Bulimulus trifasciatus W.E. Leach, 1814
Drymaeus trigonostomus (I.H. Jonas, 1844)
Mesembrinus trimarianus (E.C. Von Martens, 1893)
Bulimulus trinidadensis A.S.H. Breure& A.C. dos Santos Coelho, 1976
Mesembrinus tripictus J.A. Albers, 1857
Mesembrinus tripictus hoffmanni E.C. Von Martens, 1893
Drymaeus trivittatus A. Mousson, 1873
Naesiotus trogonius W.H. Dall, 1917
Mesembrinus tropicalis (P.M.A. Morelet, 1849)
Suniellus troscheli (R.A. Philippi, 1867)
Drymaeus trujillensis R.A. Philippi, 1867
Mesembrinus tryoni J.C.H. Crosse& P.H. Fischer, 1875
Bostryx tschudii F.H. Troschel, 1852
Bostryx tubulatus (P.M.A. Morelet, 1860)
Bostryx tubulatus scalaricostatus (P.M.A. Morelet, 1860)
Naesiotus tubulaxis H.A. Pilsbry, 1930
Bostryx tumidulus (L. Pfeiffer, 1842)
Kuschelenia tupacii (A.V.M.D. D'Orbigny,1835)
Bulimulus turritellatus H.H. Beck, 1837
Bostryx turritus (W.J. Broderip, 1832)
Rhaphiellus turritus W.K. Weyrauch, 1967
Drymaeus tusagasuganus H.A. Pilsbry, 1935
Bostryx tyleri W.H. Dall, 1912
Bulimulus ucayalensis J.C.H. Crosse, 1871
Mesembrinus uhdeanus E.C. Von Martens, 1864
Ataxus umbilicaris (L.F.A. Souleyet, 1842)
Mesembrinus umbraticus (L.A. Reeve, 1849)
Bulimulus unicolor (G.B. I Sowerby, 1833)
Naesiotus unifasciatus (G.B. I Sowerby, 1833)
Bulimulus uniplicatus (A.E.J. Férussac, 1827)
Cochlorina uranops H.A. Pilsbry, 1898
Naesiotus ustulatus (G.B. I Sowerby, 1833)
Neopetraeus vadum H.A. Pilsbry, 1898
Bostryx valdovinosi J.F. Araya, 2015
Bostryx variabilis D. Herm, 1970