This species is currently known only from the type locality: Huamba, 22 km ESE (airline) of Ayabaca, in the northern portion of the Cordillera de Huancabamba, Piura region, in northwestern Peru (Venegas et al. 2008). It occurs at an elevation of 2,950 m asl.
Habitat and Ecology
Atelopus eusebiodiazi inhabits the cloud forest around Cerro Mayordomo. Individuals have been observed in leaf litter and along small streams (Venegas et al. 2008). It is presumed to breed in fast flowing montane streams.
This species was observed in September 1987 and again in October 1997. However, recent surveys to the type locality and adjacent areas in May and September 2006 were unable to locate this species (Venegas et al. 2008). There is a possibility that this species may be extinct (P. Venegas pers. comm. October 2010).
The cloud forest surrounding Ayabaca and the type locality of A. eusebiodiazi is threatened by habitat destruction due to an increase in cattle grazing and agricultural land use. The forest on the western slope of Cerro Mayordomo is fragmented with patches of less than 100 ha. The largest patch of montane forest near Cerro Mayordomo is found in the neighbouring locality of Anchalá. This isolated forest is known as Bosque de Cuyas and is completely surrounded by croplands (Venegas et al. 2008).
No conservation measures are currently in place for this species and its immediate environs. Conservation of remaining forest fragments is a high priority, as well as further survey work to determine whether the species is still extant.
Red List Status
Critically Endangered (CR)
Listed as Critically Endangered because of a drastic population decline, estimated to be more than 80% over the last ten years, inferred from the apparent disappearance of most of the population, and because its extent of occurrence is less than 100 km², it is known from only one location and the habitat in the surrounding area is severely fragmented, and there is continuing decline in the extent and quality of its cloud forest habitat in northern Peru.
IUCN SSC Amphibian Specialist Group 2011. Atelopus eusebiodiazi. The IUCN Red List of Threatened Species 2011: e.T158466A5199200. http://dx.doi.org/10.2305/IUCN.UK.2011-2.RLTS.T158466A5199200.en