Taxonomy & naming
Popta described the species in 1904 as a variety, which is why the Catalog of Fishes writes the authority as (var. Popta 1904). It is valid in Crossocheilus. The type comes from the Bo River in central Borneo.
Morphology
A slender, grazing cyprinid that FishBase gives at a maximum of 5.5 in TL. The name nigriloba suggests a dark lobe, probably on the tail, but this has not been described in detail.
Habitat
It is known from Borneo, with the type locality in the Bo River of the central island; FishBase lists the range as East Borneo, in freshwater of tropical conditions. Water parameters have not been published.
Feeding
Crossocheilus graze algae and biofilm and take small invertebrates.
Mating
Mating behaviour has not been described.
Breeding
Captive breeding has not been documented.
In the aquarium
A tank with flow, high oxygen and hard surfaces to graze suits the genus. Keep a group. Care notes are based on related species.
Conservation
The IUCN Red List category is Least Concern, assessed in 2019. Threats have not been described.