Pseudamnicola margaritaeformis (FOSSIL) (N.I. Andrusov, 1905 †)
Pseudamnicola margaritula (FOSSIL) (A. Fuchs, 1870 †)
Belgrandia marginata (A. Michaud, 1831)
Pyrgula marginata (C.A. Westerlund, 1902)
Palacanthilhiopsis margritae H.D. Boeters & G. Falkner,2003
Alzoniella marianae B. Arconada, E. Rolán& H.D. Boeters, 2007
Caledoconcha mariapetrae M. Haase & P. Bouchet,1998
Belgrandia mariatheresiae F.L. Giusti & E. Pezzoli,1974
Pyrgulopsis marilynae R. Hershler, L. Ratcliffe& al., 2014
Andrusovia marina (B.M. Logvinenko& Y.I. Starobogatov, 1968)
Corrosella marisolae (D. Delicado, Machordom& M.A. Ramos, 2012)
Ecrobia maritima (K.O. Milaschewitsch,1916)
Hydrobia maroccana P.M. Pallary, 1921
Bythiospeum maroskoi P. Glöer & J. Grego, 2015
Turricaspia martensii (S. Clessin& W. Dybowski in W. Dybowski, 1888)
Pyrgula martini (FOSSIL) P.S. Pavlovic, 1932 †
Pyrgula marulici (FOSSIL) Š. Brusina, 1902 †
Catapyrgus matapango M. Haase, 2008
Pyrgula mathildaeformis (FOSSIL) A. Fuchs, 1870 †
Vinodolia matjasici (J. Bole, 1961)
Parhydrobia mayeri (FOSSIL) (Morgan, 1920 †)
Hauffenia media J. Bole, 1961
Sulawesidrobia megalodon S. Zielske, M. Glaubrecht& M. Haase, 2011
Fluviopupa mekeniyaqona M. Haase, W.F. Ponder& P. Bouchet, 2006
Fluviopupa mekewesi M. Haase, W.F. Ponder& P. Bouchet, 2006
Fluviopupa melissae M. Haase, Fontaine& O. Gargominy, 2010
Mercuria melitensis (Paladilhe, 1869)
Pseudamnicola meloussensis C.R. Altaba, 2007
Pseudamnicola meluzzii H.D. Boeters, 1976
Turricaspia meneghiniana (A. Issel, 1865)
Prososthenia meneghiniana (FOSSIL) (C. De Stefani, 1874 †)
Micromelania menisi (FOSSIL) Š. Brusina, 1902 †
Pseudamnicola meralae P. Glöer, M.E. Gürlek& C. Kara, 2014
Pseudamnicola merali P. Glöer, M.E. Gürlek& C. Kara, 2014
Bythiospeum meratensis E. Pezzoli, 2004