Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
   Subclass Ornithurae Haeckel, 1866 see Clade Ornithurae Haeckel 1866 [Gauthier 1986] {Chiappe 1991}
     Infraclass Ratitae (Merrem, 1813) P. Brodkorb, 1963 see Parvclass Ratitae (Merrem, 1813)
       Order Casuariiformes Sclater, 1880
         1 Family Casuariidae Kaup, 1847 - cassowaries
         2 Family Dromiceiidae Wetmore see Family Dromaiidae Huxley, 1868
         3 Family †Dromornithidae Vigors, 1825 - mihirungs