1. 1State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, 39 East Beijing Road, Nanjing 210008, China
2. 2University of the Chinese Academy of Sciences, Beijing 100049, China
3. 3Guangxi Institute of Geological Survey, No. 21 North Yuanhu Road, Nanning 530023, China
4. 4Department of Earth Sciences, The Natural History Museum, Cromwell Road, London SW7 5BD, UK
5. 5Division of Entomology, Natural History Museum, University of Kansas, 1501 Crestline Drive, Suite 140, Lawrence, Kansas 66045-4415, USA
6. 6Department of Ecology and Evolutionary Biology, University of Kansas, Lawrence, Kansas 66045-4415, USA
7. 7Division of Invertebrate Zoology, American Museum of Natural History, Central Park West at 79th Street, New York, New York 10024-5192, USA