Stagnicola subpalustris (FOSSIL) (Thomä, 1845 †)
Lanx subrotundata (G.W. Tryon, 1865)
Galba subtruncatula (FOSSIL) (S. Clessin, 1885 †)
Lymnaea succinoides (FOSSIL) P.M.T. de Serres, 1853 †
Valenciennius suchovae (FOSSIL) Taktakishvili, 1967 †
Galba suevica (FOSSIL) (W.A. Wenz, 1916 †)
Stagnicola sumassi (W. Baird, 1863)
Acella suptilis (FOSSIL) (P.S. Pavlovic, 1931 †)
Valenciennius syrmicus (FOSSIL) Stevanovic, 1990 †
Stagnicola syrtica (FOSSIL) (M.A. Peyrot, 1932 †)
Lymnaea taurica (S. Clessin, 1880)
Fossaria tazewelliana (A.J.C. Wolf, 1869)
Lymnaea tchihatcheffi (FOSSIL) Fischer in Tchihatcheff,1866 †
Stagnicola tekecus P. Glöer & M.Z. Yildirim,2006
Lymnaea teletzkiana N.D. Kruglov& Y.I. Starobogatov, 1984
Lymnaea tenera (H.C. Küster, 1863)
Lymnaea tengriana N.D. Kruglov& Y.I. Starobogatov, 1984
Ladislavella terebra (C.A. Westerlund, 1885)
Ladislavella terebra lindholmi (W. Dybowski, 1913)
Lymnaea thermobaicalica N.D. Kruglov& Y.I. Starobogatov, 1989
Lymnaea thermokamtschatica N.D. Kruglov& Y.I. Starobogatov, 1989
Austropeplea tomentosa (L. Pfeiffer, 1855)
Lymnaea torquilla (C.A. Westerlund, 1876)
Velutinopsis transiens (FOSSIL) Moos, 1944 †
Acella transsilvanica (FOSSIL) (Roth, 1881 †)
Stagnicola traski G.W. Tryon, 1863
Lymnaea truci (FOSSIL) W.R. Schlickum& F. Strauch, 1979 †
Lymnaea truncatella (O.F. Müller, 1774)
Galba truncatula (O.F. Müller, 1774)
Lymnaea tumrokensis N.D. Kruglov& Y.I. Starobogatov, 1985
Lymnaea tungabhadraensis H.C. Ray, 1967
Stagnicola turricula F. Held, 1836
Lymnaea turrita (FOSSIL) E. Klein, 1853 †
Omphiscola ukrainica (FOSSIL) Kovalenko, 2004 †
Lymnaea ulaganica N.D. Kruglov& Y.I. Starobogatov, 1983