A new species of terrestrial-breeding frog (Amphibia, Craugastoridae, ) from high elevations of the Pui Pui Protected Forest in central Peru.

We describe a new species of from upper montane forests and high Andean grasslands of the Pui Pui Protected Forest and its close surroundings, Región Junín, central Peru. The description of the new species is based on 34 specimens found at elevations between 3400 and 3936 m a.s.l. is characterized by a snout-vent length of 14.6-19.2 mm in adult males (n = 21), 19.2-23.0 mm in adult females (n = 10), and is compared morphologically and genetically with other taxonomically and biogeographically relevant species of . The new species is characterized by having narrow digits that lack circumferential grooves, irregularly shaped, discontinuous dorsolateral folds, and absence of both tympanic membrane and tympanic annulus. The high similarity in morphology between and members of the Andean genera and provides an example for convergent evolution, and highlights the importance of using molecular data to justify generic assignment. is most similar to from the Región Junín, suggesting that the generic placement of this species needs to be revised. Phylogenetically the new species belongs to the species Group, a clade that includes several species distributed in the montane forests of central Peru, including , , , and .