AMPHIBIAWEB
Rhacophorus angulirostris
Masked Tree Frog
family: Rhacophoridae
subfamily: Rhacophorinae

© 2009 Andreas & Christel Nöllert (1 of 8)

Frogs of Borneo account.

Conservation Status (definitions)
IUCN (Red List) Status Endangered (EN)
CITES No CITES Listing
Other International Status None
National Status None
Regional Status None

 

View distribution map using BerkeleyMapper.

   

Description
M 31-33 mm. F 45-51 mm. A small frog with a broad head and a short pointed snout with sharp edges. 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).

Tadpoles: 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).

Distribution and Habitat

Country distribution from AmphibiaWeb's database: Indonesia, Malaysia

Malaysian region distribution from AmphibiaWeb's database: Sabah

 

View distribution map using BerkeleyMapper.
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).

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.



Written by Catherine Aguilar (catherineaguilar AT berkeley.edu), UC Berkeley Museum of Vertebrate Zoology
First submitted 2009-05-06
Edited by Kellie Whittaker (2014-10-29)

Species Account Citation: AmphibiaWeb 2014 Rhacophorus angulirostris: Masked Tree Frog <http://amphibiaweb.org/species/4493> University of California, Berkeley, CA, USA. Accessed Oct 16, 2017.



Feedback or comments about this page.

 

Citation: AmphibiaWeb. 2017. <http://amphibiaweb.org> University of California, Berkeley, CA, USA. Accessed 16 Oct 2017.

AmphibiaWeb's policy on data use.