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
           1 Subgenus Ochotona Link, 1795
           2 Subgenus Pika Lacépède, 1799
           3 Subgenus Conothoa Lyon, 1904