Staja simici (FOSSIL) (P.S. Pavlovic, 1903 †)
Mercuria similis (J.P.R. Draparnaud, 1805)
Pyrgulopsis similis R. Hershler, L. Ratcliffe& al., 2014
Pyrgula similis B.M. Logvinenko& Y.I. Starobogatov, 1968
Fluvidona simonsiana J.W. Brazier, 1875
Bythiospeum simovi D.G. Georgiev, 2013
Hydrobia simplex (FOSSIL) (A. Fuchs, 1877 †)
Pyrgulopsis simplex R. Hershler, 1988
Pyrgula simplex B.M. Logvinenko& Y.I. Starobogatov, 1968
Austropyrgus simsonianus (J.W. Brazier, 1875)
Phrantela singularis W.F. Ponder & K.B. Clark,1993
Hydrobia sinjana (FOSSIL) Š. Brusina, 1897 †
Austropyrgus sinuatus A. Clark, W.B. Miller& W.F. Ponder, 2003
Turricaspia sinzowii (FOSSIL) (N.I. Andrusov, 1890 †)
Dalmatella sketi F. Velkovrh, 1970
Hadziella sketi J. Bole, 1961
Saxurinator sketi (J. Bole, 1960)
Pseudamnicola skhiadica (FOSSIL) (Bukowski, 1896 †)
Lanzaia skradinensis J. Bole, 1992
Westrapyrgus slacksmithae W.F. Ponder, A. Clark& W.B. Miller, 1999
Belgrandiella slavonica P. Radoman, 1975
Prososthenia slavonica (FOSSIL) (Š. Brusina, 1874 †)
Grossuana slavyanica D.G. Georgiev & P. Glöer,2013
Alzoniella slovenica (Loek & Brtek, 1964)
Turkmenamnicola smaragdovae (Abrikosov & Y. Tzvetkov,1945)
Trochidrobia smithi W.F. Ponder, R. Hershler& B.W. Jenkins, 1989
Austropyrgus smithii (W.F. Petterd, 1889)
Fluviopupa smolwan M. Haase, Fontaine& O. Gargominy, 2010
Pontohoratia smyri M.V. Vinarski, D.M. Palatov& P. Glöer, 2014
Fluviopupa snel M. Haase, Fontaine& O. Gargominy, 2010
Hydrobia soceni (FOSSIL) E. Jekelius, 1944 †
Socenia soceni (FOSSIL) E. Jekelius, 1944 †
Micromelania soceni (FOSSIL) E. Jekelius, 1944 †
Staja soceni (FOSSIL) E. Jekelius, 1944 †
Sulawesidrobia soedjatmokoi S. Zielske, M. Glaubrecht& M. Haase, 2011