Sinployea monstrosa (C.M.F. Ancey, 1889)
Flammocharopa montana (H.H. Suter, 1891)
Setomedea monteithi J. Stanisic, 1990
Charopa montivaga H.H. Suter, 1894
Allodiscus morioria B.A. Marshall & G.M. Barker,2008
Chaureopa mossi (R. Murdoch, 1897)
Cavellioropa moussoni (H.H. Suter, 1890)
Danielleilona multicostata J. Stanisic, 1993
Coenocharopa multiradiata J. Stanisic, 1990
Johannesoconcha multivolva H.B. Preston, 1913
Sinployea muri F.J. Brook, 2010
Ngairea murphyi (J.C. Cox, 1864)
Elsothera murrayana (L. Pfeiffer, 1864)
Cavellia mutabilis (H.H. Suter, 1891)
Elsothera nautilodea (J.C. Cox, 1866)
Sinployea navutuenis G.A. Solem, 1983
Vatusila nayauana G.A. Solem, 1983
Allodiscus negiae B.A. Marshall & G.M. Barker,2008
Therasiella neozelanica R.A. Cumber, 1967
Russatus nigrescens O.F. von Möllendorff
Oreokera nimbus J. Stanisic, 1987
Sinployea nissani (R.K. Dell, 1955)
Pillomena nivea (C. Hedley, 1896)
Norfolcioconcha norfolkensis (C. Hedley, 1899)
Afrodonta novemlamellaris (H.C. Burnup, 1912)
Phenacharopa novoseelandica (L. Pfeiffer, 1853)
Paryphantopsis nucella J. Slapcinsky & R. Lasley,2007
Setomedea nudicostata J. Stanisic, 1990
Allodiscus occidaneus B.A. Marshall & G.M. Barker,2008
Ptychodon occulta N.H. Odhner, 1921
Charopa ochra W.H. Webster, 1904
Amphidoxa ochseni (R.A. Philippi, 1855)
Cavellia oconnori R.K. Dell, 1950
Phacussa oconnori A.W.B. Powell, 1941
Pernagera officeri (C.M.D.E. Legrand, 1871)