Smooth Slug Snake, Asthenodipsas laevis (BOIE, 1827) – of Sarawak/Borneo – around 1020m ASL.

Asthenodipsas laevis (Boie, 1827) is a small, slender pareid snake (Pareidae) endemic to Sundaland and adjacent mainland margins; within Asthenodipsas it belongs to the A. malaccana clade sensu lato. It was originally described as Amblycephalus laevis; subsequent combinations include Dipsas laevis, Pareas laevis, and Internatus laevis. The type locality was later fixed to “Java, Indonesia.” The species is oviparous. Its distribution spans southern Thailand and the Malay Peninsula (including Singapore) and extends across the Sunda Islands—Sumatra, Borneo, and nearby islands such as Bangka, Mentawai, and the Natuna group—with records also from Laos. It inhabits evergreen lowland to hill forest, is chiefly crepuscular–nocturnal, and uses the leaf-litter and low vegetation (“partly arboreal”). Ecologically, A. laevis is a specialized molluscivore (terrestrial snails and slugs); the asymmetric mandibular dentition typical for pareids is interpreted as a functional adaptation to extracting dextrally coiled snails. Phylogenetically, Asthenodipsas is supported as monophyletic with two deeply divergent lineages; A. laevis falls within the malaccana lineage.