Kaala subrutila (J.W. Mighels, 1845)
Euconulus subtecta W. Polinski, 1929
Euconulus subtilissimus (A.A. Gould, 1846)
Mendana subvenosa (C.M.F. Ancey, 1887)
Mendana tais (L. Pfeiffer, 1849)
Microcystis tangens E. Fischer-Piette, F. Blanc& F. Salvat, 1975
Liardetia tenuisculpta Unknown
Diastole tenuistriata R.C. Preece, 1995
Euconulus thaanumi C.M.F. Ancey, 1904
Euconulus thurstoni H.B. Baker, 1941
Greenwoodoconcha tomi H.B. Preston, 1913
Habroconus trochulinus (P.M.A. Morelet, 1851)
Coneuplecta trochulus (O.W.H. Reinhardt, 1883)
Habroconus truchulinus (P.M.A. Morelet, 1849)
Microcystis tsara K.C. Emberton& R.J. Griffiths, 2009
Philonesia turgida (C.M.F. Ancey, 1890)
Coneuplecta turrita H.A. Pilsbry & Y. Hirase,1905
Coneuplecta ultima Y. Hirase, 1908
Tengchiena umbraculorum (J.C. Cox, 1864)
Pseudoguppya utillensis (C.M.F. Ancey, 1886)
Guppya vaccus (O.A.L. Mörch, 1850)
Hiona verticillata (W.H. Pease, 1868)
Microcystis viaregina K.C. Emberton, 1994
Liardetia viridula (O.F. von Möllendorff,1897)
Microcystis vohimenae K.C. Emberton & T.A. Pearce,2000
Microcystis vony K.C. Emberton, 2010
Hiona wahiawae H.B. Baker, 1940
Philonesia waiheensis H.B. Baker, 1940
Philonesia waimanaloi H.B. Baker, 1940
Hiona waimanoi H.B. Baker, 1940
Philonesia welchi H.B. Baker, 1940
Palaua wilsoni (C.G. Semper)
Liardetia yaeyamensis (H.A. Pilsbry, 1901)
Discoconulus yakuensis H.A. Pilsbry, 1902
Ernstia zeteki H.A. Pilsbry, 1930