Geographical distribution of Polycelis (Seidlia) auriculata in Japan |
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Authors: | Masaharu Kawakatsu Tatsuya Yamada Hitoshi Murayama Yôzô Naoki |
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Institution: | (1) Biological Laboratory, Fuji Women's College, Kita-16, Nishi-2, 001 Kita-ku, Sapporo (Hokkaidô), Japan;(2) Ônohara 272-2, 368 Chichibu, Saitama Prefecture, Japan;(3) Nakazawa-machi 4-301-2, 940 Nagaoka, Japan;(4) Mukainakano High School, Saikawa 2-3, 020 Mukainakano, Morioka, Japan |
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Abstract: | Polycelis (Seidlia) auriculata is endemic to mountain districts of Japan, from the central part of Honshû to the area of the Daisetsu Mts of Hokkaidô. In northern Japan, it sometimes occurs in cold-water biotopes of lowland areas. The progenitor of P. auriculata appears to have been the oldest immigrant into northern Japan among the Japanese Polycelis species, entering through a northern route as a preglacial faunal element. P. auriculata now shows a discontinious distribution in northern Japan. By virtue of its geographical and vertical distribution, ecological niche, variation in anatomy of the copulatory apparatus, and cytodemes, this species appears to be in the process of transformation. |
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Keywords: | Turbellaria Tricladida Polycelis Seidlia distribution Japan |
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