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 Pelecaniformes Sharpe, 1891
           Suborder Pelecani Sharpe, 1891 see Infraorder Pelecanides Sharpe, 1891
             1 Family Pelecanidae Rafinesque, 1815 - pelicans
             2 Family Sulidae Reichenbach, 1849 - gannets, boobies
             3 Family Phalacrocoracidae Reichenbach, 1850 - cormorants
             4 Family Anhingidae Reichenbach, 1849 - anhingas