Rana erythraea is sexually dimorphic, with adult females reaching a maximum size of 78 mm SVL, and males reaching a maximum of 48 mm in SVL (Brown and Alcala 1970). Dorsal coloring varies from light to dark green and the ventral side is generally whitish, although blue morphs have also been reported (as for some other species of ranids; see Berns and Uhler 1966, and the Comments section below). R. erythraea has cream colored dorso-lateral folds that are sometimes bordered with black. Limbs are yellowish with irregular spotting. This species has smooth skin, and long, free fingers that dilate into minute discs with grooves. It has long hindlimbs. The inner metatarsal tubercle is present, but the outer metatarsal tubercle is absent (Inger and Stuebing 2005). Males are much smaller than females (Iskandar 1998), and breeding adult males have velvety yellow nuptial pads on the first finger, extending from the wrist to the end of the first metacarpal (Inger and Greenberg 1963).