Comprehensive DescriptionRead full entry
SVL of females 52.4-62.1 mm; SVL of males 41.1-46.7 mm (Coloma et al. 2000). Diagnosis: Stout body with relatively short limbs. Fingers unwebbed, toes webbed; digits have rounded tips. Toe I is distinct. Head is as broad as it is long. Interorbital space equal to the width of the upper eyelid. Snout subacuminate, protruding. No tympanum visible. Tongue is elliptical, and free behind. Palate smooth. Spiny warts on sides of body. Extent of warts varies: may be small patch between eye and arm, or may extend down the sides to the femur. A juvenile specimen was reported to be covered with spiny warts dorsally and with flat tubercles ventrally (Ruthven 1916).
Most individuals are uniformly black in coloration or black with a slightly lighter venter (Ruthven 1916), but there is at least one population of red morphs (discovered in 2008 at La Serrania de Cebolleta; Rueda 2008).
Tadpoles are unusually long for Atelopus, about twice the length of other known Atelopus larvae (Ruíz-Carranza et al. 1994).
This species belongs to the ignescens group of Atelopus (Lötters 1996).