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] Gaviiformes Wetmore & Miller, 1926 [monotypic]
         Family Gaviidae Allen, 1897 [monotypic] - divers
           Genus Gavia Forster, 1788
             1 Gavia stellata (Pontoppidan, 1763) - red-throated diver
             2 Gavia arctica (Linnaeus, 1758) - black-throated diver
             3 Gavia pacifica (Lawrence, 1858) - Pacific loon
             4 Gavia immer (Brünnich, 1764) - common loon
             5 Gavia adamsii (Gray, 1859) - white-billed diver