IUCN threat status:

Vulnerable (VU)

Comprehensive Description

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Distinguished from all other Costa Rican hylids, with the exception of Hyla fimbrimembra, by the presence of dermal fringes along the posteroventral margins of the limbs (Savage and Heyer 1968). It differs from H. fimbrimembra in lacking true integumentary-cranial co-ossification, although the presence of osteoderms belays a false impression of this character (Duellman 1970). Other distinguishing features include fully webbed hands and feet, and tuberculate skin that is present in both juveniles and adults. Adults have keratinized granules on their venter, and breeding males have protruding prepollical spines.

The head is flat on top and rounded in dorsal outline, and the snout appears truncate in both dorsal and lateral outline. The tympanum is about half the size of the eye, and above it a bony ridge followed by a dermal fold extends posteriorly to just above the arm's insertion. The canthus is rounded and the internarial area is depressed. Arms are short and robust, and the immense hand bears large discs. The legs are long and moderately robust, and the feet also bear large discs. Recorded snout-vent length measurements ranged from 57.2 to 106.0 mm for male adults, and 69.7 mm for the single collected female (all above descriptions from Duellman 1970).

The dorsal coloration is mottled with dark brown, metallic green, and orange-tan, while ventral surfaces range from pink-tan to light-brown, except for the anal region which is creamy white. The chin has white tubercles and dark brown spots, the tympanum, webbing, and discs are dark brown, and the iris is bronze with reddish-brown reticulations (all color descriptions from Duellman 1970).

No call has been attributed to thisspecies, although a "loud growl-like" sound has been noted (Duellman 1970).

Older nomenclature refers to Hyla miliaria as H. immensa. For a summary of name history, refer to Duellman (1970).

A Spanish-language species account can be found at the website of Instituto Nacional de Biodiversidad (INBio).


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