Brazil country information

Common names: [No common name]
Occurrence: native
Salinity: freshwater
Abundance: | Ref:
Importance: | Ref:
Aquaculture: never/rarely | Ref:
Regulations: no regulations | Ref:
Uses: no uses
Comments: Type locality of Hyphessobrycon myrmex, Mato Grosso, Campos de Júlio, Rio Formiga at PCH Divisa, upper Rio Juruena, Rio Tapajós basin. The Rio Formiga is a right-bank tributary of the Rio Juína, in the headwaters of the Rio Juruena, a hydroelectric reservoir (PCH Divisa) was built here in 2010. Before the dam construction, Rio Formiga, with an area of 6·8 km2, would have resembled the adjacent up and downstream areas of the river, i.e. a relative narrow (10-15 m wide) and shallow (maximum depth ca. 1·8 m in some sites) river stretch, characterized by rapid waters and rifles (Ref. 128641).
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Country Information: https://www.cia.gov/library/publications/resources/the-world-factbook/geos/br.html
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Occurrences: Occurrences Point map
Main Ref: Pastana, M.N.L. and F.C.P., Esguicero, A.L.H. Dagosta, 2017
National Database:

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> Characiformes (Characins) > Characidae (Characins; tetras) > Stethaprioninae
Etymology: Hyphessobrycon: Greek, hyphesson, -on, -on = a little smaller + Greek, bryko = to bite (Ref. 45335); myrmex: Name from Greek word for ant, referring to the small size of adult specimens of the species and also refers to the type locality, the Rio Formiga, which means ‘Ant River’ in Portuguese..

Environment: milieu / climate zone / depth range / distribution range Ecologie

; zoet water benthopelagisch. Tropical

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South America: Brzail.

Grootte / Gewicht / Leeftijd

Maturity: L_m ? range ? - ? cm
Max length : 2.4 cm SL mannelijk / geslacht onbekend; (Ref. 128641)

Korte beschrijving Morfologie | Morfometrie

This species is distinguished from all its congeners, except Hyphessobrycon agulha, H. clavatus, H. herbertaxelrodi, H. klausanni, H. loretoensis, H. lucenorum, H. margitae, H. metae, H. mutabilis, H. peruvianus, H. wadai, by having the lower half of body deeply pigmented with dark chromatophores, mainly above the anal fin, forming a broad, diffuse, dark midlateral stripe (vs. no longitudinal stripe, narrow stripe starting approximately at vertical through the dorsal-fin origin, or relatively narrow, well-defined, dark midlateral stripe on body extending from the posterior margin of the eye to the middle caudal-fin rays); with high concentration of dark chromatophores along unbranched dorsal-fin rays and distal portions of the two or three subsequent branched rays (vs. dark chromatophores absent or, when present, only scattered on fin) (Ref. 128641).

Found where water is transparent and the river bottom is composed of stones, sand and a moderate amount of vegetal debris. The type locality which is a hydroelectric reservoir (PCH Divisa) built in 2010 in the Rio Formiga, occupy an area of 6·8 km2. Before the dam was built, this place would have resembled the adjacent up and downstream areas of the river, i.e. a relative narrow (10–15 m wide) and shallow (maximum depth approximately 1·8 m in some sites) river stretch, with rapid waters and rifles. Stomach contents revealed a diet based on filamentous algae (c. 10%), vascular plant tissue (c. 6%), microcrustaceans (c. 10%), Chironomidae larvae (c. 10%) and Ephemeroptera nymphs (c. 64%). It may be considered an omnivorous species based on the main food resources exploited, but may have tendency toward invertivory. Approximately 50% of the analysed specimens had parasitic isopods (Cymothoidae) associated with the tongue. Specimens with this parasites exhibited a bag-shaped lower jaw, tongue atrophy and softening of the cartilaginous tissues (Ref. 128641).

Levenscyclus en paargedrag Maturiteit | Voortplanting | Paaien | Eieren | Fecunditeit | Larven

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Pastana, M.N.L. and F.C.P., Esguicero, A.L.H. Dagosta, 2017. A new sexually dichromatic miniature Hyphessobrycon (Teleostei: Characiformes: Characidae) from the Rio Formiga, upper Rio Juruena basin, Mato Grosso, Brazil, with a review of sexual dichromatism in Characiformes. J. Fish Biol. 91(5):1-18 [1301-1318]. [Published online 14 Sept. 2017. Volume and pages added later.] (Ref. 128641)

Status op de Rode Lijst van het IUCN (Ref. 130435)

Niet geëvalueerd

CITES (Ref. 128078)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Gevaar voor de mens

Harmless

Gebruik door de mens

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Estimates based on models

Fylogenetische diversiteitsindex (Ref. 82804): PD₅₀ = No PD50 data [Uniqueness, from 0.5 = low to 2.0 = high].

Trofisch niveau (Ref. 69278): 3.0 ±0.23 se; based on food items.

Weerstandsvermogen (Ref. 120179): Hoog, minimale populatieverdubbelingstijd minder dan 15 maanden (Preliminary K or Fecundity.).

Fishing Vulnerability (Ref. 59153): Low vulnerability (10 of 100).

Hyphessobrycon myrmex Pastana, Dagosta & Esguícero, 2017