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In page Cardioglossa melanogaster:

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Males measure 25–30 mm (1.0–1.2 in) and females 27–34 mm (1.1–1.3 in) in snout–vent length.[1] Males have extremely long third fingers and spines in the fingers and in the groin; females lack these characteristics.[2] The dorsum and flanks show distinctive tan and black patterning. The pupil is vertical and iris is gold.[3] The white line running under the tympanum continues beyond the eye.[4]