ASAKAWA Mitsuhiko Rakuno Gakuen University School of Veterinary Medicine, Department of Parasitology, Associate Professor, 獣医学部, 助教授 (30184138)
HARADA Masashi Osaka City University Medical School, Laboratory Animal Center, Associate Professor, 医学部, 助教授 (20117964)
ODA Sen-ichi Nagoya University Graduate School of Bio-Agricultural Sciences, Laboratory of Animal Management, Associate Professor, 農学部, 助教授 (60023660)
To analyze the origin and evolution of Japanese small mammals, we studied morphological, cytogenetical, molecular, biochemical, and parasitological data sets. There are many candidates that represents the derivatives of the ancestral species that came through the "Himalayan Corridor" to Japan. Among them, the species complex of Japanese Microtus montebelli and its allies, M..kikuchii from Taiwan, M.oeconomus from Russia, and M.sikimensis from Nepal, is one of the most suitable species for the study. Morphological, karyological, and parasitological findings confirms a close relation between M.montebelli, M.oeconomus, and M.kikuchii. This conclusion also denies the origin of M.montebelli from M.arvalis or M.fortis. Other species of Japanese small mammals also studied and discussed from various points of view through this study.