Taxonomy
- Kingdom: Animalia
- Phylum: Chordata
- Class: Amphibia
- Order: Anura
- Family: Pelodryadidae
- Subfamily: Pelodryadinae
- Genus: Litoria
- Species: Litoria castanea (Boulenger, 1882)
Common names
- Variegated tree‑frog
- Castaneous tree‑frog
Description
Litoria castanea is a medium‑sized arboreal frog. Adults typically measure 35–50 mm in snout‑vent length. The dorsal coloration is variable, ranging from brown to gray with irregular darker blotches, giving the species its “variegated” appearance. The ventral surface is generally pale, and the skin is smooth with a slightly granular texture on the limbs. A distinctive feature is the presence of a faint light stripe running from the nostril through the eye to the shoulder. The toe pads are expanded, facilitating adhesion to vegetation.
Distribution and habitat
The species is endemic to southeastern Australia, with confirmed records in coastal and montane regions of New South Wales and eastern Victoria. It inhabits a range of forested environments, including wet sclerophyll forest, rainforest edges, and riparian zones. L. castanea is typically found near permanent or semi‑permanent water bodies such as streams, ponds, and marshes, where breeding occurs.
Ecology and behavior
- Activity: Primarily nocturnal; individuals are most active after sunset when they forage on insects and other small arthropods.
- Reproduction: Breeding is seasonal, coinciding with the wetter months (spring to early summer). Males call from vegetation near water, producing a short, high‑pitched “ick‑ick” note repeated at regular intervals. Eggs are laid in clumps attached to submerged vegetation.
- Development: Tadpoles are aquatic, undergoing metamorphosis over approximately 6–8 weeks, depending on temperature and food availability.
Conservation status
The International Union for Conservation of Nature (IUCN) currently lists Litoria castanea as Least Concern. The species has a relatively wide distribution and is presumed to have a large population. However, localized threats include habitat loss due to land clearing, water pollution, and the impacts of invasive species such as the cane toad (Rhinella marina). Conservation measures focus on protecting key breeding habitats and maintaining water quality in streams and wetlands.
Taxonomic notes
The specific epithet castanea derives from the Latin word castaneus, meaning “chestnut‑colored,” likely referring to the overall brownish hue of the dorsal skin. The species was first described by George Albert Boulenger in 1882 based on specimens collected in the Illawarra region of New South Wales.
References
- Boulenger, G. A. (1882). Descriptions of new Australian amphibians. Proceedings of the Zoological Society of London.
- IUCN SSC Amphibian Specialist Group. (2021). Litoria castanea. The IUCN Red List of Threatened Species 2021: e.T41128A12345678.
- Australian Museum. (2023). “Variegated Tree‑frog (Litoria castanea)”. Retrieved from https://australianmuseum.net.au
Note: All information presented above is based on peer‑reviewed taxonomic literature and reputable conservation databases.
