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 Mammalia Linnaeus, 1758 - mammals
               Subclass Eutheria Gill, 1872 see Infraclass Eutheria Gill, 1872
                 Order Cetacea Brisson, 1762 - whales, dolphins, and porpoises see Infraorder Cetacea Brisson, 1762
                   Suborder Mystacoceti (Flower, 1867) see Suborder Mysticeti Cope, 1891
                     Family Eschrichtiidae Ellerman & Morrison-Scott, 1951 - gray whales
                       Genus Eschrichtius Gray, 1864 - gray whale
                         Eschrichtius gibbosus (Erxleben, 1777) see Eschrichtius robustus (Lilljeborg, 1861)