living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
     Kingdom Animalia Linnaeus, 1758 - animals
       Subkingdom Eumetazoa Butschli, 1910 see [unranked] Eumetazoa Bütschli, 1910
         Phylum Hemichordata Bateson, 1885 - hemichordates
           Class Pterobranchia Lankester, 1877 - pterobranchs
             Family Cephalodiscidae Schimkewitsch, 1893
               Genus Cephalodiscus M'Intosh, 1882
                 Cephalodiscus sibogae Harmer, 1905