Taxonomy & naming
Pollimyrus tumifrons was described by the Belgian-born British ichthyologist George Albert Boulenger in 1902. It is currently classified in the genus Pollimyrus, within the family Mormyridae — the elephantnoses and mormyrids — in the order Osteoglossiformes, the ancient bonytongue lineage of teleost fishes named for a bony, toothed structure on the tongue that bites against a matching plate on the roof of the mouth. Pollimyrus is a genus of small, weakly electric mormyrids known in the literature as dwarf stonebashers, set apart from long-snouted relatives such as Gnathonemus by a short, unmodified mouth rather than a trunk-like chin organ.
The original description, the type locality, and any synonymy affecting this name are not documented in the sources available for this account. What can be stated with confidence is the current valid combination and placement — Pollimyrus tumifrons (Boulenger, 1902) in the genus Pollimyrus — rather than the fuller nomenclatural history that a species description of this age usually carries.
Morphology
Specific measurements for Pollimyrus tumifrons — standard length, body depth, fin-ray counts — are not documented in the sources available for this account, and no figure is invented here to fill that gap. In general build, Pollimyrus species are small, laterally compressed mormyrids with a short, unspecialized mouth set near the tip of the snout, a body plan suited to slow, deliberate movement through cover rather than open water.
As in every other mormyrid, an electric organ near the base of the tail almost certainly gives this species a weak, pulse-type electric field that it reads through electroreceptors spread across its skin — the sense mormyrids use in place of vision in dark or turbid water. The family carries some of the largest brain-to-body mass ratios of any vertebrate group, with an enlarged cerebellum devoted to processing this electrosensory stream. No discharge waveform or other electric-organ detail specific to Pollimyrus tumifrons has been published; that kind of study has so far concentrated on a handful of well-studied congeners rather than on this species.
Habitat
No river system, country, or habitat type is documented for Pollimyrus tumifrons in the sources available for this account. The genus Pollimyrus as a whole is distributed across freshwater systems in West, Central, and southern Africa, but assigning this particular species to any one of those basins without a confirmed record would be guesswork rather than reporting, and this profile does not do so.
Temperature, pH, and other water-chemistry figures are likewise unrecorded for this species and are left out here rather than estimated from the wider family.
Feeding
Diet has not been studied in Pollimyrus tumifrons specifically. Mormyrids generally are benthic invertebrate feeders, using electrolocation to find prey such as insect larvae, worms, and small crustaceans hidden in mud, sand, or leaf litter, then taking it with a quick strike of the small, downturned mouth. Whether this species follows that pattern in the same way, and what it might take in captivity, is not documented.
Mating
Courtship and mate recognition have not been described in Pollimyrus tumifrons. In the same genus, Pollimyrus isidori is a well-studied laboratory subject for acoustic courtship: males produce distinct grunts and moans that, together with the electric organ discharge, appear to function in species and sex recognition around spawning. That body of work is specific to P. isidori and does not extend to Pollimyrus tumifrons in the published record, and this profile does not assume the two species behave alike.
Breeding
No spawning account, wild or captive, has been published for Pollimyrus tumifrons. Breeding biology across the genus Pollimyrus is patchy even for its best-known species, and for most congeners — this one included — reproduction has never been documented, let alone achieved in an aquarium. Any description of eggs, parental care, or spawning triggers for this species would be invention rather than a reported observation.
In the aquarium
Pollimyrus tumifrons has no documented history in the aquarium trade or hobby literature, and this profile makes no claim that it does. What follows is general mormyrid husbandry, not species-specific experience: a soft sand substrate the fish can probe with its mouth, dim lighting with ample cover, and stable water quality, since mormyrids as a group tolerate poor conditions badly and are sensitive to many common aquarium medications, copper-based treatments in particular. Live and frozen invertebrate foods such as bloodworm and brine shrimp are the standard diet for the family, best offered after dark to match a foraging rhythm built around low light.
Anyone who does encounter this fish in trade — most likely sold generically as a small mormyrid rather than under its own name — should treat these general notes as a starting point, not a verified care record for this particular species.
Conservation
No IUCN Red List status could be located for Pollimyrus tumifrons in the sources available for this account, and none is reported here as a substitute for a real assessment. Species-specific threats are similarly undocumented. General pressures on small, range-restricted African freshwater fish — habitat degradation, siltation, and water-quality decline in whatever river system this species occupies — are a reasonable background concern for the genus, but that is inference, not a documented finding for this species.