Class [Mammalia] Linnaeus, 1758 - mammals
   Order Pinnipedia Illiger, 1811 - seals, sea lions, and walrus see Parvorder Pinnipedia Illiger, 1811
     Family Phocidae Gray, 1821 - true seals
       Genus Mirounga Gray, 1827 - elephant-seals
         Mirounga angustirostris (Gill, 1866) - northern elephant seal