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We report a new locality record for the Mehuín Green Frog, Insuetophrynus acarpicus Barrio, 1970, a Critically Endangered species from southern Chile. The new locality is about 90 km southeast of the type locality and expands the known geographical distribution 40 km to the southeast. The new record confirms the presence of I. acarpicus south of the Lingue and Valdivia rivers. Our documentation demonstrates a discontinuous distribution of this frog in the Valdivian Coastal Range of Chile and intensifies the need to implement effective strategies for its conservation.

A new population of the Critically Endangered anuran species Insuetophrynus acarpicus Barrio, 1970 was discovered during a field survey at Valdivian Coastal Range, Los Ríos Region, Southern Chile. Until now, only three populations have been reported for the species. The new founding described in this paper, which extends the latitudinal limit 21 km to the southwest, and its altitudinal range over 486 m a.s.l, constitutes a very important discovery since the species is considered one of the most threatened species in the country and the world.