[Kingdom] Animalia Linnaeus, 1758 - animals
   Grade Enterozoa
     Grade Cœlomata
       Phylum Vertebrata Lamarck, 1801 see Infraphylum Vertebrata Lamarck, 1801
         A Branch Urochorda
         B Branch Cephalochorda [monotypic]
         C Branch Craniata Linnaeus, 1758