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 Nautiloidea Agassiz, 1848
               1 Order †Ascocerida Kuhn, 1949
               2 Order †Discosorida Flower, 1950
               3 Order †Tarphycerida Flower & Kummel, 1950
               4 Order †Oncocerida Flower & Kummel, 1950
               5 Order Nautilida Agassiz, 1848
               6 Order †Ellesmerocerida Flower & Kummel, 1950
               7 Order †Orthocerida Kuhn, 1940