This species is known only from the type locality in the Serra do Mar, in the state of São Paulo, Brazil. It most probably occurs elsewhere along this mountain range but no sampling has been carried in the potential range. The known locality is at around 800m asl.
Habitat and Ecology
This diurnal species presumably occurs in small rivulets in the Serra do Mar mountains. The known locality is good secondary forest. No information is known about this species' breeding habits, but it presumably breeds in the small rivulets and the larvae develop in streams, as with other species in the genus.
The population is unknown and it is presently only known from a few specimens.
Its threats are unknown, but the known locality is within a protected area, affording its habitat some protection. There was some logging of the area in the past, and air pollution was also a past threat.
The type locality is in Parque Estadual da Serra do Mar.
Red List Status
Data Deficient (DD)
Listed as Data Deficient in view of continuing uncertainties as to its extent of occurrence, status and ecological requirements.
Carlos Frederico da Rocha, Monique Van Sluys, Carlos Alberto Gonçalves da Cruz 2004. Hylodes mertensi. The IUCN Red List of Threatened Species 2004: e.T57095A11570630. http://dx.doi.org/10.2305/IUCN.UK.2004.RLTS.T57095A11570630.en .Downloaded on 17 January 2019