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
           01 Genus Ammospermophilus Merriam, 1892 - antelope-squirrels
           02 Genus Atlantoxerus Forsyth Major, 1893 - Barbary ground squirrel
           03 Genus Callosciurus Gray, 1867 - Oriental tree squirrels
           04 Genus Cynomys Rafinesque, 1817 - prairie dogs
           05 Genus Dremomys Heude, 1898 - red-cheeked squirrels
           06 Genus Epixerus Thomas, 1909 - African palm squirrels
           07 Genus Exilisciurus Moore, 1958 - pygmy squirrels
           08 Genus Funambulus Lesson, 1832 - palm squirrels
           09 Genus Funisciurus Trouessart, 1880 - African striped squirrels
           10 Genus Glyphotes Thomas, 1898 - Bornean pygmy squirrels
           11 Genus Heliosciurus Trouessart, 1880 - sun squirrels
           12 Genus Hyosciurus Archbold & Tate, 1935 - Sulawesi long-nosed squirrels
           13 Genus Lariscus Thomas & Wroughton, 1909 - Malaysian striped ground squirrels
           14 Genus Marmota Blumenbach, 1779 - marmots
           15 Genus Menetes Thomas, 1908 - Berdmore's palm squirrel
           16 Genus Microsciurus Allen, 1895 - American pygmy squirrels
           17 Genus Myosciurus Thomas, 1909 - African pygmy squirrel
           18 Genus Nannosciurus Trouessart, 1880 - black-eared squirrel
           19 Genus Paraxerus Forsyth Major, 1893 - African bush squirrels
           20 Genus Prosciurillus Ellerman, 1947 - Sulawesi dwarf squirrels
           21 Genus Protoxerus Forsyth Major, 1893 - African giant squirrels
           22 Genus Ratufa Gray, 1867 - Oriental giant squirrels
           23 Genus Rheithrosciurus Gray, 1867 - groove-toothed squirrel
           24 Genus Rhinosciurus Gray, 1843 - long-nosed squirrel
           25 Genus Rubrisciurus Ellerman, 1954
           26 Genus Sciurillus Thomas, 1914 - Neotropical pygmy squirrel
           27 Genus Sciurotamias Miller, 1901 - rock squirrels
           28 Genus Sciurus Linnaeus, 1758 - tree squirrels
           29 Genus Spermophilopsis Blasius, 1884 - long-clawed ground squirrel
           30 Genus Spermophilus Cuvier, 1825 - ground squirrels
           31 Genus Sundasciurus Moore, 1958 - Sunda squirrels
           32 Genus Syntheosciurus Bangs, 1902 - Neotropical montane squirrel see Genus Sciurus Linnaeus, 1758
           33 Genus Tamias Illiger, 1811 - chipmunks
           34 Genus Tamiasciurus Trouessart, 1880 - American red squirrels
           35 Genus Tamiops Allen, 1906 - Oriental striped squirrels
           36 Genus Xerus Hemprich & Ehrenberg, 1832 - African ground squirrels