Iberus marmoratus guiraoanus (L. Pfeiffer, 1853)
Iberus marmoratus intermedius (C.R. Böttger, 1913)
Iberus marmoratus loxanus (A. Schmidt, 1853)
Iberus marmoratus ortizi E. Garcia San Nicolás,1957
Iberus marmoratus rositai S .de Fez, 1950
Helix marmorivaga J.F. Mabille, 1889
Alabastrina marmouchana (P.M. Pallary, 1933)
Rossmaessleria marocana J. Galindo, 2017
Tingitana martinae T. Cossignani& J. Ahuir Galindo, 2012
Adiverticula mascaensis M.R. Alonso & C.M. Ibáñez,1988
Atlasica massesylica P.M. Pallary
Iberus massylaea (P.M.A. Morelet, 1851)
Helicigona matrella (C.A. Westerlund, 1898)
Agalactochilus mattiacus (FOSSIL) (Steininger, 1835) †
Hemicycla maugeana (R.J. Shuttleworth, 1852)
Erctella mazzullii (G.J. De Cristofori& G. Jan, 1832)
Helix melanostoma J.P.R. Draparnaud, 1801
Hemicycla melchori R. Vega-Luz, 2008
Murella melitensis (A.E.J. Férussac, 1821)
Helicigona melpomene P. Subai, 1996
Hemicycla merita (A. Mousson, 1872)
Helix mersinae W. Kobelt, 1896
Helix metula J.C.H. Crosse, 1870
Helix micromphalus R.T. Lowe, 1852
Helix mileti W. Kobelt, 1906
Chilostoma millieri J.R. Bourguignat, 1880
Tingitana minetti (P.M. Pallary, 1918)
Tingitana minetti decussata (P.M. Pallary, 1918)
Tingitana minetti umbilicata (P.M. Pallary, 1918)
Helix mingrelica A. Mousson, 1861
Hemicycla modesta (A.E.J. Férussac, 1821)
Josephinella moellendorffi (W. Kobelt, 1871)
Hemicycla montefortiana L.A. Beck & W. Rähle,2006
Palaeotachea moroguesi (FOSSIL) (Brongniart, 1810) †
Hemicycla moussoniana (T.V. Wollaston, 1878)