[Kingdom] Animalia Linnaeus, 1758 - animals
   Grade Enterozoa
     Grade Cœlomata
       Phylum Vertebrata Lamarck, 1801 see Infraphylum Vertebrata Lamarck, 1801
         Branch Craniata Linnaeus, 1758
           Grade Gnathostoma
             Subgrade Heterodactyla branchiata
               Class Dipnoi Müller, 1844 see Superorder Dipnoi Müller, 1844
                 Order Dipneumones
                   1 Genus Protopterus Owen, 1839
                   2 Genus Lepidosiren Fitzinger, 1836