Leptinaria mamoreensis F.C. Baker, 1926
Subulina manampetsaensis E. Fischer-Piette& A.M. Testud, 1964
Tortaxis mandarinus (L. Pfeiffer, 1855)
Subulina manempetsaensis J. Germain, 1964
Homorus manueli H.B. Preston, 1910
Rhodea mariaalejandrae J. Grego, J. Steffek& A.P. Infante, 2007
Opeas mariae (F.P. Jousseaume)
Petriola marmorea (L.A. Reeve, 1850)
Lamellaxis martensi (L. Pfeiffer, 1856)
Lamellaxis martensiana (F.C. Baker, 1927)
Bocageia massoni (J.C.H. Crosse, 1868)
Tortaxis matudai Y. Hirase, 1941
Rumina maura (J.C.H. Crosse, 1873)
Allopeas mauritianum (L. Pfeiffer, 1852)
Allopeas mauritianum prestoni (E.R. Sykes, 1898)
Obeliscus maximus H.A. Pilsbry, 1906
Obeliscus maximus princeps H.A. Pilsbry, 1906
Chilonopsis melanoides T.V. Wollaston, 1878
Lamellaxis mexicanus (L. Pfeiffer, 1866)
Leptopeas micra (A.V.M.D. D'Orbigny,1835)
Opeas micrae (A.V.M.D. D'Orbigny,1835)
Obeliscus microstoma (J. Gundlachin L. Pfeiffer, 1863)
Opeas minutum (FOSSIL) (Klein, 1853) †
Xerocerastus minutus A. Zilch, 1939
Krapfiella mirabilis H.B. Preston, 1911
Tortaxis mirus (P.V. Gredler, 1884)
Lamellaxis mizius Er. Marcus & Ev. Marcus,1968
Lamellaxis monodon (C.B. Adams, 1849)
Bocageia monticola (J.R. Bourguignat, 1880)
Subulina moreleti (A.A.A. Girard, 1893)
Rhodea moussoni A. Greco & Steffer, 2007
Dysopeas muibum Er. Marcus & Ev. Marcus,1968
Glessula mullorum (W.T. Blanford, 1861)
Prosopeas muongbuensis V.T. Do, 2014
Curvella myrmecophila B. Verdcourt, 2002