Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
   Subclass Ornithurae Haeckel, 1866 see Clade Ornithurae Haeckel 1866 [Gauthier 1986] {Chiappe 1991}
     Infraclass Carinatae Merrem, 1813 see Clade Carinatae Merrem 1813 [Gauthier & de Queiroz 2001]
       01 Order Gaviiformes Wetmore & Miller, 1926
       02 Order Podicipediformes Fürbringer, 1888
       03 Order Sphenisciformes Sharpe, 1891
       04 Order Procellariiformes Fürbringer, 1888
       05 Order Pelecaniformes Sharpe, 1891
       06 Order Ardeiformes Wagler, 1830