Class [Mammalia] Linnaeus, 1758 - mammals
   Order Rodentia Bowdich, 1821 - rodents
     Family Sciuridae Batsch, 1788 - squirrels, chipmunks, marmots, and prairie dogs
       Subfamily Pteromyinae Brandt, 1855 - flying squirrels
         Genus Pteromys Cuvier, 1800 - Old World flying squirrels
           Pteromys momonga Temminck, 1844 - small Japanese flying squirrel
           Pteromys volans (C. Linnaeus, 1758) - Siberian flying squirrel