Taxonomy & naming
Rineloricaria cachivera was described in 2023 by Urbano-Bonilla, Londoño-Burbano and Carvalho in the Journal of Fish Biology, volume 103 (pages 1073-1084), in a paper titled 'A new species of rheophilic armored catfish of Rineloricaria from the Vaupés River, Amazonas basin, Colombia.' The Catalog of Fishes (Eschmeyer, CAS) recognises it as valid (species id 77397), and FishBase carries it under SpecCode 71199.
The species belongs to Rineloricaria, the species-rich whiptail genus of subfamily Loricariinae within the armoured catfish family Loricariidae. It is one of relatively few Rineloricaria recorded from the upper Rio Negro drainage and is notable for its adaptation to fast-flowing rapids habitat.
The specific epithet cachivera derives from a local term for water flowing violently among rocks, a direct reference to the rheophilic, rapids-dwelling habitat in which the species was collected.
Morphology
Rineloricaria cachivera reaches at least 5 in standard length (largest measured male or unsexed specimen). It shows the elongate, flattened, whip-tailed body of the genus, armoured in overlapping bony plates and tapering to a long, slender tail.
The original description diagnoses the species by a distinctive combination of characters: an ill-defined curved transverse dorsal band just anterior to the first predorsal plate that mirrors a band on the anterior border of the snout; dark, diffuse blotches that merge into a unified dark coloration over most of the dorsal surface of the head, without bands or spots; a long snout exceeding half the head length (58.0-66.3% of head length); a naked cleithral region running from the lower-lip border to the pectoral-fin origin; five series of lateral plates below the dorsal fin; six branched pectoral-fin rays; and a lower lip bearing short, thick papillae. Recorded fin-ray counts are one dorsal spine with seven soft dorsal rays and five soft anal rays.
Habitat
Rineloricaria cachivera is known from the Vaupés River in the upper Amazonas basin (Rio Negro drainage) of Colombia. It is a freshwater, demersal, tropical fish, and explicitly rheophilic, inhabiting rapids where water flows fast among rocks, the very setting that gives the species its name.
This rapids-dwelling habit distinguishes it ecologically from many congeners that occupy slower sand- and litter-bottomed reaches. As with other Rineloricaria, facultative air-breathing is a trait of the genus, though detailed water-chemistry data specific to its collection sites are confined to the original description.
Feeding
No dedicated dietary study of Rineloricaria cachivera has been published. Its FishBase trophic level of 2.6 indicates a low-level omnivore, consistent with the genus, whose members rasp biofilm, algae, microorganisms and fine detritus from rock and other submerged surfaces, an especially well-suited feeding mode in the algae-rich rapids it inhabits.
Beyond this general inference from genus biology and habitat, no species-specific feeding observations exist.
Mating
No mating or courtship behaviour has been documented for Rineloricaria cachivera. Whiptail catfishes of this genus generally spawn in crevices or tubes with male attendance, but no observation specific to this rapids-dwelling species exists, and nothing about its reproductive behaviour should be asserted.
Breeding
There are no published breeding reports for Rineloricaria cachivera. Many Rineloricaria are substrate egg-layers with paternal care, but whether this species conforms to that pattern is unrecorded. No data published.
In the aquarium
Described only in 2023 and known from remote Colombian rapids, Rineloricaria cachivera has no established presence in the ornamental trade, no L-number, and no hobbyist husbandry record. Any care guidance would be extrapolation rather than experience.
Given its rheophilic habitat, a fish of this type would require strong, well-oxygenated flow over rocky substrate rather than the calmer setups suited to sand-dwelling whiptails. Because no specific husbandry has been recorded, it should be treated as an undocumented, specialist rapids species and approached only through general rheophilic Rineloricaria principles.
Conservation
Rineloricaria cachivera has not been evaluated by the IUCN Red List, as expected for a species described in 2023. No conservation status or population data are available.
Its known range in the Vaupés River rapids of the Colombian Amazon is relatively remote, but Amazonian river systems face broad pressures from mining, deforestation and hydrological change. A formal assessment would require targeted survey and population information.