Turritella marianopsis E.J. Petuch, 1990
Turritella marnochi (FOSSIL) White, 1879 †
Mesalia martinezensis (FOSSIL) W.M. Gabb, 1869 †
Turritella martini (FOSSIL) A.E.M. Cossmann, 1913 †
Turritella masinguiensis (FOSSIL) Clark & J.W. Durham,1946 †
Turritella matarucana (FOSSIL) F. Hodson, 1926 †
Tropicolpus matauensis (FOSSIL) (Finlay & J. Marwick,1937 †)
Turritella mauryana (FOSSIL) R.B. Newton, 1922 †
Colpospira mediolevis (J.C. Verco, 1910)
Pseudomesalia mennessieri (FOSSIL) Pereira,Cassab & Barreto, 2016 †
Turritella merenskyi (FOSSIL) Bohm, 1926 †
Turritella meroensis (FOSSIL) A.A. Olsson, 1931 †
Mesalia mesal (G.P. Deshayes, 1843)
Colposigma mesalia (FOSSIL) Finlay & J. Marwick,1937 †
Turritella miamiensis (FOSSIL) E.J. Petuch, 1994 †
Turritella millepunctata (FOSSIL) S. Nomura, 1935 †
Tropicolpus milleri (FOSSIL) J. Marwick, 1931 †
Vermicularia milleti (FOSSIL) (G.P. Deshayes, 1839 †)
Broderiptella mimetes (FOSSIL) J. Brown & H.A. Pilsbry,1911 †
Mesalia minuta (FOSSIL) Abbass, 1967 †
Turritella minuta (FOSSIL) Koch & R.W. Dunker,1837 †
Tachyrhynchus missellissima J.T. Kuroda
Turritella mississippiensis (FOSSIL) T.A. Conrad, 1848 †
Turritella mitis (FOSSIL) G.P. Deshayes, 1861 †
Turritella mixta (FOSSIL) W.H. Dall, 1892 †
Turritella monilifer (FOSSIL) G.P. Deshayes, 1832 †
Turritella monilifera E. Forbes, 1846
Laxispira monilifera (FOSSIL) N.F. Sohl, 1964 †
Turritella monilis W. Kobelt, 1897
Turritella montensis (FOSSIL) Briart & Cornet, 1873 †
Turritella montserratensis (FOSSIL) W.C. Mansfield, 1925 †
Colpospira moretonensis T.A. Garrard, 1972
Palmerella mortoni (FOSSIL) (T.A. Conrad, 1830 †)
Palmerella mortoni crassa (FOSSIL) Garvie, 2013 †
Turritella multiplicatus (FOSSIL) Pcelincev, 1954 †