Planorbarius mantelli (FOSSIL) (R.W. Dunker, 1848 †)
Planorbarius margoi (FOSSIL) (Lörenthey, 1894 †)
Anisus mariae (FOSSIL) (A. Michaud, 1862 †)
Gyraulus marinkovici (Š. Brusina, 1892)
Helisoma marshalli H.B. Baker, 1945
Anisus matheroni (Fischer & J.R. Tournouër,1873)
Gyraulus matraensis Gál & al., 1999
Gyraulus mauritianus P.M.A. Morelet, 1876
Ferrissia mcneili B. Walker, 1925
Gundlachia meehiana W. Stimpson, 1863
Hebetancylus megaptera (A.E. Verrill, 1885)
Gyraulus meierbrooki P. Glöer & V.M. Pešic,2007
Planorbis mendipensis (FOSSIL) Moore †
Physopsis meneliki J.R. Bourguignat, 1885
Hippeutis meniscoides R. Tate, 1882
Gyraulus meridionalis J.W. Brazier, 1875
Planorbis metidjensis J.R. Bourguignat, 1880
Anisus metochiensis (FOSSIL) Miloševic, 1976 †
Gyraulus micromphalus (A. Fuchs, 1870 )
Bathyomphalus microstatus (J.R. Bourguignat, 1881)
Choanomphalus microtrochus W.A. Lindholm, 1909
Gyraulus mienanus D.S. Brown, 1998
Ancylus milleri W.L.H. Dohrn, 1869
Helisoma minus (J.G. Cooper, 1870)
Anisus minusculus I.M. Moskvichevain Dworiadkin, 1980
Anomphalodes minutus (FOSSIL) A.W. Grabau, 1936 †
Gyraulus minutus (F.M. Hilgendorf, 1867 )
Africanogyrus misellus (P.M.A. Morelet, 1868)
Ferrissia modesta (J.C.H. Crosse, 1880)
Bathyomphalus moedlingensis (FOSSIL) (Sauerzopf, 1953 †)
Segmentina molytes (C.A. Westerlund, 1885)
Taphius montanus (A.V.M.D. D'Orbigny,1835)
Taphius montanus bakeri (A.V.M.D. D'Orbigny,1835)
Taphius montanus concatenatus (A.V.M.D. D'Orbigny,1835)
Taphius montanus heteropleurus H.A. Pilsbry & E.G. Vanatta,