Chondropoma marmoreum G.T. Watters & G. Duffy,2010
Ligatella marojeziana E. Fischer-Piette, Ch.P. Blanc, F. Blanc& F. Salvat, 1993
Rolleia martensi H. von Maltzan
Choanopoma martensianum (H.A. Pilsbry, 1900)
Cyclostoma martinii G.P. Deshayes, 1864
Tudorella mauretanica (P.M. Pallary, 1899)
Annularisca mayariensis C. de la Torre & P. Bartsch,1941
Annularisca mayensis C. de la Torre & P. Bartsch,1941
Opisthosiphon maynardi E.G. Vanatta, 1920
Opisthosiphon mayori P. Bartsch, 1946
Tudora megacheilus (V.L.V. Potiez& A. Michaud, 1838)
Tudora megacheilus desculpta H.B. Baker, 1924
Tudora megacheilus kabrietensis H.B. Baker, 1924
Abbottella mellosa G.T. Watters & G. Duffy,2010
Hendersonina mendax (C. de la Torre& P. Bartsch, 1938)
Cyclotopsis mermosi (E. Fischer-Piette, Ch.P. Blanc, F. Blanc& F. Salvat, 1993)
Cyclotopsis miaryi (E. Fischer-Piette, Ch.P. Blanc, F. Blanc& F. Salvat, 1993)
Tropidophora michaudi (J.P.S. Grateloup, 1840)
Tropidophora microchasma (L. Pfeiffer, 1856)
Abbottella milleacantha G.T. Watters & G. Duffy,2010.
Weinlandipoma milleri P. Bartsch, 1946
Cyclotopsis milloti E. Fischer-Piette, Ch.P. Blanc& D. Vukadinovic, 1974
Georgia milneedwardsi (J.R. Bourguignat, 1881)
Chondropoma mimetica (C. de la Torre& P. Bartsch, 1941)
Troschelvindex minia (J. Gundlach in F. Poey,1858)
Adamsiella mirabilis (W. Wood, 1828)
Adamsiella miranda (C.B. Adams, 1848)
Dioscopoma mirandae (E. Neubert, 2002)
Annularia mitis L. Pfeiffer, 1854
Platypoma modestum (S.A.A. Petit De La Saussaye, 1850)
Chondropoma moestum L. Pfeiffer
Pomatias moguntinus (FOSSIL) Kadolsky, 1989 †
Chondropoma molense P. Bartsch, 1946
Adamsiella monstrosa (C.B. Adams, 1849)
Cyclotopsis montana (L. Pfeiffer, 1855)