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 Clethrionomys Tilesius, 1850 - red-backed mice
Clethrionomys californicus (Merriam, 1890) - western red-backed vole