Pseudoperna bentonense (FOSSIL) (Logan 1899) †
Ostrea berkeyi (FOSSIL) C.J. Maury, 1920 †
Crassostrea bilineata (P.F. Röding, 1798)
Liostrea birmanica (FOSSIL) Reed, 1936 †
Ostrea blackensis (FOSSIL) L.W. Stephenson, 1923 †
Lopha blanfordi (FOSSIL) Lees, 1928 †
Ostrea bomasensis (FOSSIL) Martin, 1916 †
Striostrea bourgeoisii (FOSSIL) (Rémond, 1863 †)
Ostrea brongniarti (FOSSIL) H.G. Bronn, 1856 †
Striostrea cahobasensis (FOSSIL) (H.A. Pilsbry & J. Brown,1910 †)
Ostrea californica Mareon, 1858
Cameleolopha cameleo (FOSSIL) (Coquand 1869) †
Ostrea carolinensis (FOSSIL) T.A. Conrad, 1832 †
Ostrea castellobrancoi (FOSSIL) C.J. Maury, 1936 †
Ostrea chilensis R.A. Philippi, 1844
Ostrea chilensis charlottae H.J. Finlay, 1928
Ostrea chilensis lutaria F.W. Hutton, 1873
Lopha chlamydoides (FOSSIL) Martin, 1922 †
Liostrea chulgunensis (FOSSIL) V.N. Sinelnikova, 1997 †
Striostrea circumpicta (H.A. Pilsbry, 1904)
Saccostrea circumsuta (A.A. Gould, 1850)
Alectryonia clotbeyi (FOSSIL) L.M.D. Bellardi, 1854 †
Ostrea collazica (FOSSIL) C.J. Maury, 1920 †
Crassostrea columbiensis (L.G. Hertlein, 1951)
Ostrea compressirostra (FOSSIL) T. Say, 1824 †
Ostrea conchaphila Carpenter, 1857
Pseudoperna congesta (FOSSIL) (T.A. Conrad, 1843 †)
Crassostrea contracta (FOSSIL) (T.A. Conrad, 1865 †)
Anomiostrea coralliophila T. Habe, 1975
Ostrea costaricensis (FOSSIL) A.A. Olsson, 1922 †
Lopha costata (FOSSIL) Sowerby, 1825 †
Ostrea coxei (FOSSIL) Author unknown †
Ostrea crenulimarginata (FOSSIL) W.M. Gabb, 1860 †
Flemingostrea cretacea (FOSSIL) (Morton, 1834 †)
Umbrostrea cristadifformis (FOSSIL) (Schlotheim) †