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 Synaptomys Baird, 1857 - bog lemmings
1 Synaptomys borealis (Richardson, 1828) - northern bog lemming
2 Synaptomys cooperi Baird, 1857 - southern bog lemming