Obesula mamillata (J.C. Verco, 1909)
Metaxia maoria (H.J. Finlay, 1930)
Costatophora mapoonensis (C.F. Laseron, 1958)
Litharium marceda (C.F. Laseron, 1958)
Subulophora marginata C.F. Laseron, 1958
Marshallora mariangelae F. Fernandes & E. Rolán,1988
Inella mariei F.P. Jousseaume, 1884
Obesula marisnostri P. Bouchet, 1985
Triphora marmorata R.B. Hinds, 1843
Bouchetriphora marrowi B.A. Marshall, 1983
Triphora marshi A.M. Strong & L.G. Hertlein,1939
Triphora martii E. Rolán& R. Fernández-Garcés, 1995
Latitriphora maxillaris (R.B. Hinds, 1843)
Costatophora mcgilpi (B.C. Cotton, 1952)
Aclophoropsis mcmichaeli (S. Kosuge, 1962)
Triphora medinae J.J. Parodíz, 1955
Mastonia mediotincta (R.P.J. Hervier, 1898)
Variseila meeki (FOSSIL) (B. Wade, 1926 †)
Triphora melantera R.P.J. Hervier, 1898
Cosmotriphora melanura (C.B. Adams, 1850)
Coriophora mellita (C.F. Laseron, 1958)
Nanaphora melwardi C.F. Laseron, 1958
Metaxia merignacensis (FOSSIL) (A.E.M. Cossmann& M.A. Peyrot, 1922 †)
Metaxia metaxa (S. Delle Chiaje, 1828)
Metaxia metaxae (S. Delle Chiaje, 1826)
Triphora metcalfeii R.B. Hinds, 1843
Opimaphora metellona C.F. Laseron, 1958
Strobiligera meteora (W.H. Dall, 1927)
Inella micans (R.B. Hinds, 1843)
Notosinister micans C.F. Laseron, 1958
Triphora milda P. Bartsch, 1915
Mastonia millepunctata (S. Kosuge, 1962)
Subulophora minima C.F. Laseron, 1958
Cautor minimus (W.H. Pease, 1871)
Triphora minuata (FOSSIL) (G.P. Deshayes, 1866 †)