Microeulima terebralis (P.P. Carpenter, 1857)
Stilapex teremachii T. Habe, 1958
Hoplopteron terquemi P. Fischer, 1876
Melanella testacea (W.E. Leach, 1852)
Niso tetuakii T. Habe, 1949
Echineulima thaanumi (H.A. Pilsbry, 1921)
Fusceulima thalassae P. Bouchet & A. Warén,1986
Melanella thalia P. Bartsch, 1915
Melanella thersites (P.P. Carpenter, 1864)
Stilapex thielei (R. Sturany, 1903)
Paraglauconia thomasi (FOSSIL) Mennessier, 1984 †
Batheulima thurstoni P. Bouchet & A. Warén,1986
Pelseneeria thurstoni (R. Winckworth, 1936)
Melanella tia (P. Bartsch, 1926)
Curveulima titahica (H.H. Suter, 1908)
Leiostraca titania (A. Adams, 1861)
Vitreolina titubans S.S. Berry, 1956
Fusceulima toffee de Souza & A. Pimenta,2014
Echineulima toki (T. Habe, 1974)
Stilapex tokii (T. Habe, 1974)
Hypermastus tokunagai (FOSSIL) (M. Yokoyama, 1922 †)
Eulima tornata (K.H.J. Thiele, 1925)
Provermicularia torsa (FOSSIL) (Böhm, 1895 †)
Melanella tortuosa (A. Adams & L.A. Reeve,1850)
Pyramidelloides tosaensis (T. Habe, 1961)
Eulima townsendi (P. Bartsch, 1917)
Pelseneeria toxopneustesicola T. Habe, 1989
Melanella translucens (T.A. de M. Monterosato,1890)
Eulima translucida E.A. Smith, 1901
Eulima treadwelli (FOSSIL) F.W. Hutton, 1885 †
Niso tricolor W.H. Dall, 1889
Eulima triggi B.C. Cotton & F.C. Godfrey,1932
Mucronalia trilineata A. Warén, 1980
Niso trilineata O.A.L. Mörch, 1872
Pyramidelloides triliratus (L. de Folin, 1873)