Description

The body of this species is relatively robust. The canthus is blunt, and the tympanum is circular. There are 4-5 vomerine teeth. The webbing is well developed, and the tips of the fingers and toes are slightly dilated. The skin on the back of this frog has small granules. The dorsolateral fold is prominent, and is found protruding outwards above the tympanum. The supratympanic fold is also evident. The mean snout to vent length for males is 45 mm (range 38-56), and for females it is 51 mm (range 43-60). There is no vocal sac or opening. Males have nuptial pads that are grayish-yellow or yellow. Breeding males have skin folds on the flanks and the backs of their thighs.

R. sakuraii is sometimes sympatric with R. tagoi, but seems completely isolated reproductively by differences in season and site of breeding as well as male calling behavior.