[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 †Onychodontida Andrews, 1973 [monotypic] see Order Onychodontida Andrews, 1973
               Order †Onychodontiformes [monotypic] see Order Onychodontida Andrews, 1973
                 Family †Onychodontidae Woodward, 1891
                   1 Genus †Onychodus Newberry, 1857
                   2 Genus †Pycnacanthus Fischer de Waldheim, 1852