Phylum Chordata Bateson, 1885 - chordates
   Subphylum Vertebrata Cuvier, 1812 - vertebrates
     Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
       Order Pelecaniformes Sharpe, 1891
         Family Anhingidae Reichenbach, 1849 - anhingas
         Family Fregatidae Degland & Gerbe, 1867 - frigatebirds
         Family Pelecanidae Rafinesque, 1815 - pelicans
         Family Phaethontidae Brandt, 1831 - tropicbirds
         Family Phalacrocoracidae Reichenbach, 1850 - cormorants
         Family Sulidae Reichenbach, 1849 - gannets, boobies