Metazoa see Kingdom Animalia Linnaeus, 1758
   Gastraeozoa
     Trochaeozoa see [unranked] Bilateria Hatschek, 1888
       Protornaeozoa
         Notoneuralia Ulrich, 1951
           Brachiata
             Phylum Pterobranchia Lankester, 1877 see Class Pterobranchia Lankester, 1877