Europicardium serrulatum (G.P. Deshayes, 1855)
Europicardium serrulatum kobelti (H. von Maltzan, 1885)
Nemocardium serum (FOSSIL) (F.W. Hutton, 1873 †)
Maoricardium setosum (J.H. Redfield, 1846)
Acrosterigma seurati E. Vidal, 1999
Vasticardium sewelli (B. Prashad, 1932)
Hedecardium sharpei (FOSSIL) (Archaic & Haime, 1854 †)
Afrocardium shepstonense J.R. le B. Tomlin, 1931
Ciliatocardium shinjiense (FOSSIL) (M. Yokoyama, 1923 †)
Serripes shiobaraensis (FOSSIL) H. Noda, 1962 †
Clinocardium shiobarense (FOSSIL) (M. Yokoyama, 1926 †)
Hypanis sidorovi (Y.I. Starobogatov, 1974)
Americardia silvacollina (FOSSIL) D.T. Dockery, 1982 †
Parvicardium simile (Milaschewisch, 1909)
Serripes similis (FOSSIL) A.I. Kafanov, 1994 †
Microcardium simillimum (E.A. Smith, 1896)
Acrosterigma simplex (L. Spengler, 1799)
Granocardium simplex (FOSSIL) J.H.F. Douvillé, 1916 †
Apiocardia simrothi (FOSSIL) (W.H. Dall, 1900 †)
Trachycardium sindiense (FOSSIL) E.W. Vredenburg, 1928 †
Vepricardium sinense (Sowerby, 1841)
Ciliatocardium smekhovi (FOSSIL) A.I. Kafanov & Savizky,1982 †
Cardium soldani (FOSSIL) Stoppani, 1863 †
Papyridea soleniformis (J.G. Bruguière, 1789)
Pseudocatillus solitarius (FOSSIL) (Papaianopol, 1992 †)
Protocardia somaliensis (FOSSIL) Cox, 1935 †
Vasticardium somnueki Hylleberg, 2015
Acrosterigma sorenseni (A.W.B. Powell, 1958)
Agnocardia sorrentoense (FOSSIL) (G.D. Hanna, 1927 †)
Maoricardium spatiosum (FOSSIL) (F.W. Hutton, 1873 †)
Americardia speciosa (A. Adams & L.A. Reeve,1850)
Protocardia sphaeroidea (FOSSIL) (E. Forbes, 1845 †)
Cardium spillmani (FOSSIL) T.A. Conrad, 1858 †
Acanthocardia spinosa (FOSSIL) (D.C. Solander, 1786 †)
Acanthocardia spinosa (J. Lightfoot, 1786)