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
         Genus †Diaboloceras (Miller & Furnish, 1940)
         Genus †Exiteloceras Hyatt, 1894
         Family †Kosmoceratidae Haug, 1887
         Genus Nautilus Linnaeus, 1758
         Genus Octopus Cuvier, 1798
         Genus †Perrinites Böse, 1917
         Genus †Plectronoceras Ulrich & Foerste, 1933
         Genus †Xenodiscus Waagen, 1879
         1 Subclass Nautiloidea Agassiz, 1848
         1.n? Subclass †Bactritoidea Shimanskiy, 1951
         1.n?.n.1 Subclass †Ammonoidea Zittel, 1884
         1.n?.n.2 Subclass Coleoidea Bather, 1888
         2 Subclass †Endoceratoidea Teichert, 1933
         3 Subclass †Actinoceratoidea Teichert et al., 1964