Class [Mammalia] Linnaeus, 1758 - mammals
   Order Rodentia Bowdich, 1821 - rodents
     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 chrysogaster see Lemmus sibiricus (Kerr, 1792)
           3 Lemmus lemmus (C. Linnaeus, 1758) - Norway lemming
           4 Lemmus nigripes (True, 1894) - black-footed lemming see Lemmus sibiricus (Kerr, 1792)
           5 Lemmus sibiricus (Kerr, 1792) - Siberian lemming