Agnocardia spinosifrons (FOSSIL) E.H. Vokes, 1984 † United States, Florida, Collier
Discors spondyloides (FOSSIL) (J. Von Hauer, 1847 †) Portugal, Algarve132 mm
Lymnocardium squamulosum (FOSSIL) G.P. Deshayes †
Pachycardium stantoni (FOSSIL) (B. Wade, 1926 †) Tennessee100 mm
Keenocardium starobogatovi (FOSSIL) A.I. Kafanov & Savizky,1982 † Russia, Moneron Island
Parvicardium straeleni (FOSSIL) (M. Glibert, 1945 †) Netherlands6 mm
Maoricardium strangi (FOSSIL) (C.R. Laws, 1930 †)
Protocardia striatula (FOSSIL) (Sowerby, 1829 †) Chile, Región Metropolitana de Santiago
Phlogocardia striatum (FOSSIL) (J. Brown& H.A. Pilsbry, 1911 †) Costa Rica51 mm
Protocardia stricklandi (FOSSIL) Morris & J. Lycett,1853 † China, Tanggula Mountains
Cardium strigilliferum (FOSSIL) Wood, 1840 † UK, England, Norfolk
Cardium subalternatum (FOSSIL) E.F. de Vogel, 1895 † Belgium, Wallonie, Liège
Vasticardium subassimile (E. Vidal, 2003) Indo-Pacific65,4 mm
Hedecardium subcordatum (FOSSIL) (H.H. Suter, 1917 †) New Zealand, Hawke's Bay, Central Hawke's Bay
Laevicardium subcostale (FOSSIL) (A. Petrov, 1982 †) Eastern Kamchatka
Pseudocatillus subdentatum (FOSSIL) (G.P. Deshayes, 1838 †)
Nemocardium subdiscors (FOSSIL) (A.V.M.D. D'Orbigny,1850 †) France, Paris Basin19 mm
Microfragum subfestivum (E. Vidal& L. Kirkendale, 2007) Philippines, Dinagat Island10,3 mm
Cardium subfragile (FOSSIL) A.V.M.D. D'Orbigny,1850 † France, Paris Basin86 mm
Nemocardium subfraterculus (FOSSIL) (Dufour, 1881 †) France, Brittany27 mm
Cardium subgratum (FOSSIL) Dufour, 1881 † France, Brittany32 mm
Cardium subguttiferum (FOSSIL) (D'Archiac, 1854 †) France, Aquitaine, Dordogne115 mm
Cardium subhispidum (FOSSIL) Hilber † Hungary, Börzsöny3 mm
Loxocardium sublima (FOSSIL) (A.V.M.D. D'Orbigny,1850 †) France, Paris Basin15 mm
Loxocardium sublimoides (FOSSIL) A.E.M. Cossmann, 1923 † France, Haute-Normandie, Eure
Pseudocatillus submedius (FOSSIL) A.M. Popov& Nevesskaja, 2000 †
Apiocardia subovalis (W.J. Broderip& Sowerby, 1829)
Cardium subpassyi (FOSSIL) Dufour, 1881 † France, Brittany25 mm
Pseudocatillus subpolemonis (FOSSIL) Ebersin, 1967 † Russia
Fulvia subquadrata E. Vidal & L. Kirkendale,2007 Philippines, Leyte Island6,8 mm
Protocardia subquadrata (FOSSIL) J. Evans & Shumard,1857 † Canada, Alberta, Division No. 1
Laevicardium substriatum (T.A. Conrad, 1837) USA, California20,5 mm
Laevicardium substriatum elenensis (G.B. II Sowerby, 1840) Costa Rica26 mm
Laevicardium subturgidum (FOSSIL) (A.V.M.D. D'Orbigny,1852 †) Belgium19 mm
Laevicardium subturgidum millasiense C.F. Fontannes, 1881 Italy, Tuscany10 mm