Identification and Some Morphological Characters of Clethrionomys rufocanus and Eothenomys regulus from USSR, Northeast China, and Korea in Comparison with C. rufocanus from Finland

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Museum specimens of 210 red-backed voles from USSR, northeast China (Manchuria), and Korea were compared with 70 specimens of Clethrionomys rufocanus from Finland. Condylobasal length (CBL) correlated positively with ages determined by developmental stages of molar roots in the samples from Finland throughout the year. All skulls measuring CBL = 26 mm or more had roots in the samples collected from Finland in the first half of the year. In the Asiatic specimens collected in the first half of a year and from 41°N latitude and north (northern voles), all skulls with 26 mm CBL or more lacked alveolar capsules, indicating the development of roots. On the other hand, in museum specimens collected in the first half of the year and from 41°N latitude and south (southern voles), all skulls, even in skulls with 26 mm CBL or more, had strongly bulged alveolar capsules, indicating rootless molars. The occlusal patterns of M3 change with increase in CBL were the same between C. rufocanus from Finland and northern voles: simplex form was common in larger individuals, whereas the complex form was rare. On the other hand, the complex form was abundant in all CBL classes in southern voles. Northern voles were slightly narrower in interorbital width and slightly shorter in tail length than southern ones. I identified the northern vole as C. rufocanus, and the southern vole as Eothenomys regulus. I suggest that the true geographical demarcation line between the two species lies on the western and southern boundary of the Kaima Plateau, North Korea.
Mammalogical Society of Japanの論文

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金子之史
香川大・教育・生物

Identification and Some Morphological Characters of Clethrionomys rufocanus and Eothenomys regulus from USSR, Northeast China, and Korea in Comparison with C. rufocanus from Finland

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