This species was originally known only from the type locality, 1.5 km NW of Cacazú, 1,200 m asl, Department of Pasco, Peru (Duellman and Hedges 2007), but was more recently recorded at 2,140 m asl at Abra Esperanza, in the buffer zone of Yanachaga Chemillén National Park in Pasco (Chávez et al. 2012). This species is very likely to occur more widely, particularly in Yanachaga Chemillén National Park, along the Llamaquizú River, and Bosque de Sho´llet, between 1,000–2,500 m asl (G. Chávez pers. comm. February 2018), which is reflected in the species' distribution map. The extent of occurrence (EOO) of its known range is 1,110 km2.
Habitat and Ecology
The species is found in riparian and montane cloud forests. The holotype was found perching on a leaf at ca 1.5 m above the ground in riparian forest at night. It uses vegetation very close to water bodies (Chávez et al. 2012). It is expected to reproduce by direct development, as with other congeners. It is unlikely the species can be found in open areas (G. Chávez pers. comm. February 2018).
The species was formerly only known from a few specimens, but surveys during 2011-2012 recorded ca 50 additional specimens in Bosque de Sho´llet and at Abra Esperanza just outside of Yanachaga Chemillén National Park (Chávez et al. 2012, G. Chávez pers. comm. February 2018). The species is relatively abundant where it occurs, and a healthy population of this frog probably exists both inside and outside Yanachaga Chemillén National Park (G. Chávez pers. comm. February 2018). Taxonomic confusion has caused this species to be misidentified in the past which may explain why it is usually absent from checklists of species of the area (G. Chávez pers. comm. February 2018).
No anthropogenic disturbances are currently threatening the species within protected areas (G. Chávez pers. comm. February 2018). The main threat outside Yanachaga Chemillén National Park is habitat loss caused by deforestation for livestock and agriculture, mainly granadilla (G. Chávez pers. comm. February 2018). While these activities are contributing to general habitat loss within a portion of its range, they are not thought to be causing population declines.
This species occurs in Área de Conservación Bosque de Sho´llet and Yanachaga-Chemillén National Park.
More information is needed on this species' distribution, population status, ecology, and threats.
Red List Status
Data Deficient (DD)
Listed as Least Concern because, although its distribution is limited – its estimated extent of occurrence (EOO) is 1,110 km2 – it occurs in a well protected national park, a healthy population of this frog is thought to exist, and threats outside of the park are currently localised and not thought to be causing declines at present.
Recently placed in the family Strabomantidae by Hedges et al. (2008).
IUCN SSC Amphibian Specialist Group 2018. Pristimantis adiastolus. The IUCN Red List of Threatened Species 2018: e.T136105A89220621. http://dx.doi.org/10.2305/IUCN.UK.2018-2.RLTS.T136105A89220621.en .Downloaded on 23 January 2019