Phrynopus kauneorum was described as a medium-sized species with snout-vent length up to 32.3mm in females. Further adult female specimens of P. kauneorum, collected near the type locality (palma Pampa, Provincia Pachitea, Departamento Huanuco, Peru) show that it is a large species with a snout-vent length up to 56.4mm and the largest known species of the genus. P. kauneorum has an altitudinal distribution of 2 735-3 380m and is known from two localities in the yungas ecoregion of the eastern Andes of Peru. One adult female contained 56 eggs with an average diameter of 3.31±0.35mm (n=10). Osteological data of the terminal phalanges and the skull are presented. Phrynopus kauneorum, which is most similar to P. juninensis, is a rare species endangered by habitat destruction and pollution.