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 †Endoceratoidea Teichert, 1933
           Genus †Allopiloceras Ulrich & Foerste, 1935
           Genus †Cameroceras Conrad, 1842
           Genus †Cassinoceras Ulrich & Foerste, 1935
           Genus †Cotteroceras Ulrich & Foerste, 1935
           Genus †Endoceras Hall, 1847
           Genus †Piloceras Salter, 1859