Class Mammalia Linnaeus, 1758 - mammals
   Subclass Theria Parker & Haswell, 1897
     Order Carnivora Bowdich, 1821 - carnivores
       Suborder Caniformia Kretzoi, 1943
         Family Canidae Batsch, 1788 - dogs, wolves, coyotes, jackals, and foxes
           Genus Urocyon Baird, 1857 - grey foxes
             Urocyon littoralis (Baird, 1858) - island fox
               1 [Urocyon littoralis littoralis] (Baird, 1858)
               2 Urocyon littoralis catalinae Merriam, 1903
               3 Urocyon littoralis clementae Merriam, 1903
               4 Urocyon littoralis dickeyi Grinnell & Linsdale, 1930
               5 Urocyon littoralis santacruzae Merriam, 1903
               6 Urocyon littoralis santarosae Grinnell & Linsdale, 1930