Unicoloured Cross Frog

The type series consists of two males, measuring about 29 mm (1.1 in) in snout–vent length, and a sub-adult female, measuring 24 mm (0.94 in). The dorsal colour is greenish or brownish and uniform, in contrast to most other Oreophryne species that bear large spots. Ventral surface is whitish. Tympanum is nearly invisible. Fingers have large discs; toes have smaller discs and basal webbing. Males call most actively in early evening. The call is a series of monotonous high-pitched whistles or beeps.

Natural habitat of Oreophryne unicolor is tropical rainforest at elevations of 500–900 m (1,600–3,000 ft) asl. They are hard to find as males typically call from perches 3–6 metres above the ground. Threats to it are unknown. Its range might include the Wondiwoi Nature Reserve.

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