Perotrochus lucaya F.M. Bayer, 1965
Pleurotomaria lycetti (FOSSIL) d'Orbigny †
Leptomaria macilenta (FOSSIL) Cragin, 1893 †
Talantodiscus mackayi (FOSSIL) Begg & J. Grant-Mackie,2003 †
Pyrgotrochus macrocephalus (FOSSIL) (F.A. von Quenstedt,1858 †)
Leptomaria magneti (FOSSIL) M. Collignon, 1949 †
Conotomaria maileana (FOSSIL) (A.V.M.D. D'Orbigny,1843 †)
Bathrotomaria mandokii (FOSSIL) J. Szabo, 1980 †
Pleurotomaria mariani (FOSSIL) C. Gemmellaro, 1889 †
Murihikua marwicki (FOSSIL) Begg & J. Grant-Mackie,2003 †
Bayerotrochus masoni (FOSSIL) (P.A. Maxwell, 1978 †)
Perotrochus maureri M.G. Harasewych& T.M. Askew, 1993
Pleurotomaria mazarensis (FOSSIL) C. Gemmellaro, 1889 †
Pleurotomaria mendipensis (FOSSIL) Moore †
Perotrochus metivieri P. Anseeuw & Y. Goto,1995
Pleurotomaria mica (FOSSIL) Girty, 1909 †
Bayerotrochus midas (F.M. Bayer, 1965)
Ornatospira mirifira (FOSSIL) Pan, 1982 †
Cyclostomaria monarii (FOSSIL) J. Szabo, 2008 †
Obornella monilifera (FOSSIL) (Terquem & Jourdy,1873 †)
Pleurotomaria monilifera (FOSSIL) White, 1880 †
Pleurotomaria monticuloides (FOSSIL) Hudleston †
Pleurotomaria morrisi (FOSSIL) d'Orbigny †
Pleurotomaria multicincta (FOSSIL) Zieten, 1832 †
Discotoma multipleura (FOSSIL) Pan, 1977 †
Pleurotomaria murchisoniaeformis (FOSSIL) C. Gemmellaro, 1889 †
Pleurotomaria neglecta (FOSSIL) Girty, 1909 †
Pleurotomaria neosolodurina (FOSSIL) Dacque, 1905 †
Plocostoma neumayri (FOSSIL) C. Gemmellaro, 1889 †
Leptomaria nicsimoni (FOSSIL) Monari & Gatto, 2014 †
Pleurotomaria nikitini (FOSSIL) Fliegel, 1901 †
Sisenna ninglangensis (FOSSIL) Pan, 1977 †
Sisenna novoguineana (FOSSIL) Skwarko, 1973 †
Pleurotomaria nuda (FOSSIL) Delpey, 1941 †
Neoplatyteichum numerosum (FOSSIL) C.O. Waterhouse, 1983 †