[Kingdom] Animalia Linnaeus, 1758 - animals
   Grade Enterozoa
     Grade Cœlomata
       Phylum Vertebrata Lamarck, 1801 see Infraphylum Vertebrata Lamarck, 1801
         Branch Craniata Linnaeus, 1758
           Grade Cyclostoma
             Class Hyperotreta
               Genus Bdellostoma Müller, 1835 see Genus Eptatretus Cloquet, 1819