Gyraulus spratti (E. Forbes, 1845)
Anisus sretenskiensis L.A. Prozorova& Y.I. Starobogatov, 1997
Gyraulus stabilis T. Iredale, 1943 Queensland
Gyraulus stankovici S. Hadžišce, 1953 Macedonia, Lake Prespa
Biomphalaria stanleyi (E.A. Smith, 1888) Central Africa
Africanogyrus starmuehlneri (G.H. Brown, 1980)
Segmentina starobogatovi N.D. Kruglov& E.V. Soldatenko, 1997 Kaliningrad
Polypylis starobogatovi Z.I. Izzatullaev, 1973
Gyraulus steinheimensis (F.M. Hilgendorf, 1867 )
Anisus stelmachoetius (J.R. Bourguignat, 1860)
Ancylastrum stenochorias J.C. Melvill& J.H. Ponsonby, 1903 South Africa
Segmentina stenomphalus (FOSSIL) (Š. Brusina, 1902 †)
Planorbarius stenostoma (J.R. Bourguignat in G. Servain, 1881)
Gyraulus stoppanii (F. Sacco, 1886)
Hippeutis stossichi (S. Clessin, 1878) Croatia
Biomphalaria straminea (R.W. Dunker, 1848) Dominica3 mm
Anisus strauchianus (S. Clessin, 1884) Ukraine
Ancylus striatus J.R.C. Quoy& J.P. Gaimard, 1833 Canary Islands6,2 mm
Planorbarius striatus (FOSSIL) Roshka, 1973 †
Planorbis striatus (FOSSIL) P.M.T. de Serres, 1853 †
Gyraulus stroemi (C.A. Westerlund, 1881) Russia, Sakhalin
Gyraulus stromi (C.A. Westerlund, 1881) Northern Europe, Siberia, Russian Far East
Ancylastrum stuhlmanni E.C. Von Martens, 1897 Central Africa
Ancylus subcircularis S. Clessin, 1882
Ancylus subcostatus (FOSSIL) É.A. Benoist, 1873 †
Helisoma subcrenatum P.P. Carpenter, 1857 Missouri, Nodaway County15,1 mm
Anisus subfiliaris I.M. Moskvicheva in Dworiadkin, 1980 Russia, Sakhalin
Hippeutis subfontanus (FOSSIL) (S. Clessin, 1877 †)
Gyraulus subhemistoma (A.V.M.D. D'Orbigny,1852 )
Biomphalaria subprona (E.C. Von Martens, 1899) Guatemala
Gyraulus subptychophorus (Halaváts, 1903 )
Camptoceras subspinosum T.N. Annandale& B. Prashad, 1920 India, Cuddalore
Anisus substroemi Y.I. Starobogatov& L.L. Budnikova, 1976 Kamchatka
Gyraulus subtilis G. Mandahl-Barth, 1954 Lake Victoria
Gyraulus subverticillus (FOSSIL) (P. Oppenheim, 1919 †) Turkey, Dumlupinar