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SUPPLEMENTAL DATA鈥擲upplemental materials are available for this article for free at


C. Ji and P.-F. Yang provided help with the photographs. T.-F. Hu prepared part of the specimen. Projects 41372016, 40920124002, and 40672002 were supported by the National Natural Science Foundation of China. Editor R. O鈥橩eefe, reviewer J. Neenan, and an anonymous reviewer offered very helpful suggestions and comments.

Handling editor: Robin O'Keefe.