Monilea marshallensis (FOSSIL) H.S. Ladd, 1966 †
Pseudostomatella martini G.T. Poppe, S.P. Tagaro& H. Dekker, 2006
Thalotia martinsi (FOSSIL) d'Archaic, 1850 †
Francisciconcha maslennikovi (FOSSIL) C. Little & al., 2004 †
Gibbula massieri E. Rolán & M.L. Zettler,2010
Fagnastesia matanzana (FOSSIL) C. Nielsen & al., 2004 †
Monilea mateana (FOSSIL) H.S. Ladd, 1934 †
Jujubinus matoni (B.C.M. Payraudeau, 1827)
Clanculus maugeri Wood, 1828
Clanculus mauritianus J.C. Melvill, 1909
Clanculus maxillatus K.T. Menke, 1843
Trochus maximiliani (FOSSIL) Klipstein, 1843 †
Gibbula megamagus (FOSSIL) A.E.M. Cossmann, 1918 †
Oxystele merula (L.W. Dillwyn, 1817)
Clanculus microdon A. Adams, 1853
Clelandella miliaris (G.B. Brocchi, 1814)
Chlorodiloma millelineata (C. Bonnet, 1864)
Gibbula milleti (FOSSIL) B.M. Landau, L. Ceulemans& F. Van Dingenen, 2016 †
Clanculus miniatus (H.E. Anton, 1838)
Clanculus miniatus alfredensis P. Bartsch, 1915
Conotalopia minima (A.N. Golikov, 1967)
Ethalia minolina J.C. Melvill, 1897
Stomatella minor (N.H. Odhner, 1917)
Clanculus minor (C.B. Adams, 1863)
Monodonta minuta (FOSSIL) Stanton, 1947 †
Diloma miocenica (FOSSIL) C. Nielsen & al., 2004 †
Clanculopsis mixtus E.A. Smith, 1903
Calthalotia modesta (K.H.J. Thiele, 1930)
Stomatella modesta H. Adams & A. Adams, 1864
Trochus monilectus (FOSSIL) Phillips, 1829 †
Umbonium moniliferum (J.B.P.A. Lamarck, 1822)
Lirularia monodi (E. Fischer-Piette& M. Nicklés, 1946)
Jujubinus montagui (W. Wood, 1828)
Stomatella monteiroi G.T. Poppe, S.P. Tagaro& H. Dekker, 2006
Trochus moorei (FOSSIL) McCoy †