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
           1 Superorder Apterygimorphae
           2 Superorder Casuariimorphae B.C. Livezey & R.L. Zusi, 2007
           3 Superorder Struthionimorphae B.C. Livezey & R.L. Zusi, 2007