Dosinia stabilis (T. Iredale, 1929)
Leukoma staminea (T.A. Conrad, 1837)
Grateloupia staminea (FOSSIL) C. des Moulins 1828 †
Macrocallista stantoni (FOSSIL) Waring, 1917 †
Tivela stefaninii (S. Nardini, 1933)
Costacallista steinekei (FOSSIL) Clark & J.W. Durham,1946 †
Compsomyax stewarti (FOSSIL) Clark & J.W. Durham,1946 †
Dosiniopsis stewartvillensis (FOSSIL) Clark & Woodford, 1927 †
Mercenaria stimpsoni (FOSSIL) G.P. Deshayes, 1863 †
Mercenaria stimpsoni (A.A. Gould, 1861)
Transennella stimpsoni W.H. Dall, 1902
Sunetta stoffelsi (FOSSIL) (Nyst 1843) †
Meretrix striata J.E. Gray
Pleiorytis striata (FOSSIL) (T.A. Conrad, 1833 †)
Pullastra striatocostata (FOSSIL) F. McCoy, 1847 †
Eurhomalea striatolamellata (FOSSIL) (H.F.A. von Ihering,1897 †)
Chamelea striatula (E.M. Da Costa, 1778)
Venerella striatula (FOSSIL) (G.P. Deshayes, 1825 †)
Venerella striatula subglobosa (FOSSIL) (A.V.M.D. D'Orbigny,1850 †)
Pitar striatus (J.E. Gray, 1838)
Globivenus strigillina (W.H. Dall, 1902)
Circomphalus strigillinus W.H. Dall, 1902
Tivela stultorum (J. Mawe, 1823)
Austrovenus stutchburyi (W. Wood, 1828)
Dosinia subalata E.A. Smith, 1916
Meretrix subanaloga (FOSSIL) (Dufour, 1881 †)
Nitidavenus subarata (FOSSIL) (Sandberger 1861) †
Pitar subarestus W.H. Dall, 1912
Rhabdopitaria subcrassa (FOSSIL) K.V.W. Palmer, 1927 †
Compsomyax subdiaphana (Carpenter, 1864)
Cooperella subdiaphana (P.P. Carpenter, 1864)
Costacallista suberycinoides (FOSSIL) (G.P. Deshayes, 1825 †)
Chione subexentrica (FOSSIL) (Orbigny, 1852 †)
Meretrix subheberti (FOSSIL) (Dufour, 1881 †)
Chione subimbricata Sowerby, 1835