Class Mammalia Linnaeus, 1758 - mammals
   Subclass Theria Parker & Haswell, 1897
     Order Lagomorpha Brandt, 1855 - lagomorphs
       Family Ochotonidae Thomas, 1897 - pikas
         Genus Ochotona Link, 1795 - pikas
           Subgenus Pika Lacépède, 1799
             Ochotona princeps (Richardson, 1828) - American pika
               Ochotona princeps taylori Grinnell, 1912