Order Pelecaniformes Sharpe, 1891
   1 Family Phaetontidae
   2 Family Pelecanidae Rafinesque, 1815 - pelicans
   3 Family Phalacrocoracidae Reichenbach, 1850 - cormorants
   4 Family Anhingidae Reichenbach, 1849 - anhingas
   5 Family Sulidae Reichenbach, 1849 - gannets, boobies
   6 Family Fregatidae Degland & Gerbe, 1867 - frigatebirds