Succinea tingitana P.M. Pallary, 1898
Oxyloma tkinoshitai J.T. Kuroda & S. Emura,1957
Neoxyloma tlapamensis (H.A. Pilsbry, 1899)
Succinea totteniana I. Lea
Catinella tuberculata C.M. Cooke, 1921
Lithotis tumida W.T. Blanford
Succinea undulata T. Say, 1829
Omalonyx unguis (A.V.M.D. D'Orbigny,1837)
Succinea unicolor G.W. Tryon, 1866
Succinea urbana L.R. Hubricht, 1961
Succinea utowana W.J. Clench
Succinea vaginacontorta Y.C. Lee, 1951
Succinea vatheleti H.A. Pilsbry, 1901
Succinea venusta A.A. Gould, 1846
Oxyloma verrilli (T.B. Bland, 1865)
Succinea vesicalis A.A. Gould, 1846
Succinea virgata E.C. Von Martens, 1865
Catinella waccamawensis D.S. Franzen, 1981
Succinea waianaensis C.M.F. Ancey, 1899
Catinella wandae G.R. Webb, 1953
Succinea wilsonii I. Lea, 1864
Quickia wollastoni (W.L.H. Dohrn, 1869)