Taxonomy & naming
Distichodus microps was formally described by Schmidt, Knobloch & Barrientos in 2021 in Zootaxa, based on a holotype and presumably additional material collected from the Mbia River drainage in Equatorial Guinea. It belongs to the family Distichodontidae within the order Characiformes, a largely African radiation of characins that includes the plant-grazing Distichodus species, the small predatory Neolebias and Nannaethiops, and their citharinid relatives. The genus Distichodus is recognised by the Catalog of Fishes (Eschmeyer, California Academy of Sciences) as the valid combination for this species; no synonymy or reassignment is documented.
The species epithet "microps" reflects the diagnostic feature used to separate it from its congeners: a distinctly small eye relative to snout length, with eye diameter running 56.7-80.4% of snout length in the type material, well below the proportions seen in most other described Distichodus. Other diagnostic characters cited in the description include a nearly inferior (underslung, downward-facing) mouth and a lateral-line scale count of 41. As a species described only in 2021, D. microps has not yet accumulated the secondary literature, common names or hobby history that surround older, more widespread members of the genus.
Morphology
The holotype of Distichodus microps measured 4 in (4 in) standard length, making it a small species within a genus that ranges from modest nano-sized forms up to the much larger, deep-bodied D. sexfasciatus and D. lusosso kept in the aquarium trade. Beyond the diagnostic small eye, nearly inferior mouth and 41 lateral-line scales noted in the original description, detailed published morphological data — body depth, fin ray counts, colouration in life — is not available in the sources consulted here.
Like other Distichodus, it can be expected to share the family's generalised elongated-to-moderately-deep body form and the downward-oriented, sucker-like mouth typical of substrate- and vegetation-grazing characins, but this is an inference from the genus rather than a documented feature of this specific species. Readers should treat any claim about this species' colour pattern or exact body proportions as unconfirmed until further material or photographs are published.
Habitat
Distichodus microps is known only from the Mbia River drainage in coastal Equatorial Guinea, a small, isolated lowland river system that drains the narrow strip of West Central African coast between the larger Ntem and Mbini (Benito) river basins. The holotype was collected at a low elevation of roughly 105 ft, consistent with a lowland forest stream rather than an upland or highland habitat.
No direct water-chemistry measurements for the type locality have been published in the sources available. Based on the regional hydrogeology of West Central African coastal drainages — warm equatorial lowland forest streams — water in the Mbia system can be presumed to run warm and soft to slightly acidic, but this is a regional inference, not a measured value for this species, and should be treated accordingly.
Feeding
No diet study has been published specifically for Distichodus microps; its natural feeding ecology is undocumented. The genus Distichodus as a whole is characterised by an omnivorous, largely herbivorous grazing habit — species feed on soft aquatic vegetation, algae, detritus, and incidentally on worms and small bottom-dwelling invertebrates, using their downward-angled mouths to graze substrate and plant surfaces.
In the absence of species-specific data, it is reasonable to expect D. microps follows the same general grazing pattern as its relatives, but this remains an assumption carried over from the genus rather than an observed fact about this particular species. No aquarium feeding reports exist for it.
Mating
Courtship and pairing behaviour in Distichodus microps have not been described. No external sexual dimorphism has been reported for this species in the taxonomic literature, and given that the original description is a morphological species account based on a small type series, this is not a research gap so much as data that simply does not yet exist.
Breeding
There is no documented breeding record for Distichodus microps, in the wild or in captivity. More broadly, Distichodus and its citharinid relatives are egg-scatterers that are only rarely bred at home in the aquarium hobby; larger, more established Distichodus species are believed to migrate upriver and spawn in response to seasonal rains, but even that pattern has not been confirmed for this species specifically. Given its very recent description and apparent absence from the aquarium trade, it is honest to say that nothing is known about how — or whether — this species reproduces in captivity.
In the aquarium
Distichodus microps does not appear to be established in the aquarium trade; the sources consulted here show no evidence it has been imported, bred or kept by hobbyists. Its modest size at maturity (the holotype was 4 in SL) would, in principle, make it far more tractable than the large plant-shredding Distichodus species that outgrow typical home tanks, but any care recommendations would be speculative in the absence of real husbandry experience with this species.
Prospective keepers of the genus more broadly should expect Distichodus to graze on live plants, so any tank intended for this species — should it ever reach the hobby — would sensibly follow general genus practice: robust or artificial planting, vegetable-forward feeding, and a group setting, since most Distichodus are more settled in numbers. None of this is confirmed for D. microps itself.
Conservation
Distichodus microps has not been assessed by the IUCN Red List and currently carries a status of Not Evaluated, which is unsurprising for a species described only in 2021. Its known range is restricted to a single small coastal drainage in Equatorial Guinea, a geographically narrow distribution that would typically warrant conservation attention once formal assessment data becomes available, particularly given the general pressures — deforestation, coastal development and water-quality change — facing small West African lowland river systems. Until an assessment is carried out, its conservation status should be considered genuinely unknown rather than assumed safe.