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 Struthiornithiformes
         Genus ‡Emeus Reichenbach, [1852]
           1 ‡Emeus crassus (Owen, 1846)