Class Aves Linnaeus, 1758 - birds
see Subclass Aves Linnaeus, 1758
Subclass Ornithurae Haeckel, 1866
see Clade Ornithurae Haeckel 1866 [Gauthier 1986] {Chiappe 1991}
Infraclass Ratitae (Merrem, 1813) P. Brodkorb, 1963
see Parvclass Ratitae (Merrem, 1813)
Order Rheiformes Forbes, 1884
see Suborder Rheae Forbes, 1884
Family Rheidae Bonaparte, 1849 - rheas
Genus Rhea Brisson, 1760