This holotype was collected by Dr. Wen-Hao Chou, Senior Curator of Herpetology, NMNS, and his colleague, Mr. Yu.-Bo Huang, from a tropical forest in central Vietnam. It was named after Professor Pao-Teh Han, the founding Director of NMNS. Two paratypes are currently deposited in IEBR Vietnam and the American Museum of Natural History, New York, respectively. This specimen remarks a significant international collaboration of expedition to Vietnam in 1990s.