Teinostoma texanum (FOSSIL) K.V.W. Palmer, 1937 †
Circulus texanus (D.R. Moore, 1965)
Anticlimax textilis F. Rubio & E. Rolán, 2014
Vitrinella thomasi H.A. Pilsbry, 1945
Vitrinella tiburonensis J.W. Durham, 1942
Vitrinella tincta C.B. Adams, 1850
Ponderinella tornatica (R.G. Moolenbeek& H.J. Hoenselaar, 1995)
Circulus tornatus (A. Adams, 1864)
Circlotoma transculpta C.F. Laseron, 1958
Pseudoliotia tribulationis (C. Hedley, 1909)
Circulus tricarinatus (FOSSIL) (J.L.M. Defrance, 1828 †)
Cyclostremiscus tricarinatus (C.B. Adams, 1852)
Cyclostremiscus trigonatus (P.P. Carpenter, 1857)
Tornus trigonostoma (FOSSIL) (B. de Basterot, 1825 †)
Cyclostremiscus trilix (K.J. Bush, 1885)
Tornus trochiformis É.A.A. Locard, 1886
Tornus trochulus A. Adams, 1863
Pseudoliotia tropica C.F. Laseron, 1958
Solariorbis truncatus (W.M. Gabb, 1881)
Vitrinella tryoni K.J. Bush, 1897
Cochliolepis tugelae K.H. Barnard, 1963
Teinostoma tumens (P.P. Carpenter, 1857)
Scrupus tumidus (FOSSIL) C.R. Laws, 1948 †
Cochliolepis turtoni (P. Bartsch, 1915)
Teinostoma ultimum H.A. Pilsbry & A.A. Olsson,1945
Caperella umbilicata C.F. Laseron, 1958
Teinostoma umbilicatum (Lea, 1843)
Tornus umbilicorda E. Rolán & F. Rubio, 2002
Anticlimax umbiliglabra F. Rubio & E. Rolán, 2014
Anticlimax umbriensis (FOSSIL) Fischer & al., 2002 †
Elachorbis unicarina (FOSSIL) C.R. Laws, 1940 †
Cyclostremiscus unicornis (H.A. Pilsbry& A.A. Olsson, 1945)
Anticlimax uniformis F. Rubio & E. Rolán, 2014
Scrupus uniliratus A.W.B. Powell, 1931
Tornus unisulcatus (G.W. Chaster, 1896)