Phylum Chordata Bateson, 1885 - chordates
   Subphylum Vertebrata Cuvier, 1812 - vertebrates
     Class Mammalia Linnaeus, 1758 - mammals
       Order Cetacea Brisson, 1762 - whales, dolphins, and porpoises see Infraorder Cetacea Brisson, 1762
         Suborder Mysticeti Cope, 1891 - baleen whales see Parvorder Mysticeti Cope, 1891
           Family Eschrichtiidae Ellerman & Morrison-Scott, 1951 - gray whales
             Genus Eschrichtius Gray, 1864 - gray whale