This species is known only from the western versant of the Cordillera Azul, Huánuco Department, Peru, where it has been observed between 1,650 and 1,800m asl.
Habitat and Ecology
The general habitat in the area of collection is humid mountain forest. It is presumed to be a stream-breeding species.
It is currently known only from museum specimens, and was last recorded in 1980.
The threats to the species within its range on the Cordillera Azul have not been recorded. However, like other members of its genus, it is assumed to be at severe risk from chytridiomycosis.
It is not known to occur in any protected areas. In view of the likely threat of chytridiomycosis, it is a very high priority to conduct surveys to locate this species and determine its current population status; a captive-breeding programme may also need to be established.
Red List Status
Listed as Endangered because of a projected population decline, estimated to be more than 50% over the next ten years, inferred from declines in other high altitude Atelopus species in the same region, probably due to chytridiomycosis.
Stefan Lötters 2004. Atelopus dimorphus. The IUCN Red List of Threatened Species 2004: e.T54503A11152536. http://dx.doi.org/10.2305/IUCN.UK.2004.RLTS.T54503A11152536.en