The eastern broad-toothed field mouse Apodemus mystacinus (Danford and Alston, 1877) has been reported from the Levant, some Aegean islands, Anatolia, the southern Caucasus and North Iraq. In this study, 15 specimens of A. mystacinus were recorded from the Zagros Mountains, north-western Iran. Four external features, 13 linear measurements of the skull and 14 dental characters were measured. Dental and cranial characters were evaluated based on the frequencies of 27 character states for 12 morphological characters. The oak forests of the north-western slopes of the Zagros Mountains are known as the easternmost range boundary of A. mystacinus, and the species has been blocked by the north-south extension of the Zagros Mountains. Based on morphological and morphometric characters, we suggest that the population of A. mystacinus from the Zagros Mountains possibly belongs to a new subspecies but this issue requires further analyses.

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