Dorsal coloration is uniform beige-bronze or green with occasional dark
spots (Savage and Heyer 1968). A bright dorsolateral cream stripe
extends from snout to groin, and is bordered below by a dark brown band, which
is bordered by a light brown line in turn bordered by thin white lines. The
venter is yellow flecked with black or brown spots, which distinguishes this species from neighboring species that have light dorsolateral stripes
(Savage and Heyer 1968). Limbs have dark brown spots on the dorsal aspect,
and the posterior thigh and plantar surface of the foot are suffused with yellow or green
melanophores. The dorsum and the underside of the legs are smooth, while the
venter is granular, and the heel is slightly warty. The snout is
sub-elliptical to pointed in dorsal outline, and rounded in profile. The iris
is orange-bronze with a central dark brown band and is at least twice the size
of the tympanum, and the upper lip and lore is golden-bronze
(Savage and Heyer 1968). There is no hand webbing and the toes are about
one half webbed (vestigal between toes I and II), but both hands and feet bear
large discs (Duellman 1970). Male vocal sacs are internal, paired, and
lateral (Savage and Heyer 1968).
The mating call has been described
as a pair of short, pulsed and poorly modulated notes (Duellman 1970).
Distribution and Habitat
Country distribution from AmphibiaWeb's database: Costa Rica, Panama
The habitat is humid forest, classified in the lower montane zone by Holdridge
(1967). H. angustilineata is found in the Cordilleras Central,
Tilaran, and Talamanca in Costa Rica, and in Panama's Parque Internacional
La Amistad, Cerro Horqueta (Arosemana and Ibanez 1991).
Life History, Abundance, Activity, and Special Behaviors
Not much is known about the natural history of H. angustilineata,
except that the breeding season includes March and April (though it may occur
more than once a year), and that oviposition and male calling takes place in
water filled depressions (Duellman 1970).
Trends and Threats
No population data has been reported for this species.
A Spanish-language species account can be found at the website of Instituto Nacional de Biodiversidad (INBio).
Arosemana, F.A., and Ibanez, D.R. (1991). ''Hyla angustilineata (NCN).'' Herpetological Review, 22(4), 133.
Duellman, W.E. (1970). The Hylid Frogs of Middle America. Monograph of the Museum of Natural History, University of Kansas.
Holdridge, L. R. (1967). Life Zone Ecology. Tropical Science Center, San Jose, Costa Rica.
Savage, J. M., and Heyer, W. R. (1968). ''The tree-frogs (Family Hylidae) of Costa Rica: diagnosis and distribution.'' Revista de Biologia Tropical, 16(1), 1-127.
Originally submitted by: Sean Schoville (first posted 1999-11-10)
Edited by: Meredith J. Mahoney (2009-11-02)
Species Account Citation: AmphibiaWeb 2009 Isthmohyla angustilineata <https://amphibiaweb.org/species/715> University of California, Berkeley, CA, USA. Accessed Jun 4, 2023.
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Citation: AmphibiaWeb. 2023. <https://amphibiaweb.org> University of California, Berkeley, CA, USA. Accessed 4 Jun 2023.
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