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 Arborimus Taylor, 1915 - tree voles see Genus Phenacomys Merriam, 1889
             1 Arborimus albipes (Merriam, 1901) - white-footed vole see Phenacomys albipes
             2 Arborimus longicaudus (True, 1890) - red tree vole see Phenacomys longicaudus
             3 Arborimus pomo Johnson & George, 1991 see Phenacomys pomo