ACKNOWLEDGMENTS
We thank all the workers and volunteers who participated in the excavation at the Phu Noi site, as well as the preparator of the specimen studied here. The research was supported by a Grant from the Thailand Research Fund (TRF) for new researcher (MRG 6180086) to U.D. We also thank reviewers A. Clement and T. R. Smithson for their constructive comments, as well as A. López-Arbarello, T. Argyriou, and J. Harris for their editorial assistance.