Taxonomy & naming
Chiloglanis batesii was described by the Belgian-British ichthyologist George Albert Boulenger in 1904. It belongs to the family Mochokidae, the African squeakers and upside-down catfishes, and to the genus Chiloglanis, a large group of small suckermouth mochokids often called "suckertooth" or "rock" catfishes. The Catalog of Fishes and GBIF both treat Chiloglanis batesii as the valid, currently accepted name, with no indication that this species has moved genera since its description.
The genus name Chiloglanis derives from Greek roots referring to the modified lips that form the animal's characteristic sucking disc, a feature shared across the genus and used to anchor the fish to rock in fast-flowing water. As with many small West and Central African stream fishes, Chiloglanis batesii is easy to confuse with related congeners in the field, and identification typically relies on fin-spine and disc details rather than colour pattern alone.
Morphology
Chiloglanis batesii is a small, dorsoventrally flattened catfish reaching only about 1.5 in standard length, among the smallest catfishes covered in this atlas. The head is broad and depressed, and the underside of the mouth is modified into a disc-like sucker formed from the lips, an adaptation shared by the whole genus for holding position against current on rock surfaces.
Like other mochokids it carries stiff, serrated spines at the leading edge of the dorsal and pectoral fins that can lock erect; even at this small size these spines can catch in netting, so the fish is easiest to move in a container of water rather than a net. FishBase records sexual dimorphism in the genus pattern typical of Chiloglanis: males develop an enlarged caudal fin and a more rounded humeral process than females. The skin, as in all mochokids, is naked and scaleless rather than plated or scaled.
Habitat
The species is native to West and Central Africa, recorded from the Niger River basin, headwaters of the Chad basin, and river systems across Cameroon (with the apparent exception of the Ndian and Nyong drainages). FishBase describes it as a freshwater-to-brackish, benthopelagic fish of these river systems.
Chiloglanis species as a group are specialists of fast-flowing, well-oxygenated rocky streams and rapids, where the sucking disc lets them cling to stone surfaces that would sweep a free-swimming fish downstream. Typical tropical West/Central African river conditions apply — warm water in roughly the 20–26 degrees C range — though the cache does not provide a directly measured pH or hardness range for this specific species, so those figures should be treated as a reasonable estimate for its river habitat type rather than a confirmed reading.
Feeding
Chiloglanis batesii is a benthic omnivore with micro-predatory tendencies, reflected in FishBase's recorded trophic level of roughly 3.1. In the wild it forages over rock and stone surfaces, grazing algae and biofilm and picking at small invertebrates, mostly after dark, in keeping with the largely nocturnal habits typical of the genus and the wider squeaker family.
In an aquarium setting this diet translates to sinking pellets and wafers with a vegetable or algae component, supplemented with small live or frozen invertebrate foods such as bloodworm or brine shrimp. Because it is a nocturnal bottom-grazer, some food should be offered after lights-out so it is not out-competed by more visible, day-active tankmates.
Mating
FishBase records Chiloglanis batesii as oviparous with distinct pairing during breeding, and notes the sexual dimorphism used to distinguish the sexes: males have an enlarged caudal fin and a more pronounced, rounded humeral process than females. Beyond that pairing behaviour, the cache holds no further detail on courtship or spawning site selection for this species, and none should be assumed.
Breeding
Breeding biology for Chiloglanis batesii is not well documented, and this species is not known to be regularly bred in home aquaria. The available source material confirms only that it is oviparous with distinct male-female pairing at spawning; it does not describe a nest, egg-guarding, or fry-rearing behaviour, so no parental-care mode should be inferred. Given how little is published on the genus's reproductive habits generally, the honest position is that its breeding remains largely undescribed rather than assignable to one of the better-known catfish reproductive strategies (bubble-nesting, cave-spawning, internal fertilisation, or brood parasitism).
In the aquarium
At a maximum of roughly 1.5 in, Chiloglanis batesii is genuinely one of the smallest catfish in this atlas and does not carry the size trap that catches so many mochokid keepers — but it does carry the other hallmarks of the family. Its skin is naked and scaleless, so it is medication-sensitive in the same way as loaches, puffers and eels: dose copper-based treatments and many standard medications conservatively, often at reduced strength. It also carries small but genuinely locking, serrated dorsal and pectoral spines, so it should be scooped in a container rather than chased with a net.
As a specialist of fast, well-oxygenated rocky streams, it needs strong water flow, high dissolved oxygen and rock or smooth-stone surfaces to grip rather than soft substrate or dense planting alone. It is best kept in a river-biotope-style setup with a powerful filter or powerhead creating current, biofilm-covered stone for grazing, and subdued lighting or cover for daytime hiding, since it is primarily active after dark. This is a specialist's fish rather than a generalist community catfish, and it should not be housed in a still-water tank.
Conservation
The IUCN Red List assesses Chiloglanis batesii as Least Concern, an assessment dated 2019. It has a reasonably broad distribution across the Niger basin, Chad basin headwaters and most of Cameroon's river systems, which supports a low-concern rating at present.
As with other small rheophilic (current-loving) African stream fishes, its long-term outlook is tied to the health of fast-flowing river habitat specifically — siltation, damming, and degradation of rocky rapids habitat are the kinds of pressures that could affect populations even where the species is not presently threatened at range-wide scale.