1. Laboratory of Marine Biology, Faculty of Science, Kochi University, 2-5-1 Akebono-cho, Kochi 780-8520, Japan; Email: (MS) maosato.jour@gmail.com; and (KS) fishssk@kochi-u.ac.jp. Send reprint requests to MS.
2. Department of Zoology, National Museum of Nature and Science, 4-1-1, Amakubo, Tsukuba-shi, Ibaraki 305-0005, Japan; Email: nakae@kahaku.go.jp.