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Classification / Names Common names | Synonyms | Catalog of Fishes(genus, species) | ITIS | CoL | WoRMS | Cloffa
Teleostei (teleosts) > Characiformes (Characins) > Acestrorhamphidae (American tetras) > Pristellinae
Etymology: Hemigrammus:Greek, hemi = half + Greek, gramma = letter, signal (Ref. 45335); arua:Named for its type locality, lago São Francisco do Alto Aruã, A noun in apposition.
Environment: milieu / climate zone / depth range / distribution range Ecology
Freshwater; benthopelagic; depth range 1 - 2 m (Ref. 81198). Tropical
South America: headwaters of the rio Arapiuns, rio Tapajós basin, and from the adjacent headwaters of the igarapé Juruti Grande, rio Amazonas in Brazil.
Size / Weight / Age
Maturity: Lm? range ? - ? cm Max length : 3.0 cm SL male/unsexed; (Ref. 81198)
Short description Identification keys | Morphology | Morphometrics
Dorsalsoft rays (total): 11 - 12; Analsoft rays: 21 - 25; Vertebrae: 31. Distinguished from all species of the genus, except Hemigrammus stictus (Durbin), by having a large single humeral spot situated from fifth-sixth to posterior margin of eighth-tenth lateral line scales. Differs from Hemigrammus stictus by having a humeral spot roughly rectangular, higher than wide, with a pronounced upper, anteriorly-oriented extension,
conferring an inverted-comma shape to the blotch (vs. humeral spot roughly rounded, not presenting an inverted-comma shape), and life color pattern presenting unpaired fins orange reddish (vs. caudal fin and caudal peduncle bright red in life, remaining fins translucent) (Ref. 81198).
Body shape (shape guide): short and / or deep.
Inhabits shallow marginal areas, with abundant aquatic macrophytes, both emergent and non-emergent (Ref. 81198). Gut contents of four specimens include insect larvae, winged insects and plant matter (Ref. 81198).
Life cycle and mating behavior Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Lima, F.C.T., W.B. Wosiacki and C.S. Ramos, 2009. Hemigrammus arua, a new species of characid (Characiformes: Characidae) from the lower Amazon, Brazil. Neotrop. Ichthyol. 7(2):153-160. (Ref. 81198)
IUCN Red List Status (Ref. 130435: Version 2025-2)
