1. Division of Glacier & Earth Sciences, Korea Polar Research Institute, 26 Songdomirae-ro, Yeonsu-gu, Incheon 21990, Republic of Korea & Polar Science, Korea National University of Science and Technology, Daejeon 34113, Republic of Korea;
2. Department of Earth Sciences (Palaeobiology), Uppsala University, Villavägen 16, SE-752 36 Uppsala, Sweden;
3. Geological Survey of New South Wales, WB Clarke Geoscience Centre, 947-953 Londonderry Road, Londonderry, NSW 2753, Australia;
4. Palaeontology Department, Australian Museum Research Institute, Sydney, New South Wales, 2010, Australia & Department of Biological Sciences, Macquarie University, Sydney, New South Wales, 2109, Australia;
5. Division of Glacier & Earth Sciences, Korea Polar Research Institute, 26 Songdomirae-ro, Yeonsu-gu, Incheon 21990, Republic of Korea;