Subclass Neornithes Gadow, 1893 see Clade Neornithes Gadow, 1893
   Order Pelecaniformes Sharpe, 1891
     Suborder Phaethontes Sharpe, 1891
       Family Phaethontidae Brandt, 1831 - tropicbirds
         Genus Phaethon Linnaeus, 1758