Class Mammalia Linnaeus, 1758 - mammals
   Subclass Theria Parker & Haswell, 1897
     Order Carnivora Bowdich, 1821 - carnivores
       Suborder Caniformia Kretzoi, 1943
         Family Otariidae Gray, 1825 - eared seals, fur seals, and sea lions
           Genus Zalophus Gill, 1866 - California sea lion
             1 Zalophus californianus (Lesson, 1828) - California sealion
             2 ‡Zalophus japonicus (Peters, 1866) - Japanese sealion
             3 Zalophus wollebaeki Sivertsen, 1953 - Galapagos sea lion