Narrow-lined Treefrog
CR

Narrow-lined Treefrog

Isthmohyla angustilineata

Declining

Photo: Wikimedia Commons (CC) via https://en.wikipedia.org/wiki/Narrow-lined_tree_frog

Overview

The narrow-lined tree frog is a species of frogs in the family Hylidae found in the mountains of Costa Rica and western Panama. Its natural habitats are humid lower montane rainforests. It is a nocturnal species that breeds in small puddles and water-filled depressions.

Isthmohyla angustilineata faces severe threats from habitat destruction due to deforestation, agricultural expansion, and urban development throughout its limited range in Central America. The species is particularly vulnerable due to its restricted distribution and dependence on pristine cloud forest environments that are increasingly fragmented and degraded.

Threat summary

Habitat

This species inhabits montane cloud forests and humid premontane forests at elevations between 1,200-2,400 meters. It is typically found in primary and secondary forest canopy, particularly associated with bromeliads and other epiphytic vegetation in these misty, high-altitude tropical environments.

Forest· majorForest - Subtropical/tropical moist lowland· majorForest - Subtropical/tropical swamp· major

Conservation measures underway

Site/area protectionSpecies recoveryEx-situ conservation

Other threatened species in HYLIDAE

VU

Maracas Heart-tongued Frog

Phyllodytes tuberculosus

Declining
VU

Papallacta Treefrog

Hyloscirtus psarolaimus

Declining
VU

Scinax rupestris

Unknown
CR

Nyctimantis pomba

Declining

Threatened in Costa Rica

EN

Passiflora chimuensis

Unknown
EN

Palicourea brenesii

Unknown
EN

Baird's Tapir

Tapirus bairdii

Declining
CR

Mespilodaphne paradoxa

Unknown

Frequently asked questions

Why is Narrow-lined Treefrog classified as Critically Endangered?
Narrow-lined Treefrog is classified as Critically Endangered — facing an extremely high risk of extinction in the wild — because population sizes are very small, declining sharply, or restricted to a tiny range. Isthmohyla angustilineata faces severe threats from habitat destruction due to deforestation, agricultural expansion, and urban development throughout its limited range in Central America. The species is particularly vulnerable due to its restricted distribution and dependence on pristine cloud forest environments that are increasingly fragmented and degraded.
Where does Narrow-lined Treefrog live?
Narrow-lined Treefrog occurs in Costa Rica, and Panama. Country-level distribution data is sourced from the IUCN Red List and cross-referenced with GBIF occurrences.
What are the main threats to Narrow-lined Treefrog?
The main threats to Narrow-lined Treefrog are 11.1, 2.1, 5.3, and 8.1. The full IUCN-classified threat record for this species is detailed on the species page.

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