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
             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 Marmotini Pocock, 1923
                             Genus Citellus Oken, 1816 see Genus Spermophilus Cuvier, 1825
                               Citellus annulatus (Audubon & Bachman, 1842) see Spermophilus annulatus Audubon & Bachman, 1842
                               Citellus armatus (Kennicott, 1863) see Spermophilus armatus Kennicott, 1863
                               Citellus beecheyi (Richardson, 1829) see Spermophilus beecheyi (Richardson, 1829)
                               Citellus beldingi (Merriam, 1888) see Spermophilus beldingi Merriam, 1888
                               Citellus citellus (Linnaeus, 1776) see Spermophilus citellus Linnaeus, 1766
                               Citellus columbianus (Ord, 1815) see Spermophilus columbianus (Ord, 1815)
                               Citellus eversmanni (Brandt, 1841)
                               Citellus franklinii (Sabine, 1822) see Spermophilus franklinii (Sabine, 1822)
                               Citellus fulvus (Lichtenstein, 1823) see Spermophilus fulvus Lichtenstein, 1823
                               Citellus harrisi (Audubon & Bachman, 1854) see Ammospermophilus harrisii (Audubon & Bachman, 1854)
                               Citellus lateralis (Say, 1823) see Spermophilus lateralis (Say, 1823)
                               Citellus leucurus (Merriam, 1889) see Ammospermophilus leucurus (Merriam, 1889)
                               Citellus mexicanus (Erxleben, 1777) see Spermophilus mexicanus (Erxleben, 1777)
                               Citellus mohavensis (Merriam, 1889) see Spermophilus mohavensis Merriam, 1889
                               Citellus nelsoni (Merriam, 1893) see Ammospermophilus nelsoni (Merriam, 1893)
                               Citellus pygmaeus (Pallas, 1779) see Spermophilus pygmaeus Pallas, 1778
                               Citellus richardsonii (Sabine, 1822) see Spermophilus richardsonii (Sabine, 1822)
                               Citellus rufescens (Keyserling & Blasius, 1840)
                               Citellus spilosoma (Bennett, 1833) see Spermophilus spilosoma Bennett, 1833
                               Citellus suslicus (Güldenstaedt, 1770) see Spermophilus suslicus Güldenstaedt, 1770
                               Citellus tereticaudus (Baird, 1858) see Spermophilus tereticaudus Baird, 1858
                               Citellus townsendi (Bachman, 1839) see Spermophilus townsendii Bachman, 1839
                               Citellus tridecemlineatus (Mitchill, 1821) see Spermophilus tridecemlineatus (Mitchill, 1821)
                               Citellus undulatus (Pallas, 1779) see Spermophilus undulatus Pallas, 1778
                               Citellus variegatus (Erxleben, 1777) see Spermophilus variegatus (Erxleben, 1777)
                               Citellus washingtoni A.H. Howell, 1938 see Spermophilus washingtoni (A.H. Howell, 1938)