Dosinia lupina lincta (R. Pulteney, 1799)
Meretrix lusoria (P.F. Röding, 1798)
Venus lyra S.C.T. Hanley, 1845
Meretrix lyrata (G.B. II Sowerby, 1851)
Lioconcha macaulayi K.L. Lamprell & J.M. Healy,2002
Kuia macdowelli (FOSSIL) J. Marwick, 1927 †
Dosinia mackayi (FOSSIL) J. Marwick, 1927 †
Marama mackenziei (FOSSIL) J. Marwick, 1927 †
Irus macrophyllus (G.P. Deshayes, 1853)
Dosinia macroptera (FOSSIL) C.A. Fleming, 1943 †
Dosina mactracea (W.J. Broderip, 1835)
Tivela mactroides (I. von Born, 1778)
Panchione mactropsis (FOSSIL) (T.A. Conrad, 1865 †)
Callista maculata (C. Linnaeus, 1758)
Costellipitar madecassinus (E. Fischer-Piette& D. Delmas, 1967)
Asaphinoides madreporicus (F.P. Jousseaume, 1895)
Goshoraia maedai (FOSSIL) Komatsu, 2013 †
Dosinia maeotica (FOSSIL) N.I. Andrusov †
Globivenus magdalenae (W.H. Dall, 1902)
Cyclina magna (FOSSIL) B. Wade, 1926 †
Dosinia magna (FOSSIL) F.W. Hutton, 1873 †
Antigona magnifica (S.C.T. Hanley, 1845)
Callista makoensis (FOSSIL) J. Marwick 1931 †
Paphia malabarica (J.H. Chemnitz, 1782)
Dosinia malecocta E. Fischer-Piette& D. Delmas, 1967
Chionopsis manabia (FOSSIL) H.A. Pilsbry& A.A. Olsson, 1941 †
Costacallista mancorensis (FOSSIL) A.A. Olsson, 1931 †
Pitar mancorensis (FOSSIL) (A.A. Olsson, 1931 †)
Costellipitar manillae (G.B. II Sowerby, 1851)
Dosinia maoriana (W.R.B. Oliver, 1923)
Gomphina maorum E.A. Smith, 1902
Mysia marchali R. von Cosel, 1995
Leukoma marcottae (FOSSIL) A.A. Olsson & R.E. Petit,1964 †
Pitar marensis (FOSSIL) (Weisbord 1964) †
Timoclea marginata (FOSSIL) (R. Hoernes, 1852 †)