Class Mammalia Linnaeus, 1758 - mammals
   Order Rodentia Bowdich, 1821 - rodents
     Suborder Sciurognathi (Tullberg, 1899) see Suborder Sciuromorpha Brandt, 1855
       Family Muridae Batsch, 1788 - rats, mice, hamsters, voles, lemmings, and gerbils
         Subfamily Arvicolinae Gray, 1821 - voles
           Genus Lemmus Link, 1795 - true lemmings
             1 Lemmus amurensis Vinogradov, 1924 - Amur lemming
             2 Lemmus lemmus (C. Linnaeus, 1758) - Norway lemming
             3 Lemmus sibiricus (Kerr, 1792) - Siberian lemming