Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Craniata Linnaeus, 1758 see Subphylum Vertebrata Cuvier, 1812
     Pisces
       Class Sarcopterygii Romer, 1955 - lobe-finned fishes and tetrapods see Clade Sarcopterygii Romer, 1955
         Order Lepidosireniformes Savage, 1951 see Order Dipnoi Müller, 1844
           1 Family Lepidosirenidae Stirton, 1953 - South American lungfishes
           2 Family Protopteridae - African lungfishes