Subclass Neornithes Gadow, 1893 see Clade Neornithes Gadow, 1893
   Order Pelecaniformes Sharpe, 1891
     Suborder Pelecani Sharpe, 1891 see Infraorder Pelecanides Sharpe, 1891
       1 Family Fregatidae Degland & Gerbe, 1867 - frigatebirds
       2 Family Phalacrocoracidae Reichenbach, 1850 - cormorants
       3 Family Sulidae Reichenbach, 1849 - gannets, boobies
       4 Family Pelecanidae Rafinesque, 1815 - pelicans