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 Protoxerus Forsyth Major, 1893 - African giant squirrels
             1 Protoxerus aubinnii Gray, 1873
             2 Protoxerus stangeri (Waterhouse, 1843) - giant forest squirrel
             3 Subgenus Allosciurus
             4 Subgenus Protoxerus (Forsyth Major, 1893)