Bulinus succinoides E.A. Smith, 1877
Biomphalaria sudanica (E.C. Von Martens, 1870)
Helicorbis sujfunensis Y.I. Starobogatov, 1957
Anisus sulcatus B.M. Logvinenko& Y.I. Starobogatov, 1966
Gyraulus sulcatus (F.M. Hilgendorf, 1867 )
Planorbarius sulekianus (Š. Brusina, 1874)
Gyraulus sulfureus (Royo Gómez, 1922)
Fossulorbis sumichrasti (J.C.H. Crosse& P.H. Fischer, 1879)
Gyraulus supremus (F.M. Hilgendorf, 1867 )
Drepanotrema surinamense (S. Clessin, 1884)
Gyraulus symmetricus (Sauerzopf, 1953 )
Trochorbis tadzhikistanica Y.I. Starobogatov& Z.I. Izzatullaev, 1974
Segmentina taia T.N. Annandale & Surya Rao,1925
Ferrissia tanganyicensis E.A. Smith, 1906
Neoplanorbis tantillus H.A. Pilsbry, 1906
Ancylus tapirulus W. Polinski, 1929
Ferrissia tarda (T. Say)
Gyraulus taseviensis P. Glöer & A. Girod, 2013
Ferrissia tasmanica (J.E. Tenison-Woods,1876)
Gyraulus tasmanicus J.E. Tenison-Woods, 1876
Biomphalaria tchadiensis (J. Germain, 1904)
Biomphalaria temascalensis L.J. Ruiz, 1987
Biomphalaria tenagofila (A.V.M.D. D'Orbigny,1835)
Biomphalaria tenagophila (A.V.M.D. D'Orbigny,1835)
Biomphalaria tenagophila guaibensis W.L. Paraense, 1984
Pierosoma tenue (H.B. Baker, 1940)
Glyptophysa tenuilirata E.A. Smith, 1882
Ferrissia tenuis (J.R. Bourguignat, 1862)
Pierosoma tenuis (R.W. Dunker, 1850)
Gyraulus tenuistriatus (Gorjanovic-Kramberger,1899)
Biomphalaria tepicensis (E.C. Von Martens, 1899)
Camptoceras terebra W.H. Benson, 1843
Camptoceras terebra hirasei B. Walker, 1919
Anisus terekholicus L.A. Prozorova& Y.I. Starobogatov, 1997
Gyraulus terraesacrae B. Rensch, 1934