Adult males measure 31–33 mm (1.2–1.3 in) in snout–vent length. The overall appearance is slender. The snout is truncate from above but obliquely projecting when viewed from the side. The tympanum is distinct. The fingers are sender and bear small terminal discs. The toe tips are swollen. No webbing is present. The dorsum is covered with numerous rounded tubercles. Dorsal colouration is blackish. There are obscure brown markings. The flanks have yellowish to pale brown marbling. The limbs have narrow cross-bars.[2]
Ansonia torrentis is known from beside a small, clear, mountain stream with a steep gradient at about 1,800 m (5,900 ft) above sea level.[1] Males were mostly calling from low vegetation on rock faces bordering a stream section with steep water chutes and small rock pools.[1][2] The tadpoles presumably develop in this same stream habitat.[1]
The known distribution of this species is within the Gunung Mulu National Park. It is believed to be reasonably abundant there. Although the range is limited, the habitat is well-protected and not threatened at present.[1]
^Haas, A.; Das, I. & Hertwig, S.T. (2022). "Ansonia torrentis Torrent Slender Toad". Frogs of Borneo – The frogs of East Malaysia and their larval forms. Retrieved 21 November 2022.
^"Ansonia torrentis". AmphibiaWeb. University of California, Berkeley. 2022. Retrieved 22 November 2022.
