This species is known only from around the type locality, Mehuin, Valdivia Province, Chile. It has not been found elsewhere, despite survey work. Its altitudinal range is from 50-200m asl.
Habitat and Ecology
It occurs in small streams and under stones in temperate forest. At night, it feeds on the margins of streams. Breeding takes place in streams, and the species is characterized by free-swimming tadpoles.
It is locally common, and was last recorded in 2003.
It is threatened by habitat destruction resulting from clear cutting and afforestation with pine plantations.
It does not occur in any protected area, and there remains a need for much improved protection and maintenance of the Valdivian temperate forests in its range. The status of this species should be closely monitored.
Alberto Veloso, Herman Núñez, Jose Núñez, Ramón Formas 2010. Insuetophrynus acarpicus. In: IUCN 2014