20071210121900.0 0368-2188 Journal of the Faculty of Science, Hokkaido University. Series 6, Zoology Journal of the Faculty of Science, Hokkaido University. Series 6, Zoology Japan 0368-2188 0368-2188 Journal of the Faculty of Science, Hokkaido University. 0368-2188 Journal of the Faculty of Science, Hokkaido University. 0368-2188