Bulimulus trifasciatus W.E. Leach, 1814 West Indies
Drymaeus trigonostomus (I.H. Jonas, 1844) Venezuela34,1 mm
Mesembrinus trimarianus (E.C. Von Martens, 1893) Mexico, Tres Marias Islands31,5 mm
Bulimulus trinidadensis A.S.H. Breure& A.C. dos Santos Coelho, 1976 Brazil, Trindade Island10 mm
Mesembrinus tripictus J.A. Albers, 1857 Costa Rica
Mesembrinus tripictus hoffmanni E.C. Von Martens, 1893 Costa Rica18,1 mm
Drymaeus trivittatus A. Mousson, 1873 South America
Naesiotus trogonius W.H. Dall, 1917 Galapagos
Mesembrinus tropicalis (P.M.A. Morelet, 1849) Mexico, Campeche27,5 mm
Suniellus troscheli (R.A. Philippi, 1867) Peru
Drymaeus trujillensis R.A. Philippi, 1867 Peru29,2 mm
Mesembrinus tryoni J.C.H. Crosse& P.H. Fischer, 1875 Mexico, Sinaloa
Bostryx tschudii F.H. Troschel, 1852 Peru, Huanuco10 mm
Bostryx tubulatus (P.M.A. Morelet, 1860)
Bostryx tubulatus scalaricostatus (P.M.A. Morelet, 1860) Peru15,5 mm
Naesiotus tubulaxis H.A. Pilsbry, 1930 Bolivia
Bostryx tumidulus (L. Pfeiffer, 1842) Peru, Huanuco22,7 mm
Kuschelenia tupacii (A.V.M.D. D'Orbigny,1835) Argentina, Tucuman48 mm
Bulimulus turritellatus H.H. Beck, 1837 Bolivia17 mm
Bostryx turritus (W.J. Broderip, 1832) Peru, Cajamarca17 mm
Rhaphiellus turritus W.K. Weyrauch, 1967 Peru, Cajamarca10 mm
Drymaeus tusagasuganus H.A. Pilsbry, 1935 Colombia
Bostryx tyleri W.H. Dall, 1912 Peru
Bulimulus ucayalensis J.C.H. Crosse, 1871 Ecuador20,4 mm
Mesembrinus uhdeanus E.C. Von Martens, 1864 Hidalgo, Mexico
Ataxus umbilicaris (L.F.A. Souleyet, 1842) Chile, Cobija13,3 mm
Mesembrinus umbraticus (L.A. Reeve, 1849) Peru, Rio Jequelepeque12,6 mm
Bulimulus unicolor (G.B. I Sowerby, 1833) Mexico, Yucatan12 mm
Naesiotus unifasciatus (G.B. I Sowerby, 1833) Galapagos17,2 mm
Bulimulus uniplicatus (A.E.J. Férussac, 1827) Brazil, Rio de Janeiro17 mm
Cochlorina uranops H.A. Pilsbry, 1898 Brazil, Minas Gerais30 mm
Naesiotus ustulatus (G.B. I Sowerby, 1833) Galapagos15,2 mm
Neopetraeus vadum H.A. Pilsbry, 1898 Peru, Cajamarca
Bostryx valdovinosi J.F. Araya, 2015
Bostryx variabilis D. Herm, 1970