Acrosterigma mauritiana (G.P. Deshayes, 1855)
Cardium maxicostatum J.J. Ter Poorten, 2007
Americardia media (C. Linnaeus, 1758)
Clinocardium meekianum (FOSSIL) (W.M. Gabb, 1866 †)
Trigoniocardia melajoensis (FOSSIL) P.O. Jung, 1969 †
Laevicardium melvilli (FOSSIL) R.B. Newton, 1905 †
Vasticardium mendanaense (G.B. III Sowerby, 1897)
Keenocardium menneri (FOSSIL) A.I. Kafanov, 1984 †
Microcardium microtatum (FOSSIL) W.P. Woodring, 1982 †
Trachycardium minbuense (FOSSIL) Noetling, 1901 †
Vasticardium mindanense (L.A. Reeve, 1844)
Cardium minervae (FOSSIL) A.E.M. Cossmann& M.A. Peyrot, 1909 †
Parvicardium minimum (R.A. Philippi, 1836)
Globocardium minor (FOSSIL) Tashiro & Kozai 1988 †
Trigoniocardia minutissima (FOSSIL) F. Toula, 1911 †
Europicardium miorotundatum (FOSSIL) (F. Sacco, 1899 †)
Granocardium miyajiense (FOSSIL) Tashiro 1994 †
Pratulum modicum (FOSSIL) (J. Marwick, 1944 †)
Agnocardia mokattamensis (FOSSIL) Abbass, 1972 †
Trachycardium mollyni (FOSSIL) E.H. Vokes, 1982 †
Hedecardium moniletectum (FOSSIL) (R. Tate, 1887 †)
Corculum monstrosum (J.F. Gmelin, 1791)
Loxocardium montense (FOSSIL) (Vincent 1930) †
Ciliatocardium moorae (FOSSIL) A.I. Kafanov, 2002 †
Cardium moricinum (FOSSIL) de Loriol, 1866 †
Trifaricardium morrisoni J.J. Ter Poorten & M. Huber,2007
Laevicardium mortoni (T.A. Conrad, 1831)
Europicardium multicostatum (FOSSIL) (G.B. Brocchi, 1814 †)
Laevicardium multilineatum W.H. Dall & W. Stimpson,1901
Discors multipunctatum (G.B. I Sowerby, 1833)
Trachycardium multiradiatum (FOSSIL) (Sowerby, 1846 †)
Vepricardium multispinosum (Sowerby, 1838)
Loxocardium multisquamatum (FOSSIL) (G.P. Deshayes, 1858 †)
Trachycardium multistriatum (FOSSIL) (G.B. Brocchi, 1814 †)
Fragum mundum (L.A. Reeve, 1845)