Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Mollusca Linnaeus, 1758 - molluscs
     Subphylum Cyrtosoma Runnegar & Pojeta Jr., 1974 see Phylum Mollusca Linnaeus, 1758
       Class Cephalopoda Cuvier, 1795 - cephalopods
         Subclass †Ammonoidea Zittel, 1884
           Genus †Agoniatites Meek, 1877
           Genus †Altudoceras Ruzhencev, 1940
           Genus †Anaklinoceras Stephenson, 1941
           Genus †Baculites Lamarck, 1799
           Genus †Cirroceras Conrad, 1866
           Genus †Clioscaphites Cobban, 1951
           Genus †Columbites Hyatt & Smith, 1905
           Genus †Gastrioceras Hyatt, 1884
           Genus †Homoceras Hyatt, 1884
           Genus †Imitoceras Schindewolf, 1924
           Genus †Leptoceras Uhlig, 1883
           Genus †Lytoceras Suess, 1865
           Genus †Meekoceras White, 1880
           Genus †Muensteroceras Librovitch, 1927
           Genus †Neogastroplites McLearn, 1931
           Genus †Neostlingoceras Klinger & Kennedy, 1978
           Genus †Nostoceras Hyatt, 1894
           Genus †Nostroceras
           Genus †Prodromites Smith & Weller, 1901
           Genus †Protocanites Paeckelmann, 1923
           Genus †Pseudolioceras Buckman, 1889
           Genus †Sagenites Mojsisovics, 1879
           Genus †Scaphites Parkinson, 1811
           Genus †Solenoceras Conrad, 1860
           Genus †Tissotia Douvillé, 1890
           Genus †Tragodesmoceras Spath, 1922
           Genus †Uddenites Böse, 1917
           Genus †Waagenoceras Gemmellaro, 1888