1. Department of Biological Sciences, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
2. The University Museum, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan (e-mail: )
3. 4-59 Uwamachi, Yokosuka, Kanagawa 238-0017, Japan
4. School of International Liberal Studies, Waseda University, 1-6-1 Nishi-Waseda, Shinjuku, Tokyo 169-8050, Japan
5. Archaeological Museum, Waseda University, 1136 Nishitomida, Honjo, Saitama 367-0035, Japan