Alvania mediolittoralis S. Gofas, 1989
Cingula megalomastomus A.A. Olsson& J.T.L. McGinty, 1958
Rissoa melanostomoides F. Nordsieck& F.F. Talavera, 1979
Onoba melvilli (C. Hedley, 1916)
Rissoa membranacea (J. Adams, 1800)
Rissoa membranacea elata R.A. Philippi, 1844
Rissoa membranacea grossa A. Michaud, 1832
Rissoa membranacea hyalina Fréminville, 1814
Rissoa membranacea labiosa (G. Montagu, 1803)
Rissoa membranacea oblonga (A.G. Desmarest, 1814)
Attenuata merelina (R.K. Dell, 1956)
Onoba merelinoides H.W. Worsfold, G.J. Avern& W.F. Ponder, 1993
Alvania meridioamericana N.E. Weisbord, 1962
Setia messanensis T.A. de M. Monterosato,1884
Pusillina metivieri P. Bouchet & A. Warén,1993
Setia miae A. Verduin, 1988
Setia microbia H.J. Hoenselaar& H.J. Hoenselaar, 1991
Rissoa microcharia (FOSSIL) W.H. Dall, 1892 †
Alvania microglypta F. Haas, 1943
Powellisetia microlirata W.F. Ponder & H.W. Worsfold,1994
Alvania micropilosa S. Gofas, 2007
Lucidestea microscopica (K.H.J. Thiele, 1925)
Thierachella microstoma (FOSSIL) J.C. Fischer, 1969 †
Alvania microstriata H.J. Hoenselaar & J. Goud,1998
Powellisetia microstriata (R. Murdoch, 1905)
Alvania microtuberculata S. Gofas, 2007
Alvania mighelsi W. Stimpson, 1851
Onoba mighelsii (W. Stimpson, 1851)
Lucidestea milium (K.H.J. Thiele, 1925)
Onoba milleri (L. de Folin, 1871)
Pusillina minialba W. Segers, F. Swinnen& R. De Prins, 2009
Lucidestea minima (A. Adams, 1860)
Haurakia minuscula (A.W.B. Powell, 1955)
Alvania minuta (FOSSIL) H.J. Finlay, 1924 †
Punctulum minutum A.N. Golikov & Fedjakov,1987