Potamides maracaibensis (FOSSIL) N.E. Weisbord, 1929 †
Tympanotonos margaritaceus (FOSSIL) (G.B. Brocchi, 1814 †)
Tympanotonos margaritaceus bearnensis (FOSSIL) A.E.M. Cossmann& M.A. Peyrot, 1922 †
Tympanotonos margaritaceus grateloupi (FOSSIL) (A.V.M.D. D'Orbigny,1852 †)
Potamides matsoni (FOSSIL) W.H. Dall, 1913 †
Cerithidea mazatlanica H.F. Carpenter, 1857
Cerithidea mazatlanica hegewischii (R.A. Philippi, 1848)
Cerithidea mazatlanica hegewischii californica (S.S. Haldeman, 1840)
Cerithidea mazatlanica sacrata A.A. Gould, 1849
Terebralia mekranica (FOSSIL) E.W. Vredenburg, 1928 †
Tateiwaia merangiana (FOSSIL) (K. Martin, 1922 †)
Cerithideopsilla microptera (L.C. Kiener, 1842)
Terebralia miosulcata (FOSSIL) E.W. Vredenburg, 1928 †
Terebralia mitra (FOSSIL) (J.B.P.A. Lamarck,1804 †)
Potamides mixtus (FOSSIL) (J.L.M. Defrancein G.P. Deshayes, 1833 †)
Potamides mixtus trivittatus (FOSSIL) G.P. Deshayes, 1864 †
Cerithidea moerchii (C.B. Adams, 1855)
Pirenella monilifera (FOSSIL) (G.P. Deshayes, 1825 †)
Cerithideopsis montagnei (A.V.M.D. D'Orbigny,1841)
Potamides moravicus (FOSSIL) R. Hoernes, 1874 †
Potamides moravicus variabilis (FOSSIL) Friedberg, 1914 †
Cerithidea moreleti (G.E.J. Wattebled, 1886)
Tympanotonos morillensis (FOSSIL) Dominici & T. Kowalke,2014 †
Cerithidea multicostata M.M. Schepman, 1919
Urgonella mumiola (FOSSIL) A.E.M. Cossmann, 1916 †
Pirenella nanhaiensis C.C. Fu & D.G. Reid, 2016
Pirenella nipponica T. Ozawa & D.G. Reid,2016
Vicaryella notoensis (FOSSIL) O. Masuda, 1956 †
Cerithidea obtusa (J.B.P.A. Lamarck, 1822)
Potamides occidentalis (FOSSIL) N.H. Woods in Bosworth,1922 †
Pyrazus octogonus (FOSSIL) Cox, 1930 †
Potamides opmei (FOSSIL) C.J. Maury, 1917 †
Cerithidea ornata A. Adams, 1863
Cedrosia pacifica (FOSSIL) L.R. Saul & R.L. Squires,2003 †
Terebralia palustris (C. Linnaeus, 1767)