Neornithes Gadow, 1893 - living birds
Ref: J. Cracraft et al., 2003: 16; Count: [s] 23o;193f;2136g;9595s;8ss; ‡1f;26g;131s
   Neornithes Gadow, 1893 - living birds
  Ref: J. Cracraft et al., 2003: 16; Count: [s] 23o;193f;2136g;9595s;8ss; ‡1f;26g;131s
     Palaeognathae - palaeognaths see Cohort Palaeognathae Pycraft, 1900
    Ref: J. Cracraft et al., 2003: 16; Count: [*] 6f;15g;56s;143ss; ‡3s;3ss
       Palaeognathae - palaeognaths see Cohort Palaeognathae Pycraft, 1900
      Ref: J. Cracraft et al., 2003: 16; Count: [*] 6f;15g;56s;143ss; ‡3s;3ss
         ratites see Subcohort Ratitae Merrem, 1813
        Ref: J. Cracraft et al., 2003: 16; Count: [*] 5f;6g;10s;17ss; ‡2s;2ss
           Family Rheidae Bonaparte, 1849 - rheas
          Ref: E.C. Dickinson, 2003: [22], 35 [rough position] [indirect position]; Count: [*] 2g;2s;8ss
             Genus Rhea Brisson, 1760 [monotypic]
            Ref: E.C. Dickinson, 2003: 35; Count: [*] 1s;5ss
               Rhea americana (Linnaeus, 1758) - greater rhea
              Ref: E.C. Dickinson, 2003: 35; Count: [*] 5ss
                 Rhea americana araneipes Brodkorb, 1938
                Ref: E.C. Dickinson, 2003: 35; Count: -