1. Department of Biological Sciences, Kanagawa University, 2946 Tsuchiya, Hiratsuka, Kanagawa 259-1293, Japan (e-mail: neritopsis@gmail.com)
2. 2-20-63 Hime-cho, Tajimi, Gifu 507-0061, Japan
3. Department of Earth and Environmental Sciences, Graduate School of Environmental Studies, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan
4. Visiting Research Fellow, Kanagawa Prefectural Museum, 499 Iryuda, Odawara, Kanagawa 250-0031, Japan