This species from south-eastern Brazil has been recorded from the states of Rio de Janeiro, Espirito Santo, and extreme south-eastern Minas Gerais. Its altitudinal range is 200-800m asl.
Habitat and Ecology
It lives on wet rock walls near streams in forest, or on the forest edge. The egg clutch is deposited in rock fissures, while the larvae live on wet rock walls where water drains.
It is very rare, and has undergone precipitous declines. The records from Espirito Santo are very old, and it has not been seen in Rio de Janeiro for 20 years, despite searches. There are some recent records from Minas Gerais, in Parque Nacional do Caparao, these being the only recent records of the species.
The major threats are probably related to habitat loss due to human settlement, tourist activities and fire. However, the reasons for the observed dramatic declines remain unexplained; like amphibians in some other parts of the wet tropics, it appears to have disappeared from areas of apparently suitable habitat, and chytridiomycosis cannot be ruled out as a threat, despite the fact that this pathogen has not yet been confirmed from Brazil.
It occurs in Parque Nacional do Caparao, and has also been found in Parque Nacional da Tijuca in Rio de Janeiro, although there are no recent records. Further survey work is required to determine the current population status of this species, and further research is needed into the reasons for the decline of this species in suitable habitat.
Sergio Potsch de Carvalho-e-Silva, Ana Carolina Carnaval 2004. Thoropa lutzi. In: IUCN 2014