Phylum [Vertebrata] Lamarck, 1801 see Infraphylum Vertebrata Lamarck, 1801
   Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
     Subclass Neornithes Gadow, 1893 see Clade Neornithes Gadow, 1893
       Order Ciconiiformes Bonaparte, 1854
         1 Genus ‡Harpagornis Haast, 1872
         2 Genus †Palaelodus Milne-Edwards, 1863
         3 Genus ‡Pinguinus Bonnaterre, 1791
         4 Genus †Argentavis Campbell & Tonni, 1980
         5 Genus †Limnofregata Olson, 1977
         6 Genus †Osteodontornis Howard