Chlamys sokolovi (FOSSIL) Kluschnikov, 1958 †
Amusium sol (FOSSIL) J. Brown & H.A. Pilsbry,1913 †
Chlamys solarioides (FOSSIL) (A. Heilprin, 1887 †)
Pecten solarium (FOSSIL) (J.B.P.A. Lamarck,1819 †)
Carolinapecten solaroides (FOSSIL) (A. Heilprin, 1887 †)
Chlamys solea (FOSSIL) G.P. Deshayes, 1824 †
Hilberia sollingensis (FOSSIL) (A. von Koenen, 1868 †)
Euvola soror (FOSSIL) (W.M. Gabb, 1873 †)
Radulonectites sosneadoensis (FOSSIL) (C.S. Weaver, 1931 †)
Excellichlamys sowerbyi H.H. Dijkstra, 1998
Karnekampia sp (FOSSIL) (Munster in Goldfuss 1833) †,
Pecten spathulatus (FOSSIL) Rouillier, 1846 †
Gloripallium speciosum (L.A. Reeve, 1853)
Excellichlamys spectabilis (L.A. Reeve, 1853)
Amusium spendulum (FOSSIL) W.P. Woodring, 1928 †
Gloripallium spiniferum (G.B. I Sowerby, 1835)
Chlamys splendens (FOSSIL) G.F. Dollfus, 1863 †
Mimachlamys splendidula (G.B. Sowerby, 1842)
Eopecten spondyloides (FOSSIL) (Roemer, 1836) †
Pedum spondyloideum (J.F. Gmelin, 1791)
Scaeochlamys squamata (J.F. Gmelin, 1791)
Scaeochlamys squamea H.H. Dijkstra& P. Maestrati, 2009
Serripecten squamocostatus (FOSSIL) A.G. Beu & T.A. Darragh,2001 †
Laevichlamys squamosa (J.F. Gmelin, 1791)
Laevichlamys squamosa larvata (L.A. Reeve, 1853)
Laevichlamys squamosa serrata (G.B. Sowerby, 1842)
Pecten squamula (FOSSIL) J.B.P.A. Lamarck, 1806 †
Notochlamys squamundata (FOSSIL) A.G. Beu & T.A. Darragh,2001 †
Chlamys stantoni (FOSSIL) J. Hill, 1893 †
Chlamys stantoni quitmanensis (FOSSIL) Stanton †
Chlamys stapfi (FOSSIL) Neuffer, 1973 †
Pecten stearnsii (FOSSIL) W.H. Dall, 1878 †
Hilberia stettinensis (FOSSIL) (von Koenen 1868) †
Pecten stewartianus Lundgren, 1895
Leopecten stillmani (H.H. Dijkstra, 1998)