Apachella malaysia (FOSSIL) Batten, 1972 †
Ananias marcouiana (FOSSIL) (H.B. Geinitz, 1866 †)
Glyptotomaria marginata (FOSSIL) Batten, 1958 †
Deacheospira maritima (FOSSIL) (E.F.R.K. Koken, 1897 †)
Dictyotomaria meekana (FOSSIL) (J.W. Hall, 1856 †)
Hypselentoma memmiae (FOSSIL) Termier & Termier, 1977 †
Glabrocingulum mephitifontis (FOSSIL) W.J. Gordon& E.L. Yochelson, 1987 †
Barrealispira mesigosi (FOSSIL) Taboada & Sabattini,1987 †
Umbotropis mesoni (FOSSIL) Tassell, 1982 †
Luciellina micra (FOSSIL) Pan, 1977 †
Cataschisma microsoma (FOSSIL) E.F.R.K. Koken& J. Perner, 1925 †
Pleurorima migrans (FOSSIL) J. Perner, 1907 †
Stenoloron minor (FOSSIL) Blodgett & Johnson,1992 †
Abylea minuta (FOSSIL) Sturgeon, 1964 †
Baylea minuta (FOSSIL) Weller, 1916 †
Glabrocingulum minutum (FOSSIL) Rollins, 1975 †
Angyomphalus minutus (FOSSIL) Sayre, 1930 †
Pragoloron miser (FOSSIL) (J. Perner, 1907 †)
Mourlonia missouriensis (FOSSIL) (Weller, 1906 †)
Campbellospira missouriensis (FOSSIL) K. Bandel, 2009 †
Euconospira missouriensis (FOSSIL) (Swallow, 1860 †)
Cataschisma mjoela (FOSSIL) (E.L. Yochelson, 1963 †)
Deacheospira mjoesa (FOSSIL) (E.L. Yochelson, 1963 †)
Peruvispira modesta (FOSSIL) C.O. Waterhouse, 1963 †
Mourlonia monensis (FOSSIL) Weir, 1925 †
Deseretospira moniliniformis (FOSSIL) W.J. Gordon& E.L. Yochelson, 1987 †
Pleurorima moydartensis (FOSSIL) (McLearn, 1924 †)
Apachella mulensis (FOSSIL) Batten, 1989 †
Angyomphalus multicostatus (FOSSIL) H. Guo, 1983 †
Champernownia multispira (FOSSIL) (C.L.F. von Sandberger& C.L.F. von Sandberger, 1854 †)
Ananias nana (FOSSIL) (Yin, 1932 †)
Euryzone naticaeformis (FOSSIL) (C.L.F. von Sandberger& C.L.F. von Sandberger, 1853 †)
Mourlonia naticoides (FOSSIL) (de Koninck, 1843 †)
Baylea nemdaensis (FOSSIL) Mazaev, 2015 †
Euconospira neptuni (FOSSIL) (Münster, 1840 †)