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 Odontoceti Flower, 1867 - toothed whales see Parvorder Odontoceti Flower, 1867
           Family Physeteridae Gray, 1821 - sperm whales
             Genus Physeter Linnaeus, 1758 - sperm whale