Class Mammalia Linnaeus, 1758 - mammals
   Order Rodentia Bowdich, 1821 - rodents
     Suborder Sciurognathi (Tullberg, 1899) see Suborder Sciuromorpha Brandt, 1855
       Family Sciuridae Batsch, 1788 - squirrels, chipmunks, marmots, and prairie dogs
         Subfamily Sciurinae Batsch, 1788 - tree and ground squirrels
           Genus Heliosciurus Trouessart, 1880 - sun squirrels
             1 Heliosciurus gambianus (Ogilby, 1835) - Gambian sun squirrel
             2 Heliosciurus mutabilis Peters, 1852 - southern sun squirrel
             3 Heliosciurus punctatus Temminck, 1853
             4 Heliosciurus rufobrachium Waterhouse, 1842 - red-legged sun squirrel
             5 Heliosciurus ruwenzorii Schwann, 1904 - Ruwenzori sun squirrel
             6 Heliosciurus undulatus (True, 1892) - eastern sun squirrel