Kingdom [Animalia] Linnaeus, 1758 - animals
   Subkingdom Metazoa Haeckel, 1874 see Kingdom Animalia Linnaeus, 1758
     Division Eumetazoa Butschli, 1910 see Subkingdom Eumetazoa Butschli, 1910
       Subdivision Bilateralia
         Phylum Chordata Bateson, 1885 - chordates
           Subphylum Vertebrata Cuvier, 1812 - vertebrates 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 Struthioniformes Latham, 1790
                   Suborder Rheae Forbes, 1884
                     Family Rheidae Bonaparte, 1849 - rheas
                       Genus Pterocnemia Gray, 1871
                         Pterocnemia pennata (d'Orbigny, 1834) - lesser rhea
                           1 Pterocnemia pennata pennataᵀ (d'Orbigny, 1834)
                           2 Pterocnemia pennata garleppi Chubb, 1913