Overview

Comprehensive Description

Biology

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).
  • 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)
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Distribution

Lower Amazon River, Pará State, Brazil.
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South America: headwaters of the rio Arapiuns, rio Tapajós basin, and from the adjacent headwaters of the igarapé Juruti Grande, rio Amazonas in Brazil.
  • 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)
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Physical Description

Morphology

Dorsal soft rays (total): 11 - 12; Analsoft rays: 21 - 25; Vertebrae: 31
  • 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)
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Size

Max. size

3.0 cm SL (male/unsexed; (Ref. 81198))
  • 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)
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Diagnostic Description

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).Description: Dorsal-fin rays ii, 9, 10, not including small ossification anterior to first unbranched ray, discernible only in c&s specimens, absent in two out of eight c&s individuals; anal-fin rays iv, 17-21; pectoral-fin rays i, 9-11; pelvic-fin rays typically i,7, a single specimen i,8 (Ref. 81198).
  • 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)
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Ecology

Habitat

Environment

benthopelagic; freshwater; depth range 1 - 2 m (Ref. 81198)
  • 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)
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Conservation

Threats

Not Evaluated
  • IUCN 2006 2006 IUCN red list of threatened species. www.iucnredlist.org. Downloaded July 2006.
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