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The diversity of Palaearctic chipmunks was analysed using a set of morphological (705 skulls from entire range) and genetic features (144 specimens, cytochrome b gene). Based on the results, we propose three taxa within Eutamias sibiricus . These are E. s. sibiricus , inhabiting Russia, the extreme northeast of the Korea Peninsula, Mongolia, Hokkaido Island, and northeast China; E. s. barberi , inhabiting the Korea Peninsula except for the extreme northeast region, and E. s. senescens , inhabiting central China.
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Obolenskaya et al. (2009) studied this question.
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