Class Mammalia Linnaeus, 1758 - mammals
   Order Rodentia Bowdich, 1821 - rodents
     Suborder Sciurognathi (Tullberg, 1899) see Suborder Sciuromorpha Brandt, 1855
       Family Muridae Batsch, 1788 - rats, mice, hamsters, voles, lemmings, and gerbils
         Subfamily Arvicolinae Gray, 1821 - voles
           Genus Phenacomys Merriam, 1889 - heather vole
             1 Phenacomys intermedius Merriam, 1889 - heather vole
             2 Phenacomys ungava Merriam, 1889 - Ungava vole