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
             1 Ochotona alpina (Pallas, 1773)
             2 Ochotona argentata Howell, 1928
             3 Ochotona collaris (Nelson, 1893) - collared pika
             4 Ochotona hoffmanni Formosov et al., 1996
             5 Ochotona hyperborea (Pallas, 1811) - northern pika
             6 Ochotona pallasi (Gray, 1867)
             7 Ochotona princeps (Richardson, 1828) - American pika
             8 Ochotona turuchanensis Naumov, 1934