Kingdom [Animalia] Linnaeus, 1758 - animals
   Subkingdom Metazoa Haeckel, 1874 see Kingdom Animalia Linnaeus, 1758
     Division Eumetazoa Butschli, 1910 see Subkingdom Eumetazoa Butschli, 1910
       Subdivision Bilateralia
         Phylum Chordata Bateson, 1885 - chordates
           Subphylum Vertebrata Cuvier, 1812 - vertebrates see Infraphylum Vertebrata Lamarck, 1801
             Class Mammalia Linnaeus, 1758 - mammals
               Subclass Eutheria Gill, 1872 see Infraclass Eutheria Gill, 1872
                 Order Rodentia Bowdich, 1821 - rodents
                   Suborder Sciuromorpha Brandt, 1855
                     Superfamily Sciuroidea Batsch, 1788
                       Family Sciuridae Batsch, 1788 - squirrels, chipmunks, marmots, and prairie dogs
                         Subfamily Sciurinae Batsch, 1788 - tree and ground squirrels
                           Tribe Sciurini Batsch, 1788
                             Genus Sciurus Linnaeus, 1758 - tree squirrels
                               Sciurus vulgaris Linnaeus, 1758 - Eurasian red squirrel
                                 Sciurus vulgaris exalbidus Pallas, 1778
                                 Sciurus vulgaris fuscoater Altum, 1876
                                 Sciurus vulgaris leucourus Kerr, 1792
                                 Sciurus vulgaris russus Miller, 1907