This species is known from two areas in the Pacific lowlands of Colombia and Ecuador: around the type locality, Río Anchicayá, in Valle Department, Colombia, at 300m asl; and Puerto Quito, in Pichincha Province, Ecuador. It will presumably be found to occur more widely, at least in the area between the two known sites. Its overall altitudinal range is 100-500m asl.
Habitat and Ecology
It inhabits lowland moist forest, and is found only in mature forest. The eggs are placed on leaves overhanging slow-flowing streams and ponds, into which the larvae fall and develop.
It is a rare species.
The major threats to this species are likely to be deforestation for agricultural development (including plantations), illegal crops, logging, and human settlement, and pollution resulting from the spraying of illegal crops.
It is not known to occur in any protected areas.
This species was previously within the genus Phyllomedusa but has recently been moved to the genus Hylomantis (Faivovich et al. 2005).
Wilmar Bolívar, Karl-Heinz Jungfer, Juan Manuel Renjifo 2004. Agalychnis psilopygion. In: IUCN 2014