Neornithes Gadow, 1893 - living birds
   Neognathae Pycraft 1900 see Cohort Neognathae Pycraft, 1900
     Neoaves Sibley et al. 1988 see Subcohort Neoaves Sibley et al., 1988
       [Order] Pelecaniformes Sharpe, 1891
         ?Family Phaethontidae Brandt, 1831 [monotypic] - tropicbirds
           Genus Phaethon Linnaeus, 1758
             1 Phaethon aethereus Linnaeus, 1758 - red-billed tropicbird
             2 Phaethon rubricauda Boddaert, 1783 - red-tailed tropicbird
             3 Phaethon lepturus Daudin, 1802 - white-tailed tropicbird