Pelophryne rhopophilia has rarely been collected and documented. According to Inger et al. (2015), this species seems restricted to southeastern Sarawak (Bukit Lanjak) and adjacent West Kalimantan. Males are in the range of 21-24 mm snout-vent length, females are up to 23 mm. The body is slender. Finger tips are truncate. The dorsal background color is dark brown with ligher areas forming a X shape on back of trunk. There is a quite sharp line between the dark parts dorsally and the white or cream belly. The belly is not completely white or cream, but bears black spots. The skin is warty and larger warts may be red. Warts bear a small keratine spine. The fingers are truncate and the webbing is fleshy.