Eutheba microtricha (S.G.A. Jaeckel, 1954)
Xerosecta mideltiana (P.M. Pallary, 1920)
Jasonella mingrelica (P. Hesse, 1921)
Leptaxis minor W. Backhuys, 1975
Xerosecta mogadorensis (R.T. Lowe, 1860)
Xerosecta mogadorensis fusca P.M. Pallary, 1921
Xeroleuca moghrabina (P.M.A. Morelet, 1852)
Xeroleuca moghrabina privatiana (P.M. Pallary, 1918)
Pyrenaearia molae F. Haas, 1924
Amandana molinae (J.G. Hidalgo, 1883)
Xerosecta moluchaensis (P.M. Pallary, 1918)
Geomitra moniziana C.de Paiva, 1867
Odontotrema monodon A.A. Schileyko, 1988
Petasina monodon (A.E.J. Férussac, 1807)
Ponentina monoglandulosa D.T. Holyoak & G.A. Holyoak,2012
Trichia montana (S.E. Studer, 1820)
Amandana montserratensis (J.G. Hidalgo, 1870)
Amandana montserratensis betulonensis (A. Bofill, 1879)
Amandana moraguesi (W. Kobelt, 1883)
Faustella morenensis M. Seddon, 1990
Urticicola mounierensis (E. Caziot, 1909)
Urticicola moutonii (D. Dupuy, 1847)
Xerocrassa muehlfeldtiana (E.A. Rossmässler, 1837)
Xerosecta naini (P.M. Pallary, 1923)
Xeroleuca najae J. Ahuir Galindo, 2017
Candidula najerensis (A. Ortiz De Zárate,1950)
Fruticocampylaea narzanensis (I. Krynicki, 1833)
Fruticocampylaea narzanensis kobiensis (O. Böttger, 1883)
Pyrenaearia navasi (P. Fagot, 1907)
Metafruticicola naxiana (A.E.J. Férussac, 1832)
Cernuella neglecta (J.P.R. Draparnaud, 1805)
Monacha neudorfensis (FOSSIL) (Andreae, 1904) †
Xerocrassa nicosiana (E. Gittenberger, 1991)
Rothifruticicola nicosiana (A. Mousson, 1854)
Rothifruticicola nicosiana freytagi (H. von Maltzan, 1883)