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Reishi Takashima
Department of Natural History Sciences, Faculty of Science, Hokkaido University
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Rodolfo Coccioni
Istituto di Geologia e Centro di Geobiologia, Universita' degli Studi “Carlo Bo”
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Hiroshi Nishi
Department of Natural History Sciences, Faculty of Science, Hokkaido University
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Keiichi Hayashi
Department of Natural History Sciences, Faculty of Science, Hokkaido University