Microsveltia metivieri A. Verhecken, 1997
Cancellaria metuloides (FOSSIL) A.A. Olsson, 1964 †
Cancellaria miamiensis (FOSSIL) E.J. Petuch, 1994 †
Massyla miccosukee (FOSSIL) E.J. Petuch, 1994 †
Microcancilla microscopica (W.H. Dall, 1889)
Admete microsoma (W.H. Dall, 1908)
Trigonostoma milleri J.Q. Burch, 1949
Loxotaphrus minbuensis (FOSSIL) G.F. Harris 1897 †
Pseudobabylonella minima (L.A. Reeve, 1856)
Zeadmete miocenica (FOSSIL) Finlay, 1930 †
Plesiotriton mirabilis A.G. Beu & P.A. Maxwell,1987
Hertleinia miranda (FOSSIL) P.O. Jung & R.E. Petit,1990 †
Agatrix mississippiensis (FOSSIL) (T.A. Conrad, 1848 †)
Trigonostoma mistense (FOSSIL) A.W. Janssen, 1984 †
Brocchinia mitraeformis (G.B. Brocchi, 1814 )
Brocchinia mitraeformis parvula (A.H.E. Beyrich, 1856 )
Hertleinia mitriformis (Sowerby, 1832)
Cancellaria mitrodita (FOSSIL) J. Gardner, 1937 †
Cancellaria mixta (FOSSIL) B.M. Landau & al., 2012 †
Neadmete modesta (P.P. Carpenter, 1864)
Cancellaria moharrami (FOSSIL) Abbass, 1972 †
Euclia montserratensis (FOSSIL) C.J. Maury, 1925 †
Bivetopsia moorei (FOSSIL) (R.J.L. Guppy, 1866 †)
Bivetopsia moorei pachia M. Smith, 1940
Trigonostoma mozambicense R.E. Petit& M.G. Harasewych, 2002
Unitas multienensis (FOSSIL) (L.J. Morlet, 1885 †)
Africotriton multinodulatus A.G. Beu & P.A. Maxwell,1987
Cancellaria multiplicis (FOSSIL) R.B. Newton, 1922 †
Admete murayamai (FOSSIL) (M. Yokoyama, 1926 †)
Neadmete nakayamai T. Habe, 1961
Sveltella nana (FOSSIL) (G.P. Deshayes, 1864 †)
Cancellaria nancellaria (FOSSIL) W.P. Woodring, 1970 †
Unitas nanggulanensis (FOSSIL) (K. Martin, 1914 †)
Unitas narica (FOSSIL) (E.W. Vredenburg, 1925 †)
Fusiaphera naroniformis (FOSSIL) (Finlay, 1930 †)