Microtus transcaspicus Satunin, 1905 . Izv. Kavkas. Mus., 2:57.

TYPE LOCALITY: Turkmenistan, Kopet Dag Mtns, Chuli Valley, near Ashkhabad .

DISTRIBUTION: S Turkmenistan, N Afghanistan, and N Iran.

SYNONYMS: khorkoutensis.

COMMENTS: Subgenus Microtus, arvalis species group sensu Zagorodnyuk (1990) . Taxonomy reviewed by Gromov and Polyakov (1977), Corbet (1978c), Malygin (1978), Meier et al. (1981), and Meier (1983).