1 State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, and Centre for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Nanjing, China.
2 School of Earth Sciences, University of Bristol, Life Sciences Building, Bristol, UK.
3 State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, and Centre for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Nanjing, China. cycai@nigpas.ac.cn.
4 School of Earth Sciences, University of Bristol, Life Sciences Building, Bristol, UK. cycai@nigpas.ac.cn.