Nymphargus wileyi is only known from the type locality, Yanayacu Biological Station (0 41′ S, 77 53′ W; 2100 masl), Province of Napo, Ecuador (Guayasamin et al., 2006).
Habitat and Ecology
The species inhabits primary cloud forests. Individuals can be found at night on leaves 120–220 cm above streams (males) or above the ground (one female). Three males were found near egg clutches, which were on the tip of leaves; males were never found in the same leaf as the egg clutches, suggesting that males do not guard the eggs. The number of eggs per clutch varies from 19-28; eggs are whitish as well as embryos in early developmental stages. Males call from the upper side of leaves (Guayasamin et al., 2006). A male can fertilize up to 4 clutches in one breeding season. The species breeds in permanent streams (J.M. Guayasamin, pers. comm. 2008).
The species is only known from the type series, comprised of six specimens, which were collected during 3 years of inventory work at Yanayacu, suggesting that Nymphargus wileyi is a rare species (Guayasamin et al., 2006).
Habitat loss is a conspicuous threat for the species. It is thought to have a restricted range, although further field work is needed to test this (J.M. Guayasamin, pers. comm. 2008).
The species is found at Yanayacu Biological Station.
In the genus Nymphargus following Cisneros-Heredia and McDiarmid (2007). Guayasamin et al. (2006) indicate that the species can be distinguished from other similar species by a combination of morphological and colouration differences and allopatric distributions. Guayasamin et al. (2006) adopt the Evolutionary Species Concept in their description of Nymphargus wileyi.
Juan Manuel Guayasamin 2008. Nymphargus wileyi. In: IUCN 2014