Colpospira swainsiana (T.A. Garrard, 1982)
Stiracolpus symmetricus (F.W. Hutton, 1873)
Zeacolpus takapauensis (FOSSIL) J. Marwick, 1965 †
Turritella tampae (FOSSIL) A. Heilprin, 1887 †
Torquesia tamra (FOSSIL) Abbass, 1962 †
Zeacolpus taranakiensis (FOSSIL) J. Marwick, 1965 †
Ispharina tarturensis (FOSSIL) Awad & Abed, 1967 †
Gazameda tasmanica (L.A. Reeve, 1849)
Turritella taurinensis (FOSSIL) O.G. Michelotti, 1847 †
Mesalia taurocompressa (FOSSIL) F. Sacco, 1895 †
Turritella tauroperturritus (FOSSIL) F. Sacco, 1895 †
Orectospira tectiformis (R.B. Watson, 1880)
Turritella temblorensis (FOSSIL) L.W. Wiedey, 1928 †
Vermicularia tenuis (C. Rousseau in J.C. Chenu,1843)
Torquesia terebellata (FOSSIL) (J.B.P.A. Lamarck,1804 †)
Ispharina terebellata (FOSSIL) M. Glibert, 1962 †
Turritella terebra (C. Linnaeus, 1758)
Turritella terebra spectrum L.A. Reeve, 1849
Turritella terebralis (FOSSIL) J.B.P.A. Lamarck, 1799 †
Turritella terebralis fragilis (FOSSIL) J.P.S. Grateloup, 1840 †
Turritella terebralis grata (FOSSIL) A.E.M. Cossmann& M.A. Peyrot, 1921 †
Turritella terebriformis (FOSSIL) T.A. Conrad, 1863 †
Turritella terstriata (FOSSIL) B. Rogers & B. Rogers,1837 †
Turritella teschi (FOSSIL) Martin, 1916 †
Tropicolpus tetleyi (FOSSIL) (Powell & J.A. Bartrum,1929 †)
Turritella tipperi (FOSSIL) E.W. Vredenburg, 1928 †
Turritella tokodensis (FOSSIL) Strausz, 1966 †
Spirocolpus tophina (FOSSIL) J. Marwick, 1926 †
Vermicularia tortuosa (J. Lightfoot, 1786)
Turritella torulosa L.C. Kiener, 1843
Turritella totiumsanctorum (FOSSIL) C.J. Maury, 1930 †
Turritella touzini (FOSSIL) A.E.M. Cossmann& M.A. Peyrot, 1921 †
Colpospira translucida T.A. Garrard, 1972
Mesalia tricarinata (FOSSIL) Abbass, 1967 †
Turritella tricincta (FOSSIL) Münster, 1841 †