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 Procellariidae Leach, 1820 - petrels, shearwaters
                     1 Subfamily Fulmarinae see Subfamily Procellariinae Vigors, 1825
                     2 Subfamily Pachyptilinae Oliver, 1930 see Subfamily Procellariinae Vigors, 1825
                     3 Subfamily Pterodrominae see Subfamily Procellariinae Vigors, 1825
                     4 Subfamily Procellariinae Vigors, 1825 see Family Procellariidae Leach, 1820