Gryphaea colombiana (FOSSIL) Clark & J.W. Durham,1946 †
Amphidonte columba (FOSSIL) (J.B.P.A. Lamarck,1819 †)
Exogyra columbella (FOSSIL) F.B. Meek, 1876 †
Amphidonte conica (FOSSIL) (J. de C. Sowerby,1813 †)
Exogyra contorta (FOSSIL) K.E.I. von Eichwald,1868 †
Gryphaea convexa (FOSSIL) T. Say †
Gryphaea corrugata (FOSSIL) T. Say, 1898 †
Gryphaea corrugata belviderensis (FOSSIL) J. Hill & Vaughan 1898 †
Gryphaea corrugata tucumcarii (FOSSIL) (Marcou, 1851 †)
Exogyra costata (FOSSIL) T. Say, 1820 †
Pycnodonte costei (FOSSIL) Coquand, 1869 †
Gryphaea costellata (FOSSIL) (J.H.F. Douvillé, 1916 †)
Circunula cotyledon (FOSSIL) (Contejean, 1859 †)
Exogyra couloni (FOSSIL) J.L.M. Defrance, 1821 †
Nanogyra crassa (FOSSIL) (Smith, 1819 †)
Catinula crickleyensis (FOSSIL) Cox, 1946 †
Gryphaea cygnoides (FOSSIL) Whidborne †
Pycnodonte cymbiola (FOSSIL) (G.P. Deshayes, 1832 †)
Gryphaea cymbium (FOSSIL) J.B.P.A. Lamarck, 1819 †
Exogyra davidsoni (FOSSIL) Whidborne, 1883 †
Amphidonte decussata (FOSSIL) G.A. Goldfuss, 1834 †
Pycnodonte defrancii (FOSSIL) (G.P. Deshayes, 1832 †)
Gyrostrea delettrei (FOSSIL) (Coquand, 1862. †)
Gryphaea dilatata (FOSSIL) J. de C. Sowerby, 1818 †
Exogyra drakei (FOSSIL) Cragin, 1893 †
Gryphaea dumortieri (FOSSIL) Joly, 1907 †
Gryphaeostrea elderi (FOSSIL) Kirkland, 1996 †
Crenostrea eldridgei (FOSSIL) (R. Arnold, 1907 †)
Exogyra erraticostata (FOSSIL) L.W. Stephenson, 1914 †
Gryphaeostrea eversa (FOSSIL) (Melleville, 1843 †)
Deltoideum expansa (FOSSIL) (Sowerby, 1832 †)
Exogyra fimbriata (FOSSIL) T.A. Conrad, 1855 †
Ceratostreon flabellatum (FOSSIL) (G.A. Goldfuss, 1833 †)
Ceratostreon fragilis (FOSSIL) Bogdanova 1980 †
Exogyra galeata (FOSSIL) Romanovsky †