Taxonomy & naming
Hyphessobrycon ericae was described by Moreira & Lima in 2017 in the journal Zootaxa (volume 4318, number 1), as one of two new Hyphessobrycon species from the Amazon basin of Brazil. The type locality is a terra firme stream in Pará state. Eschmeyer's Catalog of Fishes recognises Hyphessobrycon ericae Moreira & Lima, 2017 as the valid name; the species sits within the large, diverse genus Hyphessobrycon of the family Characidae.
The species' closest known relative is H. wosiackii, described in the same paper. The two are sisters in distribution and overall patterning, but H. ericae is distinguished by its vertically elongated (arrow-like) humeral spot, whereas H. wosiackii carries an anteriorly rounded humeral spot. Both species share a humeral blotch that merges with a dark anterior band restricted to the forward portion of the body, and both have a caudal peduncle blotch — a suite of characters that separates them as a pair from other Hyphessobrycon congeners occurring in the same region.
The specific epithet honours Érica Pellegrini Caramaschi, a Brazilian ichthyologist recognised for her contributions to Neotropical freshwater fish ecology. No common name has been widely established in either the scientific or hobby literature.
Morphology
Hyphessobrycon ericae is a small tetra reaching a maximum standard length of approximately 1.5 in, the size recorded from male and unsexed specimens. Like other members of Hyphessobrycon it is a slender, laterally compressed characid with the typical small-tetra body plan: a moderately elongate form, a forked tail, and the adipose fin characteristic of the family.
The most diagnostic external feature is the humeral blotch, which is vertically elongated and arrow-like in shape and merges anteriorly with a dark midlateral band; this band becomes blurred posteriorly along the flank rather than remaining sharply defined to the base of the tail. A distinct blotch is also present on the caudal peduncle. The combination of the arrow-like humeral spot, the fading midlateral band, and the caudal peduncle mark is the key to field and laboratory identification. Meristic counts include 10–11 dorsal soft rays, 19–25 anal soft rays, and 32–34 vertebrae. Detailed colour description in live animals remains sparse in the published literature.
Habitat
Hyphessobrycon ericae inhabits first-order terra firme streams — shallow, small headwater watercourses within non-flooded upland forest — in the lower rio Trombetas basin, the adjacent rio Jamari basin to the north of the Amazon River mainstem, the rio Curuá-Una basin to the south, and tributaries of the middle rio Madeira. These drainages fall within the states of Pará, Amazonas, and Rondônia in Brazil.
The streams it occupies are characteristically clearwater: low in suspended sediment, often tannin-tinged or neutrally clear, with sandy substrates and abundant aquatic vegetation. FishBase categorises the species as benthopelagic and tropical. The first-order stream context implies shallow, narrow channels with broken cover from overhanging and submerged vegetation, leaf litter banks, and woody debris — the kind of microhabitat typical of small Hyphessobrycon tetras across the Amazon basin.
Feeding
Field dietary data recorded for H. ericae indicate a diet dominated by terrestrial and aquatic invertebrates, with a strong representation of winged and wingless ants alongside small aquatic beetles and vegetal matter. A trophic level of 2.9 (FishBase) is consistent with a generalist insectivore-omnivore, near the base of the food web rather than a top predator.
The reliance on ants and beetles suggests the species is an active opportunistic forager at the water surface and near the bottom, exploiting both falling terrestrial prey and bottom-associated invertebrates in its shallow stream habitat. In captivity, small Hyphessobrycon species of similar ecology accept good-quality flake, micro-pellets, and small frozen or live foods such as Daphnia, artemia nauplii, and bloodworm without difficulty, though specific aquarium dietary data for H. ericae itself are not yet documented in the hobby literature.
Mating
No dedicated study of the reproductive behaviour of H. ericae has been published. Based on its placement within Hyphessobrycon and the ecology of similar small Amazonian characids, the species is expected to follow the typical egg-scattering pattern of the genus: males pursue females among fine-leaved aquatic vegetation or at the substrate surface, and pairs or small groups scatter adhesive eggs among plants or leaf litter with no subsequent parental guarding.
For most small Hyphessobrycon tetras, spawning is triggered by slight increases in water temperature and rainfall-related cues in the wild, and by water changes and conditioning in captivity. Given the first-order clearwater stream habitat, breeding likely occurs during or following seasonal rainfall events that flush the streams. No observations of courtship colour changes, mate-choice behaviour, or spawning site fidelity specific to this species have been recorded.
Breeding
Captive breeding records for H. ericae are absent from the available literature as of the time of writing. The species was described only in 2017 and has not yet entered the mainstream hobby to any recorded extent, so formal aquarium breeding accounts do not exist.
By analogy with closely related Hyphessobrycon from terra firme clearwater streams, eggs would be expected to be small, adhesive, and deposited among fine-leaved plants or spawning mops, with incubation on the order of 24–48 hours at tropical temperatures and larvae becoming free-swimming within a few days. Adults would offer no parental care and should be removed after spawning. First foods for fry of small Hyphessobrycon species are typically infusoria, rotifers, or commercial liquid fry preparations. These expectations are inferred from genus-level patterns; breeders encountering this species for the first time should treat them as provisional.
In the aquarium
Hyphessobrycon ericae is not yet established in the mainstream aquarium hobby and rarely if ever appears in the commercial trade as of 2025. Its natural habitat — shallow, shaded, first-order clearwater terra firme streams — suggests it would be best kept in a soft, slightly acidic to neutral, well-planted aquarium with subdued lighting and a dark substrate, conditions that replicate the tannin-influenced, plant-dense microhabitats of Amazonian headwater streams.
As a small characid of approximately 1.5 in, it would be suited to a nano or species tank in the 10–20 US gal range if kept as a group. Like most small Hyphessobrycon, it is likely a peaceful schooling fish that would fare best with conspecifics and similarly sized, non-aggressive tankmates from comparable habitats. The diet of ants and beetles in the wild suggests it would benefit from occasional live or frozen invertebrate foods beyond standard flake. Dedicated aquarists working with newly described Amazonian tetras are best positioned to develop husbandry data for this species; such observations would be a genuine contribution to knowledge given the absence of published captive records.
Conservation
Hyphessobrycon ericae has not been assessed by the IUCN Red List as of 2025 (status: Not Evaluated, NE), reflecting the recency of its description and the lag between species discovery and formal conservation evaluation that is common among newly described Amazonian small fishes.
The species is known from a relatively broad geographic footprint spanning the lower Trombetas, Jamari, Curuá-Una, and middle Madeira basins across three Brazilian states, which suggests it is not immediately at acute risk from range restriction alone. However, the terra firme stream habitats it occupies in Pará, Amazonas, and Rondônia are under pressure from ongoing deforestation, agricultural conversion, and infrastructure development throughout the Brazilian Amazon. Small first-order streams are disproportionately affected by riparian clearance and sediment loading. A formal IUCN assessment with range-size calculations and population trend data would be a valuable next step for understanding its conservation needs.