Taxonomy & naming
Hongshuia boulobos was described in 2026 by Zhi-Xuan Zeng and E Zhang, in a paper co-authored with Cheng-Jiang Tan and Ben-Lin Zhang and published in Zoological Studies; the Catalog of Fishes records the species authority as Zeng & Zhang in Zeng, Tan, Zhang & Zhang, 2026, reflecting that the formal naming act is credited to two of the paper's four authors. It belongs to the genus Hongshuia, part of the subfamily Labeoninae within the family Cyprinidae, and was described together with a second new species, Hongshuia wangi, from separate tributaries of the Pearl River basin in southwest China. The same paper re-examines H. paoli and, based on morphological and molecular evidence, treats it as a junior synonym of H. megalophthalmus.
Both new species share with H. brevibarba a lower lip carrying a sector-shaped median lobe, with its greatest width positioned toward the front of the lobe — a character separating them from H. microstomata and H. megalophthalmus, which instead have a roughly rounded median lobe. Hongshuia boulobos is further distinguished from all its congeners, including H. wangi and H. brevibarba, by having larger lateral lobes on the lower lip, with a width more than one-third that of the median lobe (versus less than one-third in the other species). The Catalog of Fishes gives the type locality as the major outlet of the Dongsai subterranean river, where it emerges to join the Longjiang River, a main tributary of the Liujiang River within the Pearl River basin, near Yaosuo Village, Libo County, Guizhou Province.
Morphology
No absolute length measurements for Hongshuia boulobos were accessible for this article; the primary description's full morphometric tables were not reached from the sources used here. The key diagnostic character reported is the shape and proportions of the lower lip: like its relative H. brevibarba, H. boulobos has a lower lip with a sector-shaped median lobe (its widest point toward the front rather than in the middle), but its lateral lobes are proportionally larger than in any other congener, with a width exceeding one-third that of the median lobe. Its median lobe itself is comparatively narrow, 38.5-44.0% of head width, narrower than the 47.8-57.6% reported for H. wangi.
As a labeonine cyprinid, H. boulobos would be expected to carry the ventral, disc-adapted mouth typical of the tribe, used for gripping and grazing rock surfaces in flowing water, but detailed description of the oral disc, snout, colouration and fin-ray counts beyond the lip characters above were not accessible for this article.
Habitat
Hongshuia boulobos is known from the major outlet of the Dongsai subterranean river, where it flows into the Longjiang River, a main tributary of the Liujiang River within the Pearl River basin, near Yaosuo Village, Libo County, Guizhou Province, China, at approximately 25°17'25"N, 108°04'00"E. The Catalog of Fishes gives its broader distribution as the Longjiang River drainage, upper Liujiang River system, Pearl River basin, spanning Guizhou and Guangxi Provinces. Libo County lies within a well-known karst landscape in southern Guizhou, and the species' association with a subterranean river outlet is consistent with the cave-riddled limestone terrain typical of that region, though specific water chemistry, temperature and current speed at the site were not accessible for this article.
Feeding
No dietary study specific to Hongshuia boulobos has been published. As a labeonine cyprinid — a lineage that also includes the disc-mouthed, algae-grazing genera Garra and Discogobio — it would be expected to feed at least in part by grazing algae and biofilm from rock surfaces using its specialized lips and oral disc, but this is a broad tribe-level inference, not a finding reported for H. boulobos specifically.
Mating
No courtship behaviour has been documented for Hongshuia boulobos, and no sexual dimorphism is reported in the sources accessible for this article.
Breeding
Hongshuia boulobos has not been spawned or observed breeding in the wild, as far as published sources show. Cyprinids in general, including labeonine genera such as Hongshuia, are typically egg-scattering broadcast spawners with no parental care — a family-level generalization, not a confirmed account of this species' reproductive biology.
In the aquarium
Hongshuia boulobos is not established in the aquarium hobby and has no husbandry record; it was described only in 2026 from a single karst spring system in Guizhou Province. The genus Hongshuia as a whole is essentially absent from the aquarium trade, in contrast to some of its labeonine relatives — several Garra species, for example, are traded as algae-eaters — and there is no indication this species is collected or traded.
Conservation
Hongshuia boulobos has not been evaluated by the IUCN Red List, having been described only in 2026. Its documented range is limited to the Longjiang River drainage of the upper Liujiang River system, Pearl River basin, in Guizhou and Guangxi Provinces, China, and no population, trend or threat data specific to the species were accessible for this article.