Mimachlamys robinaldina (FOSSIL) (A.V.M.D. D'Orbigny,1847 †)
Neithea roemeri (FOSSIL) J. Hill, 1889 †
Chlamys rogersii (FOSSIL) T.A. Conrad, 1834 †
Chlamys rollei (FOSSIL) F. Stoliczka, 1861 †
Chlamys rosealbus (O.A. Scarlato, 1981)
Camptochlamys rosimon (FOSSIL) d'Orbigny, 1850 †
Serratovola rubicunda (C.A. Récluz, 1843)
Serratovola rubicunda aspera (G.B. Sowerby, 1842)
Serratovola rubicunda passerina (R.B. Hinds, 1845)
Chlamys rubida R.B. Hinds, 1845
Laevichlamys rubromaculata (G.B. II Sowerby, 1842)
Laevichlamys ruschenbergeri (G.W. Tryon, 1869)
Azumapecten ruschenbergerii (G.W. Tryon, 1869)
Radulopecten rushdenensis (FOSSIL) J. Lycett, 1863 †
Chlamys russata L.A. Reeve, 1853
Chlamys rutteni (FOSSIL) Martin, 1914 †
Chlamys sacyi (FOSSIL) A.E.M. Cossmann& M.A. Peyrot, 1921 †
Chlamys sanctiludovici (FOSSIL) Anderson & Martin, 1914 †
Camptonectes sandsfootensis (FOSSIL) Arkell W J †
Hunanonectes sanduensis (FOSSIL) Y. Fang, 1978 †
Mimachlamys sanguinea (C. Linnaeus, 1758)
Mimachlamys sanguinea porphyrea (C. Linnaeus, 1758)
Chlamys sanguinolenta (FOSSIL) (J.F. Gmelin, 1791 †)
Pecten sansebastianus (FOSSIL) C.J. Maury, 1920 †
Pecten santacruzensis (FOSSIL) R. Arnold, 1906 †
Chesapecten santamaria (FOSSIL) (Tucker, 1934 †)
Chlamys santamaria (FOSSIL) W.C. Mansfield, 1936 †
Pecten santarosanus (FOSSIL) Bose, 1905 †
Minnivola sapolwanaensis (FOSSIL) G.S. Carter, 1966 †
Pecten saskatchewanensis (FOSSIL) Warren, 1934 †
Chlamys satoi (FOSSIL) Yokoyama, 1928 †
Laevichlamys sauciata (J.F. Gmelin, 1791)
Chesapecten sayanus (FOSSIL) (W.H. Dall, 1898 †)
Chlamys scabrellus (FOSSIL) J.B.P.A. Lamarck, 1819 †
Mimachlamys scabricostata (Sowerby, 1915)