Phylum Chordata Bateson, 1885 - chordates
   Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
     Subclass Neornithes Gadow, 1893 see Clade Neornithes Gadow, 1893
       Superorder Neognathae Pycraft, 1900 see Cohort Neognathae Pycraft, 1900
         Order Podicipediformes Fürbringer, 1888
           Family Podicipedidae Bonaparte, 1832 - grebes
             1 Genus Tachybaptus Reichenbach, 1853
             2 Genus Podilymbus Lesson, 1831
             3 Genus Rollandia Bonaparte, 1856
             4 Genus Poliocephalus Selby, 1840
             5 Genus Podiceps Latham, 1787
             6 Genus Aechmophorus Coues, 1862