Taxonomy & naming
Rhinogobius mengyangensis was described in 2026 by Liu, Chen, Shu, Huang, Liu and Yu in the journal ZooKeys (volume 1280, pages 333–347), based on a holotype and fourteen paratypes collected from the Mengyang River at Mengyang Town, Pengzhou City, in the Chengdu City area of Sichuan Province, China. The Catalog of Fishes (Eschmeyer, CAS) — the authority for valid names — lists it as valid in the genus Rhinogobius, placed in the family Oxudercidae, subfamily Gobionellinae, described directly under its current combination.
Rhinogobius is one of the largest and most taxonomically active genera of East Asian freshwater gobies, with new species from China's river systems described regularly as fieldwork and molecular tools sharpen species boundaries within the genus's many regional species complexes. Unfortunately, the cached capture of the original description returned only the article's title and surrounding web-page navigation — no diagnostic or descriptive text was retrievable — so the morphological diagnosis that separates R. mengyangensis from its congeners is not available for this article. Only the locality and type data preserved in the Catalog of Fishes record can be reported with confidence.
Morphology
No morphological description of Rhinogobius mengyangensis was retrievable from the accessible sources for this article — the cached capture of the original ZooKeys paper contained only the title and page furniture, not the diagnosis, measurements, or meristic counts that would normally appear in a new-species description.
Like other members of the genus, R. mengyangensis can be expected to share the general Rhinogobius body plan — a small, elongate, laterally compressed goby with a broad head, high-set eyes, and the fused pelvic fins that form the characteristic sucker disc used to hold station in current. This is a genus-level generality, not a confirmed observation of this species, and should not be taken as a substitute for the actual diagnosis published in the description.
Habitat
The type locality is the Mengyang River at Mengyang Town, Pengzhou City, in the Chengdu City area of Sichuan Province, China, at approximately 30°57'37"N, 104°07'39"E. The Catalog of Fishes records the species' broader distribution as the Tuojiang and Minjiang River drainages of the middle Yangtze River basin in Sichuan Province, with a habitat listed simply as freshwater.
No specific water-chemistry or temperature data were retrievable for this species. Other Sichuan hillstream Rhinogobius — for example R. szechuanensis and R. xianshuiensis — occupy cool to warm-temperate, fast-flowing, well-oxygenated fresh water in roughly the 50–77 °F range; a similar regime is plausible for R. mengyangensis given its Sichuan Basin locality, but this is an estimate drawn from congeners, not a measurement of this species.
Feeding
No feeding data have been published for Rhinogobius mengyangensis specifically. Like other small stream-dwelling Rhinogobius, it is presumed to be a benthic micro-predator, picking small aquatic invertebrates — insect larvae, copepods and similar prey — from gravel and stones. This is a genus-level inference, not a direct observation of this species.
Mating
No mating behaviour has been documented for Rhinogobius mengyangensis. The great majority of Rhinogobius for which breeding biology is known are resident freshwater cave-spawners with genuine male parental care and no marine larval phase. Whether R. mengyangensis follows this pattern has not been confirmed in the accessible sources, but it is the default expectation for a freshwater-resident member of the genus.
Breeding
Rhinogobius mengyangensis has never been kept or bred in captivity — it is a 2026 description known only from its type series and has no aquarium-trade history. If it follows the resident cave-spawning pattern typical of most Rhinogobius, a female would lay adhesive eggs on the roof of a cave or crevice for the male to guard and fan until hatching, but this remains an inference from the genus rather than a documented account of this species.
In the aquarium
Rhinogobius mengyangensis is not present in the aquarium trade — it was described only in 2026 from a small scientific type series collected in Sichuan, and no import or hobbyist accounts exist. Should material ever reach the hobby, the general approach used for cool-water Chinese Rhinogobius would apply: a well-oxygenated, moderate-to-fast-flow tank with a gravel or cobble substrate, temperatures on the cool side of tropical rather than a heated community setup, small caves or crevices for territory and spawning, a tight-fitting lid (Rhinogobius are capable jumpers), and a diet of small live and frozen invertebrate foods rather than dry flake. These are genus-level cautions, not data specific to this species.
Conservation
Rhinogobius mengyangensis 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 the Mengyang River type locality and the broader Tuojiang and Minjiang River drainages of the middle Yangtze basin in Sichuan Province.
Sichuan's river systems have experienced substantial hydropower development, water abstraction and pollution pressure in recent decades, and newly described, narrow-range stream fishes are generally considered vulnerable to this kind of habitat change, though no species-specific threat assessment has been carried out for R. mengyangensis.