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A small frog, 25-30 mm, in some populations (e.g., Andasibe) smaller than in others (e.g., Nosy Mangabe). Tibiotarsal articulation reaches nostrils or tip of snout. Hand without webbbing, foot with rudimentary webbing. Inner metatarsal tubercle relatively small and pigmented. Dorsal skin granular without ridges. Colouration very variable, with a predominance of dark brown. Upper lip without continuous white band. Males with distinct femoral glands and blackish paired subgular vocal sacs.
Similar species: All other species of the subgenus Gephyromantis. G. boulengeri is recognized by lacking any dorsal ridges and instead having a rather granular skin.
Taken with permission from Glaw and Vences (2007).