Alvania trachisma P. Bartsch, 1911
Onoba transenna (R.B. Watson, 1886)
Rissoa transitans F. Nordsieck, 1972
Crisilla transitoria S. Gofas, 1999
Setia triangularis (R.B. Watson, 1886)
Merelina tricarinata (A.W.B. Powell, 1937)
Cingula trifasciata (J. Adams, 1800)
Cingula trifasciata rupestris (E. Forbes, 1840)
Onoba tristanensis H.W. Worsfold, G.J. Avern& W.F. Ponder, 1993
Botryphallus tuber (E. Rolán, 1991)
Alvania tumida P.P. Carpenter, 1857
Obtusella tumidula (G.O. Sars, 1878)
Rissoa tunetana P.M. Pallary, 1912
Turboella turbinata (FOSSIL) (J.B.P.A. Lamarck,1804 †)
Rissoa turbinopsis (FOSSIL) G.P. Deshayes, 1861 †
Pseudosetia turgida (J.G. Jeffreys, 1870)
Alvania turkensis M.J. Faber& R.G. Moolenbeek, 2004
Cingula turoniensis (FOSSIL) M. Glibert, 1949 †
Onoba turqueti (É. Lamy, 1905)
Rissoa turricula (FOSSIL) K.E.I. von Eichwald,1853 †
Setia turriculata T.A. de M. Monterosato,1884
Pusillina turrita T.A. de M. Monterosato,1890
Setia ugesae A. Verduin, 1988
Voorwindia umbilicata W.F. Ponder, 1985
Rissoa undulata (FOSSIL) G.P. Deshayes, 1861 †
Powellisetia unicarinata (A.W.B. Powell, 1930)
Manzonia unifasciata Dautzemburg, 1889
Lironoba unilirata (J.E. Tenison-Woods,1878)
Rissoa unisulca (FOSSIL) Buvignier, 1843 †
Obtusella urdeneta (P. Bartsch, 1917)
Alvania urgonensis (FOSSIL) A.E.M. Cossmann, 1918 †
Cingula vaga (E.A. Smith, 1890)
Alvania valeriae R.S. Absalão, 1994
Setia valvatoides (K.O. Milaschewitsch,1909)
Gofasia vanderlandi P. Bouchet & A. Warén,1993