Eucalodium mexicanum (L. Pfeiffer, 1860) Oaxaca, Mexico
Microceramus mexicanus (E.C. Von Martens, 1897) Florida, Key Largo7 mm
Gongylostoma michaeli C. de la Torre& P. Bartsch, 1972 Cuba
Macroceramus microdon (L. Pfeiffer, 1853) Puerto Rico
Coelostemma microstoma (L. Pfeiffer, 1861) Mexico
Millerspira milleri (L.H. Gilbertson, 1989) Mexico, Sonora
Holospira millestriata H.A. Pilsbry& J.H. Ferriss, 1915 USA, Arizona11,5 mm
Torrecoptis minaensis C. de la Torre& P. Bartsch, 1972 Cuba
Liocallonia minaensis C. de la Torre& P. Bartsch, 1972 Cuba
Tetrentodon minasensis (C. de la Torre, 1929) Cuba12 mm
Allocoryphe minima (E.C. Von Martens, 1897) Mexico, Sonora
Microceramus minor (R. Arango in L. Pfeiffer, 1866) Cuba
Brachypodella minuta (J. Gundlach in L. Pfeiffer, 1859) Cuba
Hendersoniella miquihuanae F.G. Thompson& L.R. Correa-Sandoval, 2011 Mexico, Tamaulipas
Tetrentodon miraderoensis C. de la Torre& P. Bartsch, 1972 Cuba
Planostemma miranda (H.A. Pilsbry, 1929) Cuba
Holospira mitraensis P. Bartsch, 1926 Mexico, Nuevo León
Cochlodinella mixta (B.H. Wright in L. Pfeiffer, 1865) Cuba
Tetrentodon mochensis C. de la Torre& P. Bartsch, 1972 Cuba
Tetrentodon modesta (F. Poey, 1858) Cuba10 mm
Microceramus modestus C. de la Torre& P. Bartsch, 2008 Cuba
Brachypodella modica C. de la Torre& P. Bartsch, 1972 Cuba
Badiofaux mogotensis C. de la Torre& P. Bartsch, 1972 Cuba
Urocoptis mollita H.A. Pilsbry Cuba18 mm
Holospira monclovana P. Bartsch, 1925 Mexico, Saltillo
Badiofaux monelasmus (H.A. Pilsbry, 1928) Cuba
Autocoptis monilifera (L. Pfeiffer, 1850) Haiti
Tetrentodon montanensis C. de la Torre& P. Bartsch, 1972 Cuba
Tetrentodon montecristensis C. de la Torre& P. Bartsch, 1972 Dominican Republic
Holospira montivaga H.A. Pilsbry, 1946 USA, Guadalupe Mountains
Cochlodinella monzarillensis C. de la Torre& P. Bartsch, 1972 Cuba
Pfeiffericoptis moralesi (J. Gundlach in R. Arango, 1876) Cuba11 mm
Heterocoptis morenoi C. de la Torre& P. Bartsch, 1972 Cuba
Brachypodella morini (P.M.A. Morelet, 1849) Chiapas12 mm
Nesocoptis mortei C. de la Torre& P. Bartsch, 1972 Cuba