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 Balaenopteridae Gray, 1864 - rorquals
                       Genus Balaenoptera Lacépède, 1804 - rorquals
                         Balaenoptera musculus (Linnaeus, 1758) - blue whale
                           Balaenoptera musculus brevicauda Zemsky & Boronin, 1964