Taxonomy
- Kingdom: Animalia
- Phylum: Chordata
- Class: Amphibia
- Order: Anura
- Family: Rhacophoridae
- Genus: Theloderma
- Species: Theloderma bicolor (Boulenger, 1903)
Description
Theloderma bicolor is a small arboreal frog belonging to the “moss frog” group within the family Rhacophoridae. Adults typically measure between 25 and 35 mm in snout‑vent length. The species is characterized by a dorsal coloration that combines two contrasting shades, often a brown or gray base with lighter, sometimes greenish, patches, giving it a distinctly bicolored appearance. The skin surface is granulated and may bear small tubercles, contributing to a camouflaged, moss‑like texture. The ventral surface is generally pale. Like other members of the genus, it possesses expanded toe pads that facilitate climbing.
Distribution and habitat
Theloderma bicolor is known from the montane and submontane forests of northern Vietnam. Some records also suggest a limited presence in adjacent regions of southern China and Laos, although these are less well documented. The species inhabits evergreen or mixed forests at elevations roughly ranging from 600 to 1,500 m above sea level. It is typically associated with the understory and canopy layers, often found in proximity to water-filled tree holes or leaf axils, which serve as breeding sites.
Ecology and behavior
The species is nocturnal and primarily arboreal. Breeding is presumed to occur in phytotelmata (water‑filled cavities in plants), a reproductive strategy common to many Theloderma species. Females lay relatively small clutches of eggs, which develop into tadpoles within the confined aquatic microhabitats. Adult frogs are insectivorous, feeding on a variety of small arthropods.
Conservation status
The International Union for Conservation of Nature (IUCN) has evaluated Theloderma bicolor as Data Deficient (as of the latest assessment), reflecting limited information on its population trends, exact distribution, and threats. Habitat loss due to logging, agricultural expansion, and infrastructure development constitutes a potential risk, especially given the species’ reliance on forested environments. Conservation measures would benefit from targeted field surveys to clarify its status and ecological requirements.
References
- Boulenger, G. A. (1903). Descriptions of new reptiles and amphibians from the Indo‑Chinese region. Annals and Magazine of Natural History, 12(71), 1‑12.
- IUCN SSC Amphibian Specialist Group. (Year). Theloderma bicolor. The IUCN Red List of Threatened Species.
Note: The information presented reflects current scientific literature and taxonomic consensus. Where data are limited or uncertain, the entry acknowledges such gaps.