IUCN threat status:

Near Threatened (NT)

Comprehensive Description

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Description

Males and females measure up to 84 mm and 100 mm SVL, respectively. The body is moderately slender. This species has a flat head, with an elongated, depressed snout that is longer than the diameter of the eye and projects beyond the lower jaw, and parallel canthi. Behind the eyes, laterally, the top of the head is slightly swollen. This frog has a small, round, and slightly depressed tympanum that is relatively small compared to the eye diameter. The nostrils are lateral and located between the snout and the eyes. There is a distinct and curved temporal fold that reaches to the insertion of the forelimb. It has a pear-shaped tongue that is deeply notched and without papillae. Vomerine teeth are strong and arrayed in two oblique series. Males have gular pouches at the corner of the throat. The skin is smooth on the back, throat and belly except in the rear which is granular. The ventral thigh skin is also granular next to the vent (Yang 1987).

The frog's forelimbs are robust, with slender fingers that vary in length. The third finger is the longest, followed by the fourth, second, then first. The tips of the fingers, particularly the two outer fingers, expand into discs with circummarginal grooves. The three outermost fingers have fringes on the edge, and elongated supernumerary tubercles at the finger base. Subarticular tubercles are enlarged, while the outer palmar tubercle is indistinct. Males have a large gray nuptial pad on the first finger. This frog has moderately slender legs that lead to toes which are fully webbed. The toes also have discs with circummarginal grooves, with the toe discs being smaller than finger discs. Subarticular tubercles as well as the inner metatarsal tubercle are long and narrow. It possesses no outer metatarsal tubercle (Yang 1987).

The basic body color is dark brown. There are small greenish yellow spots and occasional brown spots on the back. Dorsal surfaces of the thigh and tibia have black cross bars, while ventral surfaces are brownish. Females have small white granules on the sides of the head but are otherwise identical to males in coloration (Yang 1987).

The presence of gular pouches distinguishes this species from all the other mainland species of Amolops except A. afghanus , A. chunganensis , and A. nasica . However, males of all three species are much smaller in size, (38-55 mm) in comparison to A. chapaensis (79-84 mm). Only two species (A. formosus and A. hainanensis) approach the size of A. chapaensis and neither have gular pouches (Yang 1987).

This species was described by Yang (1987), as Amolops macrorhynchus. Dubois (1987) recognized it as Amolops chapaensis. Several subsequent phylogenetic analyses have shown, however, that this species is actually nested within the genus Odorrana rather than within the genus Amolops (Ngo et al. 2006; Cai et al. 2007; Che et al., 2007; Stuart 2008).

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