Overview

Comprehensive Description

Biology

Collected from a black-water, terra-firme forest stream about 4-5 m wide and 0.5-1.0 m deep, with a predominantly sandy bottom. Also found in a large oxbow lake (Ref. 81201).
  • Marinho, M.M.F. and F.C.T. Lima 2009 Astyanax ajuricaba: a new species from the Amazon basin in Brazil (Characiformes: Characidae). Neotrop. Ichthyol. 7(2):169-174. (Ref. 81201)
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Distribution

Upper rio Negro basin, Brazil.
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South America: rio Negro, rio Solimões, and rio Tapajós basins, Amazon basin in Brazil.
  • Marinho, M.M.F. and F.C.T. Lima 2009 Astyanax ajuricaba: a new species from the Amazon basin in Brazil (Characiformes: Characidae). Neotrop. Ichthyol. 7(2):169-174. (Ref. 81201)
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Physical Description

Morphology

Dorsal soft rays (total): 11; Analsoft rays: 27 - 31; Vertebrae: 36 - 37
  • Marinho, M.M.F. and F.C.T. Lima 2009 Astyanax ajuricaba: a new species from the Amazon basin in Brazil (Characiformes: Characidae). Neotrop. Ichthyol. 7(2):169-174. (Ref. 81201)
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Size

Max. size

9.5 cm SL (male/unsexed; (Ref. 81201))
  • Marinho, M.M.F. and F.C.T. Lima 2009 Astyanax ajuricaba: a new species from the Amazon basin in Brazil (Characiformes: Characidae). Neotrop. Ichthyol. 7(2):169-174. (Ref. 81201)
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Diagnostic Description

Distinguished from all species of the genus and from all remaining characids by having a unique color pattern consisting of the combination of presence of a conspicuous, narrow dark midlateral stripe, a single elongated humeral spot, and upper caudal-fin lobe and middlecaudal-fin rays dark, with a clear, rounded ocellated spot present dorsally at anterior third of caudal-fin lobe (Ref. 81201).Description: Dorsal-fin rays ii,9, not including small ossification anterior to first unbranched ray, discernible only in cleared and stained specimens; anal-fin rays iv or v, 23-27; pectoral-fin rays i,13-15; pelvic-fin rays i,7 (Ref. 81201).
  • Marinho, M.M.F. and F.C.T. Lima 2009 Astyanax ajuricaba: a new species from the Amazon basin in Brazil (Characiformes: Characidae). Neotrop. Ichthyol. 7(2):169-174. (Ref. 81201)
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Ecology

Habitat

Environment

benthopelagic; freshwater
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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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