The dorsum, flanks, and upper surfaces of the limbs are covered with many small, low, rounded warts that give the skin a velvet-like appearance.

The warts on the dorsum, head, and limbs terminate in a single fine, keratinous spine.

Based on morphological and ecological differences, they conclude that the two are separate species, although lack of tissue samples from A. echinata means that this question could not be settled with molecular methods.

[1][3] Both known specimens were found at night, just below the summit ridge of the Gunung Murud massif at 2,152 m (7,060 ft) above sea level.

They were resting on the leaves of lower vegetation a few meters from a small stream in undisturbed, mossy montane forest.