Oamaruia suteri (FOSSIL) (P. Marshall& R. Murdoch, 1920 †)
Unitas suturalis (FOSSIL) (G.B. I Sowerby, 1821 †)
Admete tabatai (FOSSIL) (M. Yokoyama, 1926 †)
Admete tabulata G.B. III Sowerby, 1875
Cancellaria tabulata (FOSSIL) J. Gardner & T.H. Aldrich,1919 †
Trigonostoma tampaensis (FOSSIL) R.E. Petit, 1967 †
Brocchinia tanimbarensis A. Verhecken, 1997
Cancellaria tapeina (FOSSIL) W.P. Woodring, 1970 †
Sydaphera tasmanica (J.E. Tenison-Woods,1876)
Brocchinia tauroparva (FOSSIL) F. Sacco, 1894 †
Pyruclia telemba (FOSSIL) A.A. Olsson, 1964 †
Trigonostoma tenerum (R.A. Philippi, 1848)
Turehua tenuispiralis (FOSSIL) A.G. Beu & P.A. Maxwell,1987 †
Admete tenuissima T.A. Okutani & K. Fujikura,2002
Nipponaphera teramachii (T. Habe, 1961)
Zeadmete teres (FOSSIL) (C.R. Laws, 1940 †)
Cancellaria terryi (FOSSIL) (Costa, 1778 †)
Massyla terryi (FOSSIL) A.A. Olsson, 1942 †
Trigonostoma tessella T.A. Garrard, 1975
Aphera tessellata (Sowerby, 1832)
Plesiotriton teuleraensis (FOSSIL) Lesport, Cluzaud& A. Verhecken, 2015 †
Scalptia textilis (L.C. Kiener, 1841)
Axelella thisbe (FOSSIL) (A.A. Olsson, 1964 †)
Cancellaria thomasiana J.C.H. Crosse, 1861
Loxotaphrus thorei (FOSSIL) (J.P.S. Grateloup,1845 †)
Trigonostoma thysthlon R.E. Petit& M.G. Harasewych, 1987
Trigonostoma tjibaliungense (FOSSIL) (K. Martin, 1895 †)
Trigonostoma toroense (FOSSIL) A.A. Olsson, 1922 †
Ventrilia toroensis (FOSSIL) A.A. Olsson, 1922 †
Cancellaria tortiplica (FOSSIL) T.A. Conrad, 1865 †
Cancellaria torula (FOSSIL) N.E. Weisbord, 1962 †
Mirandaphera tosaensis (T. Habe, 1961)
Massyla toulai (FOSSIL) B.M. Landau & al., 2012 †
Sveltia tournoueri (FOSSIL) M.A. Peyrot, 1928 †
Zeadmete trailli (F.W. Hutton, 1873)