Taxonomy & naming
Pseudomystus stenogrammus Ng & Siebert, 2005 is the valid name in the Catalog of Fishes, described from Sungai Laung at Maruwei in Kalimantan Tengah. The epithet appears to combine Greek stenos ('narrow') and gramme ('line'), which would fit a narrow stripe.
Morphology
Pseudomystus are small bagrid catfishes of South and Southeast Asia, with a short adipose fin, four pairs of barbels, a serrated spine at the front of the dorsal and pectoral fins, and a body marked with pale and dark bands or stripes in most species. FishBase gives this species a maximum of 5 in SL for females.
Habitat
FishBase gives its range as southern Borneo, Indonesia, and lists it as a freshwater, bottom-living tropical species. The type locality is Sungai Laung in Kalimantan Tengah.
Feeding
Bagrids of this genus are nocturnal carnivores and omnivores that take insects, crustaceans, worms and small fish. Species-level diet data are not recorded in the sources available to the atlas. In captivity they accept frozen foods, live worms and meaty sinking pellets.
Mating
Mating behaviour is not recorded in the sources available to the atlas.
Breeding
Captive breeding of this species is not recorded in the sources available to the atlas.
In the aquarium
Offer plenty of caves and dark retreats; the fish are shy by day and active after dark. Avoid keeping them with fish small enough to be swallowed. Handle with care because of the pectoral and dorsal spines. FishBase gives no temperature, pH or hardness range for this species.
Conservation
The IUCN Red List assessed it as Data Deficient in 2019, meaning there is too little information to rate its risk. Lowland forest streams in its range are being cleared and polluted.