Class Aves Linnaeus, 1758 - birds
see Subclass Aves Linnaeus, 1758
Subclass Neornithes Gadow, 1893
see Clade Neornithes Gadow, 1893
Infraclass Eoaves Sibley et al., 1988
see Cohort Palaeognathae Pycraft, 1900
Parvclass Ratitae (Merrem, 1813)
see Subcohort Ratitae Merrem, 1813
Order Struthioniformes Latham, 1790
Suborder Struthioni
Infraorder Rheides
see Suborder Rheae Forbes, 1884
1 Family Rheidae Bonaparte, 1849 - rheas