Type locality: Barabinsk steppes Govt. Tomsk, Siberia.
Notes: Large, orthodont, and aquatic water voles. Arvicola terrestris variabilis Ognev, 1933, is preoccupied by Arvicola arvalis form variabilis Rörig et Börner, 1905 (now a junior synonym of Microtus arvalis) and was renamed Microtus terrestris barabensis Heptner, 1948. This name (sensu Gromov and Erbajeva 1995) is applicable to our samples from Russia (pts. 27–29 on Figure 1).