[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 Actinopterygii Woodward, 1891 - ray-finned fishes see Class Actinopterygii Woodward, 1891
             Order †Palaeonisciformes Jarvik, 1961
               Family †Cosmoptygiidae van der Laan, 2018, orth. inval., incertae sedis see Family Cosmoptychiidae Gardiner, 1963
                 Genus †Cosmoptygius van der Laan, 2018, orth. inval. see Genus Cosmoptychius Traquair, 1877