This species occurs in the western Amazon basin and on the lower Amazonian slopes of the Andes at 100-800 m asl. It has been recorded from Ecuador (Napo and Pastaza provinces) and eastern Peru (regions of Amazonas, Loreto and Madre de Dios). It possibly occurs in the Putumayo and Amazonas departments of Colombia (Lynch 1999, Acosta-Galvis 2000) and it is suspected to occur in Bolivia (De la Riva et al. 2000).
Habitat and Ecology
It is a subterranean species of primary tropical rainforest. At Lago Agrio, Ecuador, individuals were found during clearance of primary forest by bulldozers (Duellman 1978). It is not known whether it can adapt to modified habitats. Its breeding habits are unknown.
There is no information on threats to this species. It occurs in an area of low human impact, and so it is unlikely to be significantly threatened.
In Ecuador this species has been recorded from Yasuní National Park, and it possibly also occurs in Limoncocha Biological Reserve. It might occur in the Allpahuayo Mishana National Reserve, although this needs confirmation. Further research is needed into its distribution, population status and trends, ecology and threats.
IUCN SSC Amphibian Specialist Group 2014. Oscaecilia bassleri. In: IUCN 2014