Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
Count: 28o;94f;139g;10s; ‡2o;4f;17g; †3o;34f;315g;10s
   Subclass Ornithurae Haeckel, 1866 see Clade Ornithurae Haeckel 1866 [Gauthier 1986] {Chiappe 1991}
  Count: 28o;94f;139g;10s; ‡2o;4f;17g; †1o;32f;312g;4s
     Infraclass Ratitae (Merrem, 1813) P. Brodkorb, 1963 see Parvclass Ratitae (Merrem, 1813)
    Count: [o†g] 4o;5f;5g; ‡2o;3f;6g; †3f;11g
       Order ‡Aepyornithiformes Newton, 1884
      Count: -
         Family ‡Aepyornithidae Bonaparte, 1853 - elephant birds
        Count: [g†g] ‡1g‡‡3g
           Subfamily ‡Aepyornithinae Bonaparte, 1853
          Count: [g†g] ‡1g‡‡2g
             Genus †Mullerornis Milne-Edwards & Grandidier, 1894
            Count: -