Phylum Chordata Bateson, 1885 - chordates
Status: extant
   Subphylum Vertebrata Cuvier, 1812 - vertebrates
  Status: extant
     Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
    Status: extant
       Order Rheiformes Forbes, 1884 see Suborder Rheae Forbes, 1884
      Status: extant
         Family Rheidae Bonaparte, 1849 - rheas
        Status: extant