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We describe a new species of small strabomantid frog (genusPsychrophrynella) from a humid montane forest in the Peruvian Department of Puno. Specimens were collected at 2,225 m a.s.l. in the leaf litter of primary montane forest near Thiuni, along the Macusani-San Gabán road, in the province of Carabaya. The new species is assigned toPsychrophrynellaon the basis of morphological similarity, including presence of a tubercle on the inner edge of the tarsus, and call composed of multiple notes. We also include genetic distances for 16S rRNA partial sequences between the new species and other strabomantid frogs. The species with lowest genetic distances arePsychrophrynella chirihampatuandPsychrophrynella usurpator. Psychrophrynella glaucasp. n. is readily distinguished from the three other species ofPsychrophrynella(Psychrophrynella bagrecito,P. chirihampatu, andP. usurpator) by its small size, and by having belly and ventral surfaces of legs reddish-brown or red, and chest and throat brown to dark brown with a profusion of bluish-gray flecks. The new species is only known from its type locality. With the discovery ofP. glauca, the geographic distribution ofPsychrophrynellais extended to the Department of Puno, where it was no longer represented after the description of the genusMicrokayla. Furthermore, the Cordillera de Carabaya is the only mountain range known to be home to four of the seven genera of Holoadeninae (Bryophryne,Microkayla,Noblella, andPsychrophrynella), suggesting an intriguing evolutionary history for this group in southern Peru.
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Montane, Evolution, Forest, Frog, Peru, Amphibian
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