Taxonomy & naming
Stomatorhinus kununguensis was described by the Belgian ichthyologist Max Poll in 1945, part of a large body of work in which Poll documented and revised the mormyrid fishes of the Belgian Congo (now the Democratic Republic of the Congo). The species remains in the genus in which it was first placed — no subsequent revision moving it to another genus or reducing it to a synonym has been documented for this article — and Eschmeyer's Catalog of Fishes lists it as a currently valid species of Stomatorhinus. It belongs to the family Mormyridae, the elephantnoses and mormyrids, within the order Osteoglossiformes — the ancient bonytongue lineage of teleosts, named for a bony, toothed structure on the tongue that bites against toothed plates on the roof of the mouth.
The genus name Stomatorhinus is built from the Greek stoma (mouth) and rhinos (nose, snout), a reference to the small mouth set low and close to the tip of the snout that distinguishes the genus from other Congo-basin mormyrids. The specific epithet kununguensis follows the standard Latin toponymic pattern, formed with the locative suffix -ensis to mean 'of' or 'from' a place — evidently a locality named Kununga associated with Poll's original material — though the precise location has not been confirmed in the sources available for this article.
Morphology
No published measurements of maximum length, fin-ray counts or other morphometrics specific to Stomatorhinus kununguensis were accessible for this article. As a member of Stomatorhinus, it can be expected to share the general build of the genus: a laterally compressed body, a blunt, rounded snout, and — the defining trait of the genus — a small, inferior mouth set toward the underside of the head rather than at its tip. Most Stomatorhinus species are modest fish, mostly under 4 in in length, though no figure specific to this species is documented.
Like every mormyrid, S. kununguensis almost certainly carries a weak electric organ near the base of the tail, generating a pulsed discharge used for electrolocation and communication in murky water. No waveform, discharge rate or other electric-organ data specific to this species have been published.
Habitat
Stomatorhinus kununguensis is known from the Congo River basin, the setting for essentially all of the species Poll described in this genus, though the specific river system, drainage or locality beyond the type material has not been documented in the sources available for this article. Like other Stomatorhinus, it is presumed to inhabit the small forest streams and swamp habitat typical of the Congo basin's lowland forest zone — structurally complex, slow-flowing water where an electric sense outperforms eyesight — but no direct habitat description, water chemistry or depth data specific to this species has been published.
Feeding
No dietary study has been published for Stomatorhinus kununguensis. Mormyrids in general, including other Stomatorhinus species, are benthic foragers that use electrolocation to find small invertebrates — insect larvae, worms and tiny crustaceans — hidden in mud, sand and leaf litter, but this pattern has not been confirmed specifically for this species.
Mating
No courtship or mate-recognition behaviour has been described for Stomatorhinus kununguensis. In mormyrids generally, the electric organ discharge is species- and often sex-specific and is thought to play a role in recognising potential mates and rivals, but whether this applies to S. kununguensis cannot be said — no discharge waveform has even been recorded for the species, let alone its behavioural use.
Breeding
Breeding has not been recorded for Stomatorhinus kununguensis, in the wild or in captivity. The species is known essentially only from Poll's 1945 description, and no subsequent study appears to have examined its reproduction. Nothing about spawning behaviour, fecundity or parental care can be stated with any confidence.
In the aquarium
Stomatorhinus kununguensis has no known history in the aquarium hobby and does not appear to have been collected for the trade. Like most of the smaller Congo mormyrids, it is essentially unknown outside the taxonomic literature that first described it. General mormyrid husbandry would apply if it were ever kept: a soft substrate for probing, dim lighting, ample cover, and live or frozen invertebrate foods rather than flake or pellet, since mormyrids as a group are notably sensitive to poor water quality and to many common medications. None of this reflects an actual keeping record for this species, and should be read as general genus-level guidance rather than an account of S. kununguensis in an aquarium.
Conservation
Stomatorhinus kununguensis has not been evaluated by the IUCN Red List. No population, range-extent or threat data specific to the species have been published, and its conservation status is presently unknown rather than assumed secure. As with many small, poorly surveyed Congo-basin mormyrids, the main obstacle to assessment is a lack of recent survey data rather than any documented decline.