Nannamoria lundeliusae (FOSSIL) N.H. Ludbrook, 1978 †
Alcithoe lutea (R.B. Watson, 1882)
Athleta lutosa (H.J. Koch, 1948)
Athleta lutosa emmanuelae (J. Rosso, 1985)
Athleta lyra (FOSSIL) (J.B.P.A. Lamarck,1802 †)
Lyria lyraeformis (W.J. Swainson, 1821)
Amoria macandrewi (G.B. III Sowerby, 1887)
Notopeplum maccoyi (FOSSIL) (Tenison Woods, 1877 †)
Cymbiola macdonaldi (FOSSIL) R. Tate, 1889 †
Scaphella macginnorum E.F. Garcia & W.K. Emerson,1987
Voluta macroptera (FOSSIL) F. McCoy, 1874 †
Amoria maculata (W.J. Swainson, 1822)
Amoria maculata caroli (T. Iredale, 1924)
Amoria maculata volva (J.F. Gmelin, 1791)
Lyria madrakahensis (FOSSIL) M. Harzhauser, 2007 †
Odontocymbiola magellanica (J.F. Gmelin, 1791)
Odontocymbiola magellanica canigiai J. Vazquez & C.H. Caldini,1992
Odontocymbiola magellanica subnodosa (W.E. Leach, 1814)
Athleta magister (R.N. Kilburn, 1978)
Cymbiola magnifica (J.J. Gebauer, 1802)
Cymbiola magnifica altispira A. Maybloom, 1951
Cymbiola malayensis H. Douté, 1985
Lyria mallicki H.S. Ladd, 1975
Lyria mallicki dondani M. Angioy & G. Biraghi,1982
Lyria mallicki jessicae P. Bail & G.T. Poppe,2004
Lyria mallicki vicdani S. Kosuge, 1981
Livonia mammilla (G.B. I Sowerby, 1844)
Pseudaulicina mammosa (FOSSIL) (J.L.M. Defrance, 1829 †)
Peruluta mancorensis (FOSSIL) A.A. Olsson, 1928 †
Indolyria maniyaraensis (FOSSIL) M. Harzhauser & al.,2009 †
Scaphella mansfieldi (FOSSIL) E.J. Petuch, 1994 †
Lyria mansfieldi (FOSSIL) W.H. Dall, 1916 †
Mauira maoriana (FOSSIL) (H.H. Suter, 1917 †)
Athleta mariae (FOSSIL) Briart & Cornet, 1887 †
Cymbiola mariaemma J.E. Gray, 1858