Lioconcha sulcatina (J.B.P.A. Lamarck, 1818)
Pitar sulcatorius (FOSSIL) (G.P. Deshayes, 1825 †)
Atamarcia sulcifera (FOSSIL) J. Marwick, 1927 †
Paphia sulcosa (R.A. Philippi, 1847)
Pitar sulfureus H.A. Pilsbry, 1904
Atamarcia summersae (FOSSIL) (A.G. Beu, 1970 †)
Sunetta sunettina (F.P. Jousseaume, 1891)
Dosinia suteri (FOSSIL) J. Marwick, 1927 †
Protapes swenneni M. Huber, 2010
Larma taffi (FOSSIL) (Cragin 1893) †
Pitar tahitensis (R.A. Philippi, 1851)
Costellipitar taiwanensis (FOSSIL) (M. Yokoyama †)
Austrovenus tamakiensis (FOSSIL) (J. Marwick, 1948 †)
Periglypta tamiamensis (FOSSIL) A.A. Olsson & R.E. Petit,1964 †
Nutricola tantilla (A.A. Gould, 1853)
Callocardia tapina (FOSSIL) A.E.M. Cossmann, 1886 †
Periglypta tarquinia (FOSSIL) (W.H. Dall, 1900 †)
Paleomarcia tatei (FOSSIL) E.M. Fletcher, 1938 †
Pseudamiantis tauyensis (FOSSIL) (Yokoyama 1927) †
Dosinia tebblei E. Fischer-Piette& D. Delmas, 1967
Notocallista tecta (FOSSIL) J. Marwick, 1938 †
Chione tegulum (FOSSIL) Brouwn & H.A. Pilsbry,1911 †
Chionopsis tegulum (FOSSIL) (J. Brown & H.A. Pilsbry,1911 †)
Nitidavenus tejonensis (FOSSIL) (Waring, 1914 †)
Rupellaria tellimyalis (P.P. Carpenter, 1864)
Tivelina tellinaria (FOSSIL) J.B.P.A. Lamarck, 1906 †
Chionopsis temblorensis (FOSSIL) (Anderson, 1905 †)
Dosinia tenella A. Römer, 1860
Callithaca tenerrima (Carpenter, 1857)
Hyphantosoma tenue B.K. Raines & M. Huber,2012
Dosinia tenuilirata R.W. Dunker, 1865
Cyclinella tenuis (C.A. Récluz, 1852)
Cyclinella tenuis (FOSSIL) (Recluz, 1852 †)
Callistotapes tenuis (FOSSIL) (Deshayes) †
Periglypta tenuis (FOSSIL) (R. Tate, 1887 †)