Haumea loxoides (G.B. III Sowerby, 1882)
Amusium lucens (FOSSIL) R. Tate, 1886 †
Nevadapecten lynnae (FOSSIL) T.R. Waller, 2005 †
Amusium lyonii (FOSSIL) W.M. Gabb, 1873 †
Aequipecten macfadyeni (FOSSIL) L.R. Cox, 1935 †
Nodipecten macloskeyi (FOSSIL) Anderson, 1929 †
Delectopecten macrocheiricola (T. Habe, 1951)
Gloripallium maculosum (P. Forsskål in C. Niebuhr,1775)
Chesapecten madisonius (FOSSIL) (T. Say, 1824 †)
Coralichlamys madreporarum (G.B. II Sowerby, 1842)
Placopecten magellanicus (J.F. Gmelin, 1791)
Nodipecten magnificus (Sowerby, 1835)
Juxtamusium maldivense (Smith, 1903)
Amusium manaricum E.A. Smith, 1906
Mimachlamys mantelliana (FOSSIL) (Orbigny, 1847 †)
Zamorapecten maoensis (FOSSIL) Waller, 2011 †
Euvola marensis (N.E. Weisbord, 1964)
Towaipecten mariae (FOSSIL) (Finlay, 1927 †)
Austrochlamys marisrossensis (FOSSIL) H.A. Jonkers, 2003 †
Euvola marshallae E.J. Petuch & R.F. Myers,2014
Austrohinnites marwicki (FOSSIL) (R.S. Allan, 1946 †)
Phialopecten marwicki (FOSSIL) (A.G. Beu, 1970 †)
Serripecten marwicki (FOSSIL) P.A. Maxwell, 1992 †
Semipallium marybellae B.K. Raines, 1996
Placopecten marylandica (FOSSIL) (Wagner, 1839 †)
Chlamys matchgarensis (FOSSIL) J. Makiyama, 1934 †
Camptonectes matonabbei (FOSSIL) McLearn, 1933 †
Mizuhopecten matschiense (FOSSIL) (Lautenschläger, 1964 †)
Miyagipecten matsumoriensis (FOSSIL) O. Masuda, 1952 †
Mizuhopecten matumoriensis (FOSSIL) (A. Nakamura, 1940 †)
Leoclunipecten mawsoni (FOSSIL) (E.M. Fletcher, 1938 †)
Pecten maxima (C. Linnaeus, 1758)
Pecten mclellani (FOSSIL) G.G. Gibson, 1987 †
Chlamys mediacostatus (FOSSIL) G.D. Hanna, 1926 †
Mimachlamys meisensis (FOSSIL) (J. Makiyama, 1926 †)