Taxonomy & naming
Oxyropsis wrightiana was described by Carl H. Eigenmann and Rosa Smith Eigenmann in 1889. It is the type-bearing context for one of the small hypoptopomatine genera, and the Catalog of Fishes (Eschmeyer, CAS) and FishBase both recognise Oxyropsis wrightiana as a valid name. The genus was revised by Aquino and Schaefer in 2002 (Copeia 2002(2): 374–390), a study that re-examined the limits and relationships of the included species.
The fish sits within the subfamily Hypoptopomatinae, the lineage of small, slender loricariids that also contains the familiar Otocinclus and Hypoptopoma. The species epithet wrightiana honours Robert Ramsay Wright (1852–1933), a Scottish-born zoologist.
Morphology
Oxyropsis wrightiana is a small loricariid reaching about 2 in standard length (SL). In common with other hypoptopomatines it has a slender, somewhat flattened body sheathed in the bony lateral plates typical of the subfamily. The genus name itself points to a tapering, pointed-tail body form (from the Greek for 'sharp' and 'tail').
Detailed published descriptions of coloration and external sexual dimorphism for this species are limited; the genus-level revision by Aquino and Schaefer (2002) provides the modern morphological framework. No reliable account of sexual dimorphism is available in the sources consulted.
Habitat
The species occurs in the middle and upper Amazon River basins of South America. It is a freshwater, demersal (bottom-associated), tropical fish.
Beyond this broad distributional and ecological characterisation, finer habitat detail — preferred microhabitat, water chemistry, depth, and seasonal movement — has not been published in the sources available here. As a small hypoptopomatine it is most plausibly associated with vegetated margins, leaf litter, or submerged structure in slower waters, consistent with relatives in the subfamily, but this is not specifically documented for O. wrightiana.
Feeding
No dedicated feeding study has been published for Oxyropsis wrightiana. Members of the subfamily Hypoptopomatinae are typically grazers of aufwuchs — the film of algae, microorganisms, and detritus coating submerged surfaces — and a comparable diet is the reasonable expectation for this small demersal species, but its specific feeding ecology has not been documented.
Mating
No data on courtship or mating behaviour have been published for Oxyropsis wrightiana. The species is not maintained in the aquarium hobby, and the literature consulted addresses taxonomy and morphology rather than reproductive behaviour.
Breeding
No data on reproduction, spawning mode, clutch size, or parental care have been published for Oxyropsis wrightiana. There are no wild breeding observations and no captive breeding accounts.
In the aquarium
Oxyropsis wrightiana is not present in the aquarium hobby. It carries no L-number and is not imported for the ornamental trade, so there are no husbandry, compatibility, or breeding reports. While its small size and grazing habits would superficially suggest a peaceful aufwuchs-feeder along the lines of the hobby's otocinclus, the species is in practice unavailable and undocumented in captivity.
Conservation
The IUCN Red List assessed Oxyropsis wrightiana as Least Concern (LC) on 21 November 2020. The classification reflects a wide distribution across the middle and upper Amazon basin and no evidence of significant population decline. No specific threats to the species have been documented.