Sassia maoria (FOSSIL) (Finlay, 1924 †)
Sassia marchandi (FOSSIL) A.E.M. Cossmann, 1905 †
Septa marerubrum (F. García-Talavera,1985)
Gyrineum marginatum (FOSSIL) (J.F. Gmelin, 1790 †)
Haurokoa marwicki (FOSSIL) (Finlay, 1924 †)
Sassia melpangi M.G. Harasewych & A.G. Beu,2007
Charonia microstoma (FOSSIL) A.E.M. Cossmann & G. Pissarro †,
Sassia midwayensis (T. Habe & T.A. Okutani,1968)
Sassia mimetica (R. Tate, 1893)
Sassia minima (FOSSIL) (F.W. Hutton, 1873 †)
Septa mixta (A. Arthur& F. García-Talavera, 1990)
Ranularia monilifera (A. Adams & L.A. Reeve,1850)
Sassia morgani (FOSSIL) A.E. Ortmann, 1900 †
Gyrineum morrisi (FOSSIL) d'Archiac, 1854 †
Ranularia multicostata (FOSSIL) A.E.M. Cossmann& M.A. Peyrot, 1923 †
Sassia multigranifera (FOSSIL) (G.P. Deshayes, 1835 †)
Charonia multigranus (FOSSIL) (A. von Koenen †)
Charonia multinodosa (FOSSIL) F. Traub, 1979 †
Monoplex mundus Gould, 1849
Cymatium muricinum (FOSSIL) Roeding, 1798 †
Gutturnium muricinum (P.F. Röding, 1798)
Gutturnium muricinum antillarum (P.F. Röding, 1798)
Gutturnium muricinum cercadicum (FOSSIL) C.J. Maury, 1917 †
Fusitriton murrayi (E.A. Smith, 1891)
Sassia namnetense (FOSSIL) A.E.M. Cossmann 1889 †
Sassia nassariformis (G.B. III Sowerby, 1902)
Gyrineum natator (P.F. Röding, 1798)
Gyrineum natator tuberculatus W.J. Broderip, 1833
Sassia neozelanica (FOSSIL) (P. Marshall& R. Murdoch, 1923 †)
Monoplex nicobaricus (P.F. Röding, 1798)
Sassia nodularia (FOSSIL) (J.B.P.A. Lamarck,1803 †)
Charonia nodularium (FOSSIL) (J.B.P.A. Lamarck,1803 †)
Monoplex norai (F. García-Talavera& J.B. Vera, 2004)
Sassia nucleoides (FOSSIL) Garvie, 1996 †
Ranularia oblita H. Lewis & A.G. Beu, 1976