Class Mammalia Linnaeus, 1758 - mammals
   Subclass Theria Parker & Haswell, 1897
     Order Carnivora Bowdich, 1821 - carnivores
       Suborder Caniformia Kretzoi, 1943
         Family Odobenidae Allen, 1880 [monotypic]
           Genus Odobenus Brisson, 1762 [monotypic] - walrus
             Odobenus rosmarus (Linnaeus, 1758) - walrus
               1 [Odobenus rosmarus rosmarus] (Linnaeus, 1758)
               2 Odobenus rosmarus divergens (Illiger, 1815) - Pacific walrus
               3 Odobenus rosmarus laptevi Chapskii, 1940 - walrus