1. 2-20-13, Kamiogi, Suginami-ku, Tokyo 167-0043, Japan (e-mail; )
2. Vietnam Institute of Geosciences and Mineral Resources, 67 Chien Thang street, Ha Dong, Hanoi, Vietnam
3. Natural History Museum Luxembourg, Department of Palaeontology, 25 rue Münster, 2160 Luxembourg City, Luxembourg
4. Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto 860-8555, Japan
5. Vietnam National Museum of Nature, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Hanoi, Vietnam
6. National Museum of Nature and Science, 4-1-1, Amakubo, Tsukuba, Ibaraki 305-0005, Japan