Islamia trichoniana P. Radoman, 1979
Trichonia trichonica (P. Radoman, 1973)
Nurekia triculiformis Z.I. Izzatullaev, T.Y. Sitnikova& Y.I. Starobogatov, 1985
Bania tripaloi (FOSSIL) (Š. Brusina, 1884 †)
Turricaspia triton (K.E.I. von Eichwald,1838)
Pyrgulopsis trivialis D.W. Taylor, 1987
Turricaspia trivialis (B.M. Logvinenko& Y.I. Starobogatov, 1968)
Beddomeia trochiformis W.F. Ponder & K.B. Clark,1993
Brasovia trochiformis (FOSSIL) (E. Jekelius, 1932 †)
Brasovia trochisimilis (FOSSIL) (E. Jekelius, 1932 †)
Hydrobia trochulus (FOSSIL) C.L.F. von Sandberger,1875 †
Staja trochus (FOSSIL) (N.I. Andrusov, 1890 †)
Pseudamnicola troglobia J. Bole, 1961
Orygoceras tropidophorum (FOSSIL) Š. Brusina, 1902 †
Ecrobia truncata (E.G. Vanatta, 1924)
Cyclothyrella tryoniopsis (FOSSIL) (Š. Brusina, 1874 †)
Bythiospeum tschapecki (S. Clessin, 1882)
Fluviopupa tubuaia M. Haase, O. Gargominy& Fontaine, 2005
Jardinella tullyensis W.F. Ponder, 1991
Martinietta tumida (FOSSIL) D. Kadolsky & Piechocki,2000 †
Beddomeia tumida W.F. Petterd, 1889
Austropyrgus tumidus A. Clark, W.B. Miller& W.F. Ponder, 2003
Jardinella tumorosa W.F. Ponder, 1991
Bullaregia tunisiensis Khalloufi, Béjaoui& Delicado, 2017
Pyrgulopsis turbatrix R. Hershler, 1998
Microbeliscus turbinelloides (FOSSIL) (A. Fuchs, 1870 †)
Bythiospeum turbinellum (D. Geyer, 1905)
Bythiospeum turgens R. Dehm
Spilochlamys turgida F.G. Thompson, 1969
Peringia turgidula (FOSSIL) (G.P. Deshayes, 1863 †)
Tournouerina turiecensis (FOSSIL) T.A. Neubauer& M. Harzhauser, 2015 †
Staja turislavica (FOSSIL) E. Jekelius, 1944 †
Pyrgula turkmenica B.M. Logvinenko& Y.I. Starobogatov, 1968
Beddomeia turnerae W.F. Ponder & K.B. Clark,1993
Pseudamnicola turonensis (FOSSIL) (C.L.F. von Sandberger,1875 †)