Labyrinthus magdalenensis G.A. Solem, 1966
Xanthomelon magnidicum (T. Iredale, 1938)
Discoconcha majuscula (L. Pfeiffer, 1856)
Papuina malantanensis A. Adams & G.F. Angas,1876
Chloritis malayana (O.F. von Möllendorff,1887)
Chloritis malbatensis (J.G. Hidalgo, 1890)
Camaena mamilla (A.E.J. Férussac, 1821)
Camaena mamilla crassiventris B. Rensch, 1933
Mandarina mandarina (G.B. I Sowerby, 1839)
Semotrachia mannensis T. Iredale, 1937
Chloritis mansonensis (G.P.L.K. Gude, 1906)
Ventopelita mansueta (L.A. Reeve, 1854)
Camaena mansuyi P. Dautzenberg & H. Fischer,1906
Camaena mansuyi depressa P. Dautzenberg & H. Fischer,1906
Labyrinthus manueli H.C. Higgins, 1872
Galadistes marcescens (J.C. Cox, 1868)
Cupedora marcidum (C. Hedley, 1912)
Succochlea maretensis F. Criscione & F. Köhler,2014
Obba marginata (O.F. Müller, 1774)
Amphidromus mariae Thach & F. Huber, 2017
Amphidromus mariasendersae Thach & F. Huber, 2017
Amphidromus marieabbasae Thach, 2017
Chloritis marimberti A.R.J.B. Bavay& P. Dautzenberg, 1900
Chloritis marimberti carinata A.R.J.B. Bavay& P. Dautzenberg, 1909
Labyrinthus marmatensis H.A. Pilsbry, 1910
Badistes marshalli A. McLauchlan, 1951
Sinumelon marshalli T. Iredale, 1938
Amphidromus martensi O. Böttger, 1894
Ganesella martini (FOSSIL) C.H. Oostingh, 1935 †
Amphidromus masoni (H.H. Godwin-Austen,1876)
Camaena massiei (L.J. Morlet, 1891)
Badistes mastersi J.C. Cox, 1864
Figuladra mattea (T. Iredale, 1933)
Cooperconcha mawsoni (T. Iredale, 1937)
Noctepuna mayana (C. Hedley, 1899)