Lopha simplexa (FOSSIL) Zhang, 1977 †
Cubitostrea smithvillensis (FOSSIL) G.F. Harris, 1919 †
Ostrea soleniscus (FOSSIL) F.B. Meek, 1893 †
Crassostrea sparnacensis (FOSSIL) (J.L.M. Defrancein G.P. Deshayes, 1832 †)
Saccostrea spathulata (J.B.P.A. Lamarck, 1819)
Ostrea sphaeroidalis (FOSSIL) Whidborne †
Ostrea spolongensis (FOSSIL) Martin, 1916 †
Lopha staufferi (FOSSIL) Bergquist, 1944 †
Lopha stefaninii (FOSSIL) Diaz-Romero, 1931 †
Ostrea stentina B.C.M. Payraudeau, 1826
Ostrea stentina capsa G. Fischer von Waldheim,1807
Ostrea stentina isseli M.E.J. Bucquoy, P. Dautzenberg& G.F. Dollfus, 1889
Turkostrea strictiplicata (FOSSIL) (Raulin & Delbos 1855) †
Liostrea strigilecula (FOSSIL) (White, 1877 †)
Ostrea sturtiana (FOSSIL) R. Tate, 1886 †
Ostrea subangulata (FOSSIL) d'Orbigny, 1852 †
Crassostrea subangusta (FOSSIL) (A.V.M.D. D'Orbigny,1850 †)
Crassostrea subarcuata (FOSSIL) (G.P. Deshayes, 1832 †)
Ostrea subdigitalina (FOSSIL) A.A. Olsson & A. Harbison,1953 †
Ostrea subelongata (FOSSIL) Dufour, 1881 †
Ostrea submissa (FOSSIL) G.P. Deshayes, 1864 †
Lopha subovata (FOSSIL) Shumard, 1854 †
Liostrea subplana (FOSSIL) (Orbigny, 1850 †)
Crassostrea subpunctata (FOSSIL) (A.V.M.D. D'Orbigny,1850 †)
Ostrea subradiosa (FOSSIL) Bohm, 1926 †
Saccostrea subtrigona (G.B. II Sowerby, 1871)
Booneostrea subucula (F.P. Jousseaumein É. Lamy, 1925)
Ostrea sulcata J.B.P.A. Lamarck, 1811
Ostrea superficialis Forskål, 1775
Ostrea supranummulitica (FOSSIL) C.A. von Zittel, 1862 †
Flemingostrea suteri (FOSSIL) (H.F.A. von Ihering,1907 †)
Lopha syphax (FOSSIL) Coquand, 1854 †
Oscillopha syphax (FOSSIL) (Conquand 1854) †
Ostrea tacalensis (FOSSIL) F. Hodson & al., 1927 †
Talonostrea talonata X.Z. Li & Z. Qi, 1994