Microtus sachalinensis Vasin, 1955 . Zool. Zh., 34:427.

TYPE LOCALITY: Russia, Sakhalin Island, Poronaysk region, Olen River .

DISTRIBUTION: An endemic of Sakhalin Island.

COMMENTS: Subgenus Alexandromys, middendorffi species group sensu Zagorodnyuk (1990) . Reviewed by Corbet (1978c) and Gromov and Polyakov (1977).