Comprehensive Description

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Size of male 68 mm SVL, female 80 mm SVL. This frog is a casque-headed hylid and is unmistakable with sharp pointed bony spines on the head and a huge tympanum. Skin is co-ossified to the skull. Juveniles lack the projections. Males do not have vocal slits (Jungfer 1996). Color is dark brown above with a black venter and flanks bordered with white. The larvae are white on hatching (Jungfer 1996), later becoming dark brown above and bluish-gray below as they mature (Savage 2002).

Karyotype is 2N=24 (Sessions 1978).

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


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