Isthmohyla debilis


Taxonomy [top]

Kingdom Phylum Class Order Family

Scientific Name: Isthmohyla debilis
Species Authority: (Taylor, 1952)
Taxonomic Notes: This species was previously included in the genus Hyla but has recently been moved to the new genus Isthmohyla (Faivovich et al. 2005).

Assessment Information [top]

Red List Category & Criteria: Critically Endangered A2ace ver 3.1
Year Published: 2004
Date Assessed: 2008-01-01
Assessor/s: Frank Solís, Roberto Ibáñez, Gerardo Chaves, Jay Savage, César Jaramillo, Querube Fuenmayor, Federico Bolaños
Reviewer/s: Global Amphibian Assessment Coordinating Team (Simon Stuart, Janice Chanson, Neil Cox and Bruce Young)
Listed as Critically Endangered because of a drastic population decline, estimated to be more than 80% over the last three generations, inferred from the apparent disappearance of most of the population, probably due to the disease chytridiomycosis.

Geographic Range [top]

Range Description: This species is known from the Atlantic slopes of the Cordillera Central and the Cordillera de Talamanca in Costa Rica and western Panama (at 910-1,450m asl) and the Pacific slope of south-western Panama (at 1,200-1,400m asl) (Savage 2002).
Possibly extinct:
Costa Rica; Panama
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: It is now a rare species (Savage 2002). The Costa Rican population has declined dramatically, and it might now be extinct in this country. A dramatic decline was documented in the Reserva Forestal Fortuna, Chiriquí, in Panama, and the most recent record from this country is from the Bosque Protector Palo Seco, on the highlands of Bocas del Toro, in 1998.
Population Trend: Decreasing

Habitat and Ecology [top]

Habitat and Ecology: An arboreal species of the lower reaches of cloud forest. It is associated with low dense vegetation overhanging small montane streams (less than 1m above the water). Tadpoles develop in these streams, adhering to rocks (Savage 2002).
Systems: Terrestrial; Freshwater

Threats [top]

Major Threat(s): The decline in Costa Rica and in the Reserva Forestal Fortuna, Panama, is probably due to chytridiomycosis, and this is likely to be the most serious threat to the species. It is probably also impacted by habitat loss as a result of agriculture, logging, and human settlement.

Conservation Actions [top]

Conservation Actions: This species has been recorded from three protected areas in Panama, and two in Costa Rica. Further survey work is required to determine the population status of this species. In view of the threat of chytridiomycosis, ex-situ populations might need to be established.
Citation: Frank Solís, Roberto Ibáñez, Gerardo Chaves, Jay Savage, César Jaramillo, Querube Fuenmayor, Federico Bolaños 2004. Isthmohyla debilis. In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.2. <>. Downloaded on 18 April 2014.
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