1. Department of Chemistry, Biology and Marine Science, University of the Ryukyus, Nishihara, Okinawa 903-0213, Japan
2. Department of Fisheries and Marine Science, Nusa Utara Polytechnic, Tahuna Sangihe Islands, North Sulawesi 95812, Indonesia
3. Department of Marine Sciences, Diponegoro University, Tembalang-Semarang, Central Java 50275, Indonesia
4. Naturalis Biodiversity Center, P. O. Box 9517, 2300 RA Leiden, The Netherlands