Taxonomy & naming
Pareiorhina hyptiorhachis was described by Silva, Roxo and Oliveira in 2013, in the original description published in ZooKeys (No. 313, p. 67, with figures of the type material). The type locality is Ribeirão Fernandes, a tributary of the rio Pomba within the rio Paraíba do Sul basin, at 21°14'47"S 43°34'07"W near Santa Bárbara do Tugúrio, Minas Gerais State, Brazil. No synonyms are recognised.
The species belongs to the genus Pareiorhina, placed in this project's scheme within the subfamily Neoplecostominae — a group of small, stream-dwelling South American suckermouth catfishes (FishBase files the genus under Hypoptopomatinae, reflecting the unsettled higher classification of these fishes). The Catalog of Fishes (Eschmeyer, CAS) recognises the valid combination. No L-number or established common name is associated with the species.
Morphology
Pareiorhina hyptiorhachis is a small loricariid; precise size data are not reported in the cached references, though congeneric Pareiorhina species mature at roughly 1.5–2 in SL. As a neoplecostomine, it has the typical loricariid body armour of bony scutes and a ventral suckermouth adapted to clinging in flowing water.
The specific epithet hyptiorhachis derives from Greek elements meaning roughly 'arched ridge' (hyptios, bent back, and rhachis, spine or ridge), apparently referring to a feature of the dorsal profile or predorsal ridge — a diagnostic character used in the original description. Detailed meristics and coloration from the description are not reproduced in the cached notes and are not invented here.
Habitat
The species is known from the rio Pomba drainage of the rio Paraíba do Sul basin in Minas Gerais, Brazil, including the type locality at Ribeirão Fernandes. It is a freshwater, demersal fish of tropical waters.
The type locality is a small tributary stream, consistent with the headwater, riffle-dwelling habits typical of Pareiorhina and other neoplecostomines, which cling to stones and submerged surfaces in clear, well-oxygenated flowing water. Specific recorded water parameters (temperature, pH) are not published in the cached sources.
Feeding
No species-specific feeding study is available in the cached references. Small neoplecostomine loricariids are generally grazers of periphyton and biofilm on rocks and submerged surfaces, but a documented diet for Pareiorhina hyptiorhachis is not recorded here, so feeding ecology is left as no data published.
Mating
No mating or courtship behaviour has been described for Pareiorhina hyptiorhachis. Reproductive behaviour in the wild is unreported in the cached sources.
Breeding
There is no breeding report for this species in the available references — the original description notes no reproductive data. Spawning mode, clutch size, and parental care are unknown, and there are no aquarium breeding accounts.
In the aquarium
Pareiorhina hyptiorhachis is not present in the aquarium trade and has no documented husbandry. As a recently described headwater stream fish from a restricted drainage, it is of scientific rather than hobby interest.
Any inference about care would have to be drawn from the genus generally — small, riffle-dwelling grazers requiring cool to warm, clean, fast-flowing, well-oxygenated water with stony substrate — but no tested husbandry protocol exists for this species, and none is asserted here.
Conservation
The IUCN Red List assessed Pareiorhina hyptiorhachis as Least Concern in 2018. Although the known range is restricted to the rio Pomba drainage, the assessment placed it in the lowest-concern category. The upper rio Paraíba do Sul basin is subject to regional pressures including agriculture, deforestation, and water-quality degradation, but no species-specific threat or documented decline is itemised in the cached sources.