius solidus (FOSSIL) (Thomä, 1845 †) France, Aquitaine15 mm
Gyraulus soritai T. Habe, 1976 Greece
Gyraulus spirillus A.A. Gould, 1859 Philippines, Camotes Island5 mm
Anisus spirorbis (C. Linnaeus, 1758) Czech Republic
Menetus spiruloides (FOSSIL) (G.P. Deshayes, 1863 †) France, Paris Basin
Planorbis spissus A.E.M. Cossmann, 1907
Umbrellancylus splendidus (FOSSIL) Piton, 1940 †
Anisus spondyloides (C.D. Weinland, 1883)