Haumea loxoides (G.B. III Sowerby, 1882) Hawaii, Oahu18 mm
Amusium lucens (FOSSIL) R. Tate, 1886 †
Nevadapecten lynnae (FOSSIL) T.R. Waller, 2005 † Nevada
Amusium lyonii (FOSSIL) W.M. Gabb, 1873 †
Aequipecten macfadyeni (FOSSIL) L.R. Cox, 1935 † Saudi Arabia
Nodipecten macloskeyi (FOSSIL) Anderson, 1929 † Colombia, Tuberá Mtn
Delectopecten macrocheiricola (T. Habe, 1951) Japan, Uraga Strait14 mm
Gloripallium maculosum (P. Forsskål in C. Niebuhr, 1775) Israel, Eilat39,6 mm
Chesapecten madisonius (FOSSIL) (T. Say, 1824 †) USA, Maryland
Coralichlamys madreporarum (G.B. II Sowerby, 1842) Philippines, Mactan Island21,9 mm
Placopecten magellanicus (J.F. Gmelin, 1791) Massachussetts128 mm
Nodipecten magnificus (Sowerby, 1835) Galapagos180 mm
Juxtamusium maldivense (Smith, 1903) Philippines, Cebu32 mm
Amusium manaricum E.A. Smith, 1906 India, Gulf of Manar
Mimachlamys mantelliana (FOSSIL) (Orbigny, 1847 †)
Zamorapecten maoensis (FOSSIL) Waller, 2011 † Dominican Republic, Monte Cristi
Euvola marensis (N.E. Weisbord, 1964) Guyana56 mm
Towaipecten mariae (FOSSIL) (Finlay, 1927 †)
Austrochlamys marisrossensis (FOSSIL) H.A. Jonkers, 2003 †
Euvola marshallae E.J. Petuch & R.F. Myers,2014 Florida Keys
Austrohinnites marwicki (FOSSIL) (R.S. Allan, 1946 †)
Phialopecten marwicki (FOSSIL) (A.G. Beu, 1970 †)
Serripecten marwicki (FOSSIL) P.A. Maxwell, 1992 † New Zealand, Canterbury, Waimate
Semipallium marybellae B.K. Raines, 1996 Thailand, Phuket41,1 mm
Placopecten marylandica (FOSSIL) (Wagner, 1839 †) United States, Maryland, Charles
Chlamys matchgarensis (FOSSIL) J. Makiyama, 1934 † Russia, Khabarovsk, Ul'chskiy rayon
Camptonectes matonabbei (FOSSIL) McLearn, 1933 † Canada, Alberta, Division No. 14
Mizuhopecten matschiense (FOSSIL) (Lautenschläger, 1964 †) Russia, Sakhalin
Miyagipecten matsumoriensis (FOSSIL) O. Masuda, 1952 † Japan, Fukushima
Mizuhopecten matumoriensis (FOSSIL) (A. Nakamura, 1940 †) Japan, Yamagata
Leoclunipecten mawsoni (FOSSIL) (E.M. Fletcher, 1938 †)
Pecten maxima (C. Linnaeus, 1758) Spain, Malaga104,7 mm
Pecten mclellani (FOSSIL) G.G. Gibson, 1987 † USA, North Carolina, Pamlico
Chlamys mediacostatus (FOSSIL) G.D. Hanna, 1926 † USA, California, Imperial
Mimachlamys meisensis (FOSSIL) (J. Makiyama, 1926 †) Japan, Akita, Akita