This species occurs in the Serra do Mar in the southeastern part of the state of Rio de Janeiro and the northern half of the state of São Paulo, including the offshore islands of Ilha Grande and São Sebastião. It occurs up to 800m asl. It is no longer known from the type locality, Boracéia, where some other species have also declined or disappeared in suitable habitat.
Habitat and Ecology
This species is common on the wet rocky faces of small streams in primary and secondary forest. Larvae were collected from the wet seeping rock walls. It has not been collected outside forest.
It is a common species. There is no longer a population at Boracéia (it was last recorded there in 1988), but it has not been observed to decline elsewhere. This decline is reminiscent of disappearances of stream-breeding, high-altitude frog species in other parts of the wet tropics.
Habitat loss due to infrastructure development for human settlement is a major threat, and this is even taking place in some protected areas, even though illegal. However, it appears that the species might also have experienced an unexplained decline in an area of apparently suitable habitat in a higher altitude part of its range. Such a decline is potentially ominous, and chytridiomycosis cannot be ruled out.
The range of the species includes several protected areas. Improvement of law enforcement within protected areas to prevent habitat loss due to infrastructure development is needed. More research into the species' Extent of Occurrence is needed.
Sergio Potsch de Carvalho-e-Silva, Bruno Pimenta 2004. Cycloramphus boraceiensis. In: IUCN 2014