[2] Austrochaperina adamantina was described based on a single specimen, which is an adult female measuring 28 mm (1.1 in) in snout–vent length.

The tympanic ring is barely visible; a weak supratympanic fold is present.

There is a well-defined paler area on the side of face, from the upper lip from just below nostril to the tympanic fold.

[2] Austrochaperina adamantina has been recorded from elevations between 340–1,550 m (1,120–5,090 ft) above sea level (the upper limit is imprecise and could be lower).

[1][2][4] Its ecological requirements are unknown but it is presumably a forest inhabitant that breeds by direct development (i.e, there is no free-living larval stage[5]), as its congeners.