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 Sphenisciformes Sharpe, 1891
           Family Spheniscidae Bonaparte, 1831 - penguins
             1 Genus Aptenodytes Miller, 1778
             2 Genus Pygoscelis Wagler, 1832
             3 Genus Eudyptes Vieillot, 1816
             4 Genus Megadyptes Milne-Edwards, 1880
             5 Genus Eudyptula Bonaparte, 1856
             6 Genus Spheniscus Brisson, 1760