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Body and arms robust. Head is slightly wider than long with a length of 28% SVL (max SVL of 70.7 mm). Snout is slightly rounded in lateral and dorsal view. Loreal region is slightly rounded in cross section. In life, dorsal coloration of back, arms, and legs is light brown with golden tints. Bars are present on the legs and arms with black spots on the dorsum. Ventral coloration is an off-white. Eye diameter is 1.3 times internarial distance. Tympanum is absent. Postocular fold is visible and reaches the middle of the body. The head has small granules, especially the supraocular areas and under the postocular fold. Dentigerous processes (6-7) are present on the vomer between the choanae. Relative finger sizes are 1<2<4<3, relative toe lengths are 1>2>3>5>4. Dorsal surface and internal border of the first finger has strong thorny excrescences which are brown in color. The internal border of the second finger has a thin band of spines. The chest has the characteristic Alsodes bilateral patches of small spines. Ventral, dorsal and lateral surfaces of thighs have minute granules; a fold of skin is present between the posterior border of the arm and the middle of the body (Cuevas and Formas 2001).

Tadpoles were found at the type locality in varying stages of development, Gosner (1960) stages 25-40. The larvae in stage 25 have ovoid bodies when viewed laterally and are 2.6 times longer than wide. Snout is round. Nostrils are small and situated between the eye and snout tip. Pupils are circular with a goldeniris spotted by black reticulations. Labial tooth row formula is (1)(1-1)/(1-1)(2). Karyotypes show 26 biarmed chromosomes.

This species is known only from its type locality, Rio Lircay, Region del Maule, on the western slope of the Andes, Chile.

According to Cuevas and Forma (2001), it is in the Alsodes monticola group.


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