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Abstract
Eastern and western populations of the ranid frog Odorrana chapaensis from Vietnam and China are readily differentiated by morphology and mtDNA, and weakly differentiated by morphometrics. The western population contains the type localities of O. chapaensis and its junior synonym Amolops macrorhynchus. The eastern population is described as a new species, characterized by a combination of males with snout–vent length 71–79 mm, females 87–100 mm; head length greater than head width; relative finger length I ≤ II <>