This species occurs in the Cordillera de Tilarán, Cordillera Central, and Cordillera de Talamanca of Costa Rica and western Panama, from 1,500-2,040m asl (Savage 2002).
Habitat and Ecology
It is a nocturnal tree frog of humid lower montane rainforest. Breeding usually takes place in small puddles and water-filled depressions. Males call from leaves and twigs above the forest flood. Tadpoles are benthic (Savage 2002).
This is generally an uncommon species. The population is decreasing, but threats to the species remain unknown. In Costa Rica, the species has disappeared from Cerro Chompipe and Tapanti. It declined drastically in Monteverde, but a few individuals persisted until at least the late 1990s, and the particular site where they were found has not been visited since; there is a chance that it still survives at Monteverde. In Panama there is a scarcity of information on its distribution and abundance, though it appears to have declined, and the most recent record is from Parque Internacional La Amistad, in Chiriquí Province, in 1991.
The reasons for the population decline of this species are not known with certainty, though it is likely to be due to chytridiomycosis, perhaps in association with climate change.
The current known range of this species falls entirely within protected areas (Parque Internacional La Amistad, Panama, and at least three protected areas in Costa Rica). Further survey work is required to determine the population status and trends of this species. In view of the threat of chytridiomycosis, ex-situ populations might need to be established.
This species was previously included in the genus Hyla but has recently been moved to the new genus Isthmohyla (Faivovich et al. 2005).
Solís, F., Ibáñez, R., Pounds, J., Bolaños, F. & Chaves, G. 2008. Isthmohyla angustilineata. In: IUCN 2014