Ophryophryne pachyproctus Kou, 1985, Acta Herpetol. Sinica, Chengdu, N.S.,, 4 (1): 41. Holotype: YU A8311032, by original designation. Type locality: "Zhushihe, Mengla County, Yunnan Province, alt. 1000 m", China.
Megophrys (Ophryophryne) pachyproctus — Yang, 1991, Amph. Fauna of Yunnan: 66.
Zhushihe Mountain Toad (Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 86).
Mengla Narrow-mouthed Horned Toad (Fei, 1999, Atlas Amph. China: 124).
Mountain Toad (Nguyen, Ho, and Nguyen, 2005, Checklist Amph. Rept. Vietnam: 15).
Region of the type locality in Yunnan, southwestern China and northern Vietnam (Nghe An and Ha Tinh provinces) and reported in northern and eastern Laos.
If (following Dubois, 1980, Bull. Mens. Soc. Linn. Lyon, 49: 469-482) Ophryophryne is considered a subgenus of Megophrys, Ophryophryne pachyproctus Kuo, 1985, becomes a secondary homonym of Megophrys pachyproctus Huang, 1981. Closely related to Ophryophryne microstoma according to the original publication. See accounts by Yang, 1991, Amph. Fauna of Yunnan: 66-67; Ye, Fei, and Hu, 1993, Rare and Economic Amph. China: 178; and Fei, 1999, Atlas Amph. China: 124-125. See comments by Inger, Orlov, and Darevsky, 1999, Fieldiana, Zool., N.S.,, 92: 8-9. Secondary homonym of Megophrys pachyproctus Huang, 1985, when in Megophrys. Orlov, Murphy, Ananjeva, Ryabov, and Ho, 2002, Russ. J. Herpetol., 9: 84, noted reports of this species in Laos. See account by Ohler, 2003, Alytes, 21: 34-39, who did not report this species from Laos. Nguyen, Ho, and Nguyen, 2005, Checklist Amph. Rept. Vietnam: 16, provided specific localities for Vietnam. Bain, Nguyen, and Doan, 2007, Herpetol. Rev., 38: 111, provided a record for Ha Tinh Province, Vietnam, and briefly discussed the range. Fei, Hu, Ye, and Huang, 2009, Fauna Sinica, Amph. 2: 477-481, provided an account for China and spot map. Fei, Ye, and Jiang, 2010, Colored Atlas of Chinese Amph.: 217, provided a brief account including photographs.
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