Jekeliella tenuistriata (FOSSIL) (A. Fuchs, 1870 †)
Bythiospeum terveri (É.A.A. Locard, 1882)
Pyrgula tessellata (FOSSIL) Š. Brusina, 1897 †
Hydrobia thaanumi H.A. Pilsbry, 1900
Salalahia thaytinitiensis (FOSSIL) D. Kadolsky, M. Harzhauser& T.A. Neubauer, 2015 †
Belgrandia thermalis (C. Linnaeus, 1767)
Hadziella thermalis J. Bole, 1992
Pyrgulopsis thermalis D.W. Taylor, 1987
Dianella thiesseana (W. Kobelt, 1878)
Pseudamnicola tholosa (FOSSIL) E. Jekelius, 1944 †
Pyrgulopsis thompsoni R. Hershler, 1988
Grossuana thracica P. Glöer & D.G. Georgiev,2009
Marticia tietzei (FOSSIL) (M. von Neumayr, 1880 †)
Hydrobia timisiensis (FOSSIL) E. Jekelius, 1944 †
Mercuria tingitana P. Glöer, H.D. Boeters& Walther, 2015
Fluviopupa titusi M. Haase, Fontaine& O. Gargominy, 2010
Beddomeia topsiae W.F. Ponder & K.B. Clark,1993
Bania torbariana (FOSSIL) (Š. Brusina, 1874 †)
Belgrandia torifera H. Schütt, 1961
Micromelania toroki (FOSSIL) (Lörenthey, 1894 †)
Hydrobia torrei H.A. Pilsbry & C.G. Aguayo,1933
Fluviopupa torresiana M. Haase, Fontaine& O. Gargominy, 2010
Pyrgulopsis torrida R. Hershler,H.X. Liu & al., 2016
Hydrobia tournoueri (FOSSIL) C.L.F. von Sandberger,1875 †
Prososthenia tournoueri (FOSSIL) (M. von Neumayr, 1869 †)
Hauffenia tovunica P. Radoman, 1978
Sulawesidrobia towutiensis S. Zielske, M. Glaubrecht& M. Haase, 2011
Pseudamnicola transilvanica (FOSSIL) (Š. Brusina, 1902 †)
Pyrgula transitans (FOSSIL) (M. von Neumayr, 1875 †)
Bythiospeum transsylvanica (M. Rotarides, 1943)
Pyrgulopsis transversa R. Hershler, 1998
Pseudamnicola triangula (FOSSIL) Pana, 2005 †
Plagigeyeria tribunicae H. Schütt, 1963
Micromelania tricarinata (FOSSIL) Lörenthey, 1893 †
Probaicalia tricarinata (FOSSIL) Pan, 1980 †