Gyraulus spratti (E. Forbes, 1845)
Anisus sretenskiensis L.A. Prozorova& Y.I. Starobogatov, 1997
Gyraulus stabilis T. Iredale, 1943
Gyraulus stankovici S. Hadžišce, 1953
Biomphalaria stanleyi (E.A. Smith, 1888)
Africanogyrus starmuehlneri (G.H. Brown, 1980)
Segmentina starobogatovi N.D. Kruglov& E.V. Soldatenko, 1997
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
Segmentina stenomphalus (FOSSIL) (Š. Brusina, 1902 †)
Planorbarius stenostoma (J.R. Bourguignatin G. Servain, 1881)
Gyraulus stoppanii (F. Sacco, 1886)
Hippeutis stossichi (S. Clessin, 1878)
Biomphalaria straminea (R.W. Dunker, 1848)
Anisus strauchianus (S. Clessin, 1884)
Ancylus striatus J.R.C. Quoy & J.P. Gaimard,1833
Planorbarius striatus (FOSSIL) Roshka, 1973 †
Planorbis striatus (FOSSIL) P.M.T. de Serres, 1853 †
Gyraulus stroemi (C.A. Westerlund, 1881)
Gyraulus stromi (C.A. Westerlund, 1881)
Ancylastrum stuhlmanni E.C. Von Martens, 1897
Ancylus subcircularis S. Clessin, 1882
Ancylus subcostatus (FOSSIL) É.A. Benoist, 1873 †
Helisoma subcrenatum P.P. Carpenter, 1857
Anisus subfiliaris I.M. Moskvichevain Dworiadkin, 1980
Hippeutis subfontanus (FOSSIL) (S. Clessin, 1877 †)
Gyraulus subhemistoma (A.V.M.D. D'Orbigny,1852 )
Biomphalaria subprona (E.C. Von Martens, 1899)
Gyraulus subptychophorus (Halaváts, 1903 )
Camptoceras subspinosum T.N. Annandale & B. Prashad,1920
Anisus substroemi Y.I. Starobogatov& L.L. Budnikova, 1976
Gyraulus subtilis G. Mandahl-Barth, 1954
Gyraulus subverticillus (FOSSIL) (P. Oppenheim, 1919 †)