Taxonomy & naming
Glyptothorax intonsus was described in 2026 by Heok Hee Ng and Maurice Kottelat in the Journal of Fish Biology, from a small forest stream in the Nam Mang watershed of the middle Mekong River drainage, Vientiane Province, Laos. It belongs to the family Sisoridae — the Asian torrent catfishes — within the subfamily Sisorinae and the large genus Glyptothorax. The Catalog of Fishes (Eschmeyer, California Academy of Sciences) treats Glyptothorax intonsus as the valid, currently accepted name.
The type series — a holotype and four paratypes — was collected from a small forest stream along the road from Ban Pak Leuk to Ban Longxam, a headwater of the Nam Leuk catchment within the Nam Mang watershed, at roughly 1,444 ft elevation (18°27'05"N, 103°04'06"E). The source material available for this article is limited to the published abstract and the Catalog of Fishes record; the full paper text was not accessible.
Morphology
According to the published abstract, Glyptothorax intonsus is distinguished from all other Glyptothorax in the Mekong drainage by a combination of characters: very long nasal barbels, distinctive head and body proportions, features of the thoracic adhesive apparatus and lateral line, colouration, and body tuberculation (small tubercle-like projections on the skin). Beyond this list, the exact measurements, colour pattern and tuberculation details are reported only in the full paper text, which was not accessible for this article.
No maximum size in centimetres is stated in the abstract. Like other Glyptothorax, the species can be expected to have the genus's flattened, torrent-adapted body and scaleless skin — a genus-level generality, not a specific observation.
Habitat
Glyptothorax intonsus is known only from its type locality: a small forest stream in the Nam Leuk catchment of the Nam Mang watershed, part of the middle Mekong River drainage in Vientiane Province, Laos, at an elevation of roughly 1,444 ft. Like other Sisoridae, it presumably inhabits fast-flowing, rocky, well-oxygenated water typical of the family's hillstream habitat — a genus-level expectation consistent with the forest-stream, moderate-elevation type locality, though no water-chemistry data were reported in the accessible abstract.
Feeding
No feeding observations are available for Glyptothorax intonsus. Like other Sisoridae, it is presumed to be a benthic omnivore grazing rock surfaces for biofilm and small invertebrates — a family-level generality, not a documented observation for this species.
Mating
No mating behaviour has been recorded for Glyptothorax intonsus, and no external sexual dimorphism has been described. This is a 2026 description known only from its type series.
Breeding
Glyptothorax intonsus has never been kept or bred in captivity. As with most Sisoridae, captive breeding of the genus is essentially undocumented.
In the aquarium
Glyptothorax intonsus is not present in the aquarium trade — it is known only from a small scientific type series collected in Laos. Were it ever to appear in the trade, the standard approach for small hillstream Glyptothorax would apply: strong current, high dissolved oxygen, cool to moderate water, and smooth cobble the fish can grip with its thoracic adhesive apparatus. As with all Sisoridae, the skin is scaleless, so medications should be dosed conservatively, and the fish should be moved in a container rather than netted. These are genus-level cautions, not species-specific data.
Conservation
Glyptothorax intonsus has not been assessed by the IUCN Red List and carries a status of Not Evaluated, as expected for a species described in 2026. It is currently known only from a single forest-stream locality in the Nam Mang watershed of Vientiane Province, Laos. Laos's Mekong tributaries face ongoing pressure from hydropower dam construction and associated habitat fragmentation, though no species-specific threat assessment has been carried out for G. intonsus.