Taxonomy & naming
Microgenys lativirgata was described by Pearson in 1927 from specimens collected in the Río Púsac above Balsas in Peru, in the Marañón River drainage of the upper Amazon basin. Eschmeyer's Catalog of Fishes records the valid name as Microgenys lativirgata Pearson, 1927; the original spelling lativirgatus was later corrected to lativirgata to achieve proper gender agreement with the feminine genus name.
The genus Microgenys is a small characid lineage placed in the subfamily Creagrutinae by the Catalog of Fishes (FishBase additionally lists affinity with Stevardiinae, reflecting ongoing phylogenetic discussion). The genus contains only a handful of recognised species. The family-level assignment follows Eschmeyer's Catalog of Fishes, which remains the primary nomenclatural authority; the species is referred to Family Characidae in the broad sense. Animal Diversity Web lists the vernacular name Mojarita for this species.
Morphology
Microgenys lativirgata reaches a recorded maximum standard length of 3 in, making it a moderately small characid. Like other members of Microgenys, it has the elongate, fusiform body plan typical of swift-water or mid-current characins rather than the deep, compressed form of the open-water tetras.
Detailed meristic and colour data for this species remain sparse in the accessible literature. The species epithet lativirgata — from the Latin latus (broad) and virgatus (striped) — suggests a distinctively broad lateral stripe or banding pattern on the body, though thorough morphological descriptions are not available in the open literature consulted.
Habitat
The type locality is the Río Púsac above Balsas, a tributary of the Marañón River in northern Peru. The Marañón is one of the principal headwater systems of the Amazon, draining the Andes at elevations where streams are typically cool, clear, and fast-flowing over rocky or gravel substrates, with moderate to high dissolved oxygen.
The species is recorded in the Amazon River basin and is classified as a freshwater fish with epibenthic (bottom-associated) tendencies according to FishBase. The Marañón drainage spans a range of elevations and habitats, from Andean montane streams to lower, warmer foothill rivers; the precise microhabitat preferences of M. lativirgata within this system have not been described in detail in the available sources.
Feeding
Specific dietary data for Microgenys lativirgata have not been reported in the sources available for this profile. By analogy with related creagrutine or stevardiine characids from similar Andean-foothill habitats, the species is likely an opportunistic omnivore or insectivore, taking small invertebrates, terrestrial insects, and possibly plant matter from the water column and substrate.
Its epibenthic habit suggests some proportion of feeding may occur near or at the substrate surface, where invertebrate prey are most concentrated in Andean stream habitats. Data on this species' diet in the wild remain to be collected.
Mating
No specific observations of courtship or mating behaviour have been published for Microgenys lativirgata. As a characid, it almost certainly follows the broadly egg-scattering reproductive strategy characteristic of the family — open spawning with no pair bond and no parental care of eggs or fry.
Creagrutine and stevardiine characids from Andean headwater streams are generally presumed to spawn over substrates or among fine-leaved aquatic vegetation, with females scattering adhesive or semi-adhesive eggs. The specific seasonal or environmental triggers for spawning in this species, if any, are undocumented.
Breeding
Microgenys lativirgata has not been documented in aquarium breeding literature, and no captive-breeding accounts are available in the sources consulted for this profile. Given its obscurity in the hobby, there is no established protocol for breeding it in aquaria.
By analogy with related Andean characids, any breeding attempts would likely benefit from slightly cooler and well-oxygenated water reflecting the Marañón headwater environment, provision of fine-leaved plants or a substrate spawning medium, and removal of adults after spawning to protect eggs from predation. These are inferences from family-level patterns rather than documented observations for this species.
In the aquarium
Microgenys lativirgata is essentially unknown in the aquarium hobby. There are no established care guides, no records of import, and no hobbyist accounts in the sources available for this profile. The species' obscurity means that any aquarium keeping would be pioneering work.
Based on its Andean headwater origin, the species would be expected to require clean, well-oxygenated water with moderate flow, and cooler temperatures consistent with Marañón foothill streams. Its modest maximum size of 3 in SL suggests it could be kept in a mid-sized aquarium under appropriate conditions. Until more is known from field studies and any future aquarium introductions, specific husbandry recommendations cannot be given with confidence.
Conservation
Microgenys lativirgata is listed as Data Deficient (DD) on the IUCN Red List, an assessment reflecting the lack of sufficient information to determine its population size, distribution, or the threats it faces. The Data Deficient listing does not mean the species is not at risk; it means that the information required to evaluate its status has not been gathered.
The upper Amazon and Marañón drainages face ongoing pressures including habitat modification from agriculture, deforestation, mining, and hydroelectric development in the Andean foothills. As a range-restricted, poorly known species dependent on stream quality, M. lativirgata may be vulnerable to these pressures even though its current status cannot be formally evaluated. Basic survey work to establish its current range and abundance would be a first step toward a meaningful conservation assessment.