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
             Phaethon lepturus Daudin, 1802 - white-tailed tropicbird
               1 Phaethon lepturus catesbyi Brandt, 1838
               2 Phaethon lepturus ascensionis (Mathews, 1915)
               3 Phaethon lepturus lepturus Daudin, 1802
               4 Phaethon lepturus europae Le Corre & Jouventin, 1999
               5 Phaethon lepturus fulvus Brandt, 1838
               6 Phaethon lepturus dorotheae Mathews, 1913