Mercuria meridionalis (A. Risso, 1826) France
Pyrgulopsis merriami H.A. Pilsbry& C.E. Beecher, 1892 Nevada, Lincoln County
Austropyrgus mersus A. Clark, W.B. Miller& W.F. Ponder, 2003 Tasmania
Beddomeia mesibovi W.F. Ponder & K.B. Clark,1993 Tasmania, Lake Chisolm
Pseudamnicola messapica (FOSSIL) D. Esu & O. Girotti,2010 † Italy, Otranto
Pyrgulopsis metcalfi D.W. Taylor, 1987 USA, Texas
Hydrobia metochiana (FOSSIL) P.S. Pavlovic, 1932 †
Micromelania metochiana (FOSSIL) Miloševic, 1971 †
Kuschelita mica F.M. Climo, 1974 New Zealand
Cincinnatia mica F.G. Thompson, 1968 Florida
Pseudotryonia mica R. Hershler, H.X. Liu& J.J. Landye, 2011 Alabama
Lobogenes michaelis H.A. Pilsbry& C.E. Beecher, 1927 Congo, Pointe Noire
Bythiospeum michaelleae H. Girardi, 2002
Bythiospeum michaudi (É.A.A. Locard, 1882) France
Phreatodrobia micra (H.A. Pilsbry& J.H. Ferriss, 1906) USA, Texas
Reesidella micra (FOSSIL) Pan, 1977 † China, Yunnan, Chuxiong Yi
Saxurinator microbeliscus H. Schütt, 1968 Croatia, Parenzo
Pyrgulopsis micrococcus (H.A. Pilsbry, 1893) Nevada, Nye County
Alzoniella microstoma M. Bodon& S. Cianfanelli, 2002 Italy, Fiume Magra
Socenia microtesta (FOSSIL) (Papp, 1954 †)
Islamia mienisi (H. Schütt, 1991) Israel, Gulf of Aqaba
Euxinipyrgula milachevitchi (A.N. Golikov& Y.I. Starobogatov, 1966) Azov Sea
Ohrigocea miladinovorum S. Hadžišce, 1959 Macedonia
Caspia milae H.D. Boeters, P. Glöer& D.G. Georgiev, 2015 Bulgaria
Goniochilus milicevici (FOSSIL) (P.S. Pavlovic, 1927 †)
Pyrgulopsis militaris R. Hershler, 1998 Nevada, Humboldt County
Pyrgulopsis millenaria R. Hershler, 1998 Nevada, Elko County
Victodrobia millerae W.F. Ponder & K.B. Clark,1993 Australia, Gippsland
Pyrgulopsis milleri R. Hershler & H.P. Liu,2010 California, Tulare County
Belgrandiella mimula M. Haase, 1996 Austria
Petterdiana minima (W.F. Petterd, 1889) Australia
Pseudamnicola minima (FOSSIL) (Lörenthey, 1893 †)
Micromelania minima (FOSSIL) P.S. Pavlovic, 1927 †
Pauluccinella minima (M. Paulucci, 1881) Italy, Lazio
Pyrgulopsis minkleyi (D.W. Taylor, 1966) Mexico, Saltillo