A new cryptic species of terrestrial breeding frog of the Group (Anura, Strabomantidae) from montane forests in Ayacucho, Peru.

Based on morphological and molecular characters, we describe a new species of terrestrial breeding frog of the Group from montane forests of La Mar Province, Ayacucho Department in southern Peru, at elevations from 1200 to 2000 m a.s.l. The phylogenetic analysis, based on concatenated sequences of gene fragments of 16S rRNA, RAG1, COI and TYR suggests that the new species is a sister taxon of a clade that includes one undescribed species of from Cusco, and . The new species is most similar to , which differs by lacking scapular tubercules and by its smaller size (17.0-18.6 mm in males [n = 5], 20.8-25.2 mm in females [n = 5] in the new species vs. 22.8-26.3 mm in males [n = 19], 26.0-31.9 mm in females [n = 30] of ). Additionally, we report the prevalence of (Bd) in this species.