This species is known only from the type locality, Chaco, Bolivia, and from the nearby surroundings. The type locality might actually be "Chaco in the Unduavi valley, Yungas de La Paz, 16° 21'S; 67° 49'W, at approximately 1,850m." Its altitudinal range is around 1,850-2,700m asl.
Habitat and Ecology
This species is a diurnal inhabitant of montane cloud forest. There is no information on breeding, but it probably breeds by direct development like other species of the genus.
It is an abundant species at the type locality. However, although it is currently common, it is feared that the species will undergo a steep population decline in the near future, especially as the quality of its habitat declines.
Agriculture and logging are the major threats to its habitat.
It occurs in Parque Nacional Cotapata, and the ecological needs of this species should be incorporated as part of the management plan of this protected area.
Red List Status
Listed as Endangered because its Extent of Occurrence is less than 5,000 km2, all individuals are in fewer than five locations, and there is continuing decline in the extent and quality of its habitat in Bolivia.
This species was formerly considered a synonym of Pristimantis fenestratus by Lynch (1980), but it was elevated to species status by Kohler (2000a).
Claudia Cortez, Steffen Reichle, Ignacio De la Riva, Jörn Köhler 2004. Yunganastes bisignatus. The IUCN Red List of Threatened Species 2004: e.T56465A11469673. http://dx.doi.org/10.2305/IUCN.UK.2004.RLTS.T56465A11469673.en .Downloaded on 13 December 2018