ZHAO, Fangchen, State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, 39 East Beijing Road, Nanjing, 210008, China, fczhao@nigpas.ac.cn, BOTTJER, David J., Department of Earth Sciences, University of Southern California, Los Angeles, CA 90089, CARON, Jean-Bernard, Natural History (Paleobiology Section), Royal Ontario Museum, 100 Queen's Park, Toronto, ON M5S2C6, Canada, ZHU, Maoyan, LPS, Nanjing Institute of Geology and Palaeontology, 39 East Beijing Road, Nanjing, 210008, China, and HU, Shixue, Chengdu Institute of Geology and Mineral Resources, No. 2, N-3 section, 1st Ring Road, Chengdu, 610081, China