Subclass Avialae Gauthier, 1986
see Clade Avialae Gauthier 1986
Infraclass Aves Linnaeus, 1758
see Subclass Aves Linnaeus, 1758
Parvclass Neornithes Gadow, 1893
see Subclass Neornithes Gadow, 1893
Cohort Palaeognathae Pycraft, 1900
Subcohort Ratitae Merrem, 1813
Superorder Struthionimorphae B.C. Livezey & R.L. Zusi, 2007
Order ‡Aepyornithiformes Newton, 1884
1 Family ‡Aepyornithidae Bonaparte, 1853 - elephant birds