Taxonomy & naming
Hongshuia wangi 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 boulobos, 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 wangi is distinguished from both H. brevibarba and H. boulobos by a wider median lobe on the lower lip, its width running 47.8-57.6% of head width, compared with 40.5-43.4% in H. brevibarba and 38.5-44.0% in H. boulobos. The Catalog of Fishes gives the type locality as the Zhangbu River, flowing into the Caodu River within the Pearl River basin, near Zhangbu Village, Pingtang County, Guizhou Province.
Morphology
No absolute length measurements for Hongshuia wangi 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. wangi has a lower lip with a sector-shaped median lobe (its widest point toward the front rather than in the middle), and that median lobe is proportionally wider than in either H. brevibarba or H. boulobos, at 47.8-57.6% of head width.
As a labeonine cyprinid, H. wangi 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 wangi is known from the Zhangbu River, where it flows into the Caodu River within the Pearl River basin, near Zhangbu Village, Pingtang County, Guizhou Province, China, at approximately 26°03'39"N, 107°03'55"E. The Catalog of Fishes gives its distribution as the Caodu River drainage within the Pearl River basin, Guizhou Province — a separate tributary system from the karst spring habitat documented for its congener H. boulobos, described in the same paper. Specific water chemistry, temperature and current speed at the type locality were not accessible for this article.
Feeding
No dietary study specific to Hongshuia wangi 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. wangi specifically.
Mating
No courtship behaviour has been documented for Hongshuia wangi, and no sexual dimorphism is reported in the sources accessible for this article.
Breeding
Hongshuia wangi 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 wangi is not established in the aquarium hobby and has no husbandry record; it was described only in 2026 from a single tributary stream 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 wangi has not been evaluated by the IUCN Red List, having been described only in 2026. Its documented range is limited to the Caodu River drainage of the Pearl River basin in Guizhou Province, China, and no population, trend or threat data specific to the species were accessible for this article.