Ahaetulla isabellina
Wall's vine snake ("Ahaetulla isabellina") is a species of tree snake endemic to the southern Western Ghats of India. Taxonomy. It was formerly considered a subspecies of "A. nasuta", which is now considered to only be endemic to Sri Lanka. A 2020 study found "A. nasuta" to be a species complex of "A. nasuta sensu stricto" as well as "A. borealis", "A. farnsworthi", "A. isabellina", and "A. malabarica", elevating "A. isabellina" to species. The specific epithet is a reference to the isabelline yellow coloration of the species' dorsal body in live condition, which distinguishes it from other  species in the complex. Geographic range. This species is distributed in the southern Western Ghats in Tamil Nadu and Kerala south of the Palghat Gap, from the Anaimalai Hills south to at least Sivagiri, Kerala, although more work is needed to determine the southern limit of the species' range. Habitat. This species is found in evergreen forests of the Western Ghats from ~550 m to 1475 msl.