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Additional Information

Competing Interests

The authors declare that they have no competing interests.

Author Contributions

Michael Pittman conceived and designed the experiments, performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Rui Pei performed the experiments, analyzed the data, wrote the paper, reviewed drafts of the paper.

Xing Xu conceived and designed the experiments, performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, reviewed drafts of the paper.

Field Study Permissions

The following information was supplied relating to field study approvals (i.e., approving body and any reference numbers):

IVPP V22530 was collected, studied and described using standard palaeontological methods, in accordance with a fossil excavation permit (13-07-ELT) obtained from the Department of Land and Resources, Nei Mongol, China.

Funding

The collection and study of IVPP V22530 was supported by funds awarded to XX by the National Science Foundation of China (41120124002). Study of IVPP V22530 was also supported by funds awarded to MP by the Research Grant Council’s General Research Fund (17103315). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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