[Phylum] Chordata Bateson, 1885 - chordates
   Subphylum Craniata auct.
     Infraphylum Vertebrata Lamarck, 1801 - vertebrates
       Superclass Gnathostomata Gegenbaur, 1874 - jawed vertebrates
         Class Osteichthyes Huxley, 1880 - bony fishes and tetrapods see Clade Osteichthyes Huxley 1880 [Moore & Near 2020]
           Subclass Sarcopterygii Romer, 1955 - lobe-finned fishes and tetrapods see [unranked] Sarcopterygii Romer, 1955
             Infraclass Dipnomorpha Ahlberg, 1991 see [unranked] Dipnomorpha Ahlberg, 1991
               Superorder Dipnoi Müller, 1844 see Class Dipneusti
                 Order Ceratodontiformes Berg, 1940 - living lungfishes and their fossil relatives
                   1 Family Lepidosirenidae Bonaparte, 1841 - South American lungfishes
                   2 Family Protopteridae Peters, 1855 - African lungfishes
                   3 Family †Gnathorhizidae Olson, 1951
                   4 Family Neoceratodontidae Schultz, 1948 - Australian lungfishes
                   5 Family †Ceratodontidae Günther, 1871 - Australian lungfishes
                   6 Family †Ptychoceratodontidae Martin, 1982