Description
A small frog with a broad head and a short pointed snout with sharp edges. Males range in size 31-33 mm; females 45-51 mm. All toes are webbed to the base of the discs (except for the fourth toe). The two outer fingers are fully webbed to the discs. Smooth skin on head and back; granular skin on chest and stomach. Colour varies from light grey-green to sandy brown. Some species have dark crossbars on the back and white spots on the side of the head or body. Sides of the body and inner surfaces of the legs are typically bright yellow with several big black spots. Chest and stomach are pearly white (Inger and Stuebing 2005).

Distribution and Habitat

Country distribution from AmphibiaWeb's database: Indonesia, Malaysia

Malaysian region distribution from AmphibiaWeb's database: Sabah

	View distribution map in BerkeleyMapper.
	View Bd and Bsal data (2 records).

This species is known from northern Borneo (Malaysia) and from one locality in Sumatra, Indonesia. It has been observed at an altitudinal range of 700-1800 m asl (Inger et al. 2004). It occurs in primary forest and can be found along clear, rocky streams. Tadpoles live in gravel riffles (Inger and Stuebing 2005).

Life History, Abundance, Activity, and Special Behaviors
The call sounds like a sharp chirp (Inger and Stuebing 2005).

Larva
In tadpoles, the body is oval and slightly flattened above. Slender tail is twice the size of the body. Wide lips form a cup-like structure. Body is dark and almost black on top and sides. Tail muscle mottled with dark spots; upper fin with smaller dark spots. Total length reaches 36 mm (Inger and Stuebing 2005).

Trends and Threats
Habitat loss as a result of clear-cutting is the major threat to this species, and logging has already severely damaged the habitat at one known locality, Mount Trus Madi, in Borneo. Besides Gunung Kinabalu National Park, it is also present in the Crocker Range, in Malaysian Borneo; however, the Sumatran locality lies outside any protected areas (Inger et al. 2004).

Possible reasons for amphibian decline

General habitat alteration and loss
Habitat modification from deforestation, or logging related activities

References

Inger, R. F. and Stuebing, R. B. (2005). A Field Guide to the Frogs of Borneo, 2nd edition. Natural History Publications (Borneo), Kota Kinabalu.

Inger, R., Stuebing, R., Iskandar, D., and Mumpuni (2004). Rhacophorus angulirostris. In: IUCN 2008. 2008 IUCN Red List of Threatened Species. www.iucnredlist.org. Downloaded on 06 May 2009.

Species Account Citation: AmphibiaWeb 2022 Leptomantis angulirostris: Masked Tree Frog <https://amphibiaweb.org/species/4493> University of California, Berkeley, CA, USA. Accessed Nov 24, 2024.

Citation: AmphibiaWeb. 2024. <https://amphibiaweb.org> University of California, Berkeley, CA, USA. Accessed 24 Nov 2024.

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