Bythiospeum szarowskae P. Glöer, J. Grego, Z. Eröss& Z. Fehér, 2015
Arganiella tabanensis H.D. Boeters, P. Glöer& V.M. Pešic, 2014
Muellerpalia tabensis (FOSSIL) K. Bandel, 2010 †
Mercuria tachoensis (G.R. von Frauenfeld,1865)
Pseudocaspia tadjikistanica (Z.I. Izzatullaev, 1972)
Caspiohydrobia tadzhikistanica Y.I. Starobogatov& Z.I. Izzatullaev, 1974
Staja taediosa (FOSSIL) (Š. Brusina, 1892 †)
Corrosella tajoensis (H.D. Boeters, H. Girardi& T. Knebelsberger, 2015)
Caspiohydrobia tamanensis (FOSSIL) Iljina in Iljina & al.,1976 †
Littoridinops tampicoensis (H.A. Pilsbry & A. Hinkley,1907)
Pontobelgrandiella tanevi D.G. Georgiev, 2013
Fluviopupa tangbunia S. Zielske & M. Haase,2014
Fluviopupa tanuloa S. Zielske & M. Haase,2014
Hydrobia tarchanensis (FOSSIL) Zhizhchenko, 1936 †
Belgrandia targoniana (S. Clessin, 1882)
Mercuria targouasensis P. Glöer, H.D. Boeters& Walther, 2015
Fluviopupa tasmani S. Zielske & M. Haase,2014
Beddomeia tasmanica (J.E. Tenison-Woods,1875)
Prososthenia tassoi (FOSSIL) D. Esu & O. Girotti,2001 †
Austropyrgus tateiformis A. Clark, W.B. Miller& W.F. Ponder, 2003
Austropyrgus tathraensis A. Clark, W.B. Miller& W.F. Ponder, 2003
Micromelania tauberi (FOSSIL) Sauerzopf, 1952 †
Bythiospeum taxisi (D. Geyer, 1907)
Phreatoceras taylori R. Hershler, 1995
Austropyrgus tebus A. Clark, W.B. Miller& W.F. Ponder, 2003
Tefennia tefennica H. Schütt & M.Z. Yildirim,2003
Corrosella tejedoi (H.D. Boeters, H. Girardi& T. Knebelsberger, 2015)
Tepalcatia tela F.G. Thompson & R. Hershler,2002
Hauffenia tellinii C. Pollonera, 1899
Iglica tellinii (C. Pollonera, 1887)
Socenia tenella (FOSSIL) E. Jekelius, 1944 †
Bythiospeum tenue (D. Geyer, 1905)
Littoridinops tenuipes (J.H. Couper, 1844)
Graecoanatolica tenuis P. Radoman, 1973
Brasovia tenuistriata (FOSSIL) (Roshka, 1973 †)