Anchura nanaimoensis (FOSSIL) (J.J.F. Whiteaves,1879 †)
Drepanocheilus nebrascensis (FOSSIL) (J. Evans & Shumard,1854 †)
Dimorphosoma neglecta (FOSSIL) R. Tate †
Helicaulax neubaueri (FOSSIL) (F. Riedel, 1932 †)
Protohemichenopus neuquensis (FOSSIL) Camacho, 1953 †
Cultrigera nilssoni (FOSSIL) (J. Müller, 1851 †)
Anchura noackensis (FOSSIL) L.W. Stephenson, 1941 †
Latiala nodosa (FOSSIL) (A. Packard, 1922 †)
Monocuphus nodulosus (FOSSIL) (Hebert & Deslongchamps,1860 †)
Struthiochenopus nordenskjoldi (FOSSIL) (R.O. Wilckens, 1910 †)
Drepanocheilus noueli (FOSSIL) (A.V.M.D. D'Orbigny,1850 †)
Struthioptera novoseelandica (FOSSIL) (R.O. Wilckens, 1922 †)
Dicroloma nudispira (FOSSIL) A. Kaim, 2004 †
Cuphosolenus nuecensis (FOSSIL) Stanton, 1947 †
Lispodesthes nuptialis (FOSSIL) (White, 1874 †)
Drepanocheilus obesus (FOSSIL) (N.F. Sohl, 1967 †)
Lispodesthes obscurata (FOSSIL) White, 1883 †
Dicroloma obtusata (FOSSIL) (Hebert & Deslongchamps,1860 †)
Arrhoges occidentalis (H.H. Beck, 1836)
Arrhoges occidentalis labradorensis (C.W. Johnson, 1930)
Ceratosiphon oligochilus (FOSSIL) (J. Gardner, 1875 †)
Quadrinervus oolithicus (FOSSIL) (Buvignier, 1843 †)
Dimorphosoma opeatochila (FOSSIL) J. Gardner, 1875 †
Anchura orfellensis (FOSSIL) Bricchi, 1950 †
Goniocheila orientalis (FOSSIL) Abbass, 1967 †
Chenopus ornatus (FOSSIL) Buvignier, 1852 †
Helicaulax ornatus (FOSSIL) (A.V.M.D. D'Orbigny,1843 †)
Struthioptera osiris (FOSSIL) H.J. Finlay & J. Marwick,1937 †
Ceratosiphon ovatus (FOSSIL) (Münsterin G.A. Goldfuss, 1844 †)
Aporrhais oxydactyla (FOSSIL) (C.L.F. von Sandberger,1861 †)
Anchura pacifica (FOSSIL) A.A. Olsson, 1944 †
Monocuphus pagoda (FOSSIL) (Morris & J. Lycett,1851 †)
Arrhoges paleocaenica (FOSSIL) Rosenkranz, 1970 †
Monocuphus palmatus (FOSSIL) (C.H. Blake, 1905 †)
Lispodesthes panda (FOSSIL) L.W. Stephenson, 1952 †