organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Eukaryota Chatton, 1925 - eukaryotes see Domain Eukaryota Chatton, 1925
     Kingdom Animalia Linnaeus, 1758 - animals
       Protostomia Grobben, 1908 see Infrakingdom Protostomia Grobben, 1908
         Phylum Mollusca Linnaeus, 1758 - molluscs
           Class Cephalopoda Cuvier, 1795 - cephalopods
             Subclass †Ammonoidea Zittel, 1884
               Order †Ammonitida Hyatt, 1889
               Order †Anarcestida Miller & Furnish, 1954
               Order †Ceratitida Hyatt, 1884
               Order †Clymeniida Hyatt, 1884
               Order †Goniatitida Hyatt, 1884
               Order †Lytoceratida Hyatt, 1899 see Order Lytocerida
               Order †Meekoceratida see Suborder Meekocerina
               Order †Otoceratida see Suborder Otocerina
               Order †Phylloceratida (Zittel, 1884) see Order Phyllocerida
               Order †Prolecanitida Miller & Furnish, 1954 see Suborder Prolecanitina Miller & Furnish, 1954
               Order †Xenodiscida