Classification / Names
Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa
Actinopterygii (ray-finned fishes) > Characiformes
(Characins) > Characidae
(Characins) > Incertae sedis
Etymology: Astyanax: The name of Astyanax, Hector´s son in the Greek mithology (Ref. 45335); utiariti: Specific name utiariti, is in reference to Salto Utiariti, an indigenous word that means in the Pareci nation's laguage "place of clever people' (utia =clever; halíti =people). Pareci tribe is in the upper rio Tapajós drainage, at type locality.
Environment / Climate / Range
Freshwater; benthopelagic. Tropical
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 7.9 cm SL male/unsexed; (Ref. 75035)
Morphology | Morphometrics
Vertebrae: 34 - 35. Diagnosed from most members of the genus Astyanax and include it in the A. bimaculatus species group by its horizontally elongate oval, black humeral spot, lozenge shaped caudal-peduncle spot continued into middle caudal-fin rays, and two brown bars in the humeral region. Can be differentiated from species of this group by the following combination of characters: a reticulate scale pattern, a black longitudinal stripe, a toothless maxilla, larger dentary teeth, teeth of the inner row of the premaxilla with five to seven cusps, body depth 33.3-39.9% of SL, predorsal distance 51.7-55.5% of SL, caudal peduncle depth 12.0-13.4% of SL, head length 23.9-26.4% of SL, orbital diameter 28.5- 34.3% of HL, interorbital width 32.7-38.4% of HL, 36-38 perforated scales along the lateral line, and 22-26 branched anal-fin rays, 25-29 total (Ref. 75035).
Countries | FAO areas | Ecosystems | Occurrences | Introductions | Faunafri
South America: known only from rio Papagaio of the upper rio Tapajós drainage in Brazil.
Found in a large river which has several waterfalls, with crystalline water, segments with rapids, a well developed riparian vegetation and a substrate of stones, rocks and sand (Ref. 75035). Occurs along the left bank of the river in semilentic stretches (Ref. 75035).
Bertaco, V.A. and V. Garutti, 2007. New Astyanax from the upper Rio Tapajós drainage, Central Brazil (Characiformes: Characidae). Neotrop. Ichthyol. 5(1):25-30.
IUCN Red List Status (Ref. 90363)
Threat to humans
CountriesFAO areasEcosystemsOccurrencesIntroductionsStocksEcologyDietFood itemsFood consumptionRation
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningFecundityEggsEgg development
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
CollaboratorsPicturesStamps, CoinsSoundsCiguateraSpeedSwim. typeGill areaOtolithsBrainsVision
Estimates of some properties based on empirical models
Phylogenetic diversity index (Ref. 82805
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01350 (0.00586 - 0.03111), b=3.03 (2.83 - 3.23), based on LWR estimates for this Subfamily-BS (Ref. 93245
Trophic Level (Ref. 69278
): 2.8 ±0.3 se; Based on size and trophs of closest relatives
Resilience (Ref. 69278
Vulnerability (Ref. 59153
): Low vulnerability (10 of 100) .