Microtus richardsoni (DeKay, 1842)

James H. Honacki, Kenneth E. Kinman & James W. Koeppl, 1982, Order Rodentia (Part 4), Mammal Species of the World (1 st Edition), Lawrence, Kansas, USA: Alien Press, Inc. & The Association of Systematics Collections, pp. 477-504 : 497

Microtus richardsoni (DeKay, 1842) . Zoology of New York, Part I, Mammals, p. 91.

REVIEWED BY: M. L. Johnson (MLJ).

TYPE LOCALITY: Canada, Alberta, vic. Jasper House, "Near the foot of the Rocky Mountains."

DISTRIBUTION: N. Rocky Mtns., from S. British Columbia and S. W. Alberta ( Canada) to C. Wyoming and Utah, and in Cascade Mtns, from S. British Columbia, south through Oregon ( U.S.A.).

COMMENT: Allocated by Hooper and Hart, 1962, Misc. Publ. Zool. Univ. Mich. Mus., No. 120, 68 pp., Jannett, 1974, Am. Midi. Nat., 92:230- 234, Corbet and Hill, 1980:161, and others to Arvicola ; Chaline and Mein, 1979, Repenning, 1979, Abstr. Pap. Geol. Soc. Am., and Martin, R. A., 1979, Evol. Monogr., 2: 30, considered this vole to have arisen in North America and to belong in Microtus (Aulacomys) (MLJ, CAR). The development of the highly derived molar enamel pattern found in this form requires an early immigration and long independent history; a separate derivation from Allophaiomys seems more likely (LDM).

ISIS NUMBER: 5301410008069001001 as Arvicola richardsoni .