Kingdom [Animalia] Linnaeus, 1758 - animals
   Subkingdom Metazoa Haeckel, 1874 see Kingdom Animalia Linnaeus, 1758
     Division Eumetazoa Butschli, 1910 see Subkingdom Eumetazoa Butschli, 1910
       Subdivision Bilateralia
         Phylum Chordata Bateson, 1885 - chordates
           Subphylum Vertebrata Cuvier, 1812 - vertebrates
             Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
               Subclass Neornithes Gadow, 1893 see Clade Neornithes Gadow, 1893
                 Order Procellariiformes Fürbringer, 1888
                   Family Hydrobatidae Mathews, 1912 - storm petrels see Family Oceanitidae Forbes, 1882
                     Tribe Hydrobatini see Subfamily Hydrobatinae Mathews, 1912
                       Genus Halocyptena Coues, 1864 see Genus Oceanodroma Reichenbach, 1853
                         Halocyptena microsoma Coues, 1864 see Oceanodroma microsoma (Coues, 1864)