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]
       Order Podicipediformes Fürbringer, 1888
         Family Podicipedidae Bonaparte, 1832 - grebes
           1 Genus Podiceps Latham, 1787
           2 Genus †Pliodytes Brodkorb