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 Phaethon lepturus ascensionis (Mathews, 1915)