 Its closest living relatives appear to be "O. chloronota" which occurs to the north of Hose's frog's range, as well as "O. livida" and "O. morafkai" with a more limited range in Myanmar and Vietnam, respectively; these four appear to form a close-knit group wherein the northern species are barely closer to each other than Hose's frog is to any of them.Also quite closely related is "O. megatympanum", another Vietnamese endemic.This frog has a robust body with long, slender legs; males measure 50–60 mm, females 85–100 mm.