The Mehuín Green Frog (Insuetophrynus acarpicus), from Chile, is widely considered one of the most endangered frogs still alive in the wild.
The Mehuín Green Frog (Insuetophrynus acarpicus) is only found in Chile. The species used to range through a greater portion of the coastal mountains of Chile but now is only found in several small sections of isolated streams. This is one of the most endangered of South America’s amphibians. The IUCN lists the species as “CR” or critically endangered. Critically endangered means that the species likely to go extinct. The species lives in and around rocks and logs in streams, often spending time beneath the water and below rocks. The tadpoles of this species have a clear ventral surface through which all of their internal organs can be viewed. This specimen was photographed in coastal Chile and is one species on which a collaborative conservation effort between the San Antonio Zoo and the National Zoo of Chile in Santiago is focused.
Insuetophrynus is a monotypic genus of frogs in the Rhinodermatidae family. The sole species is Insuetophrynus acarpicus, also known as Barrio's frog. It is endemic to Chile and only known from few localities on the Valdivian Coast Range between Chanchán in the Los Ríos Region in the south and Queule (southernmost Araucanía Region) and Colequal Alto in the north; the fourth locality is Mehuín, which is the type locality. The altitudinal range is 50–486 m (164–1,594 ft) asl.