Overview

Distribution

Mato Grosso, Brazil.
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South America: Rio Arinos and Rio Juruena, and rio Tapajós basin in Brazil.
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Physical Description

Morphology

Dorsal soft rays (total): 11; Analsoft rays: 31 - 35; Vertebrae: 37 - 38
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Size

Max. size

9.3 cm SL (male/unsexed; (Ref. 75890))
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Diagnostic Description

Both Acestrocephalus nigrifasciatus and Acestrocephalus sardina have the same color pattern and eye size, distinct from all their congeners. In addition, Acestrocephalus nigrifasciatus has more scale rows above (13-14 vs. 10-12) and below (12-13 vs. 10-12) lateral line. Differs from Acestrocephalus sardina by having longer and narrower muscular hiatus of the pseudotympanum than that of Acestrocephalus sardina; and the fibers of the obliquus inferioris muscle are not visible as in the latter species (Ref. 75890).Description: Dorsal fin ii,9; Anal fin iv,27-31; Pectoral fin i+14-15; Pelvic fin i+7 (Ref. 75890).
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Ecology

Habitat

Environment

benthopelagic; freshwater
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Conservation

Threats

Not Evaluated
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