Overview

Distribution

Tocantins River and Tapajós River drainages, Brazil.
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South America: Rio Tocantins and rio Tapajós drainages in Brazil.
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Physical Description

Morphology

Dorsal soft rays (total): 11; Analsoft rays: 33 - 39; Vertebrae: 37 - 39
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Size

Max. size

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

Among the species of Acestrocephalus with dark humeral blotch absent, this species can be separated from Acestrocephalus sardina and Acestrocephalus nigrifasciatus by possessing a smaller eye (28.0- 31.7 vs. 32.6-36.5 in Acestrocephalus nigrifasciatus and 31.3-37.4 in Acestrocephalus sardina); and an oblong dark blotch at caudal base instead of the triangular dark blotch present on the caudal base of those two species. Distinguished from Acestrocephalus pallidus by having an oblong dark blotch at caudal base (vs. absence of dark blotch); and differs further from Acestrocephalus pallidus by the shape of the muscular hiatus of the pseudotympanum and the muscular arrangement around it. Can be diagnosed from Acestrocephalus anomalus by having more teeth in the posterior row on dentary (28-36 vs. 23-28) and fewer teeth in the external tooth row on premaxilla (6-8 vs. 8-11) (Ref. 75890). Description: Dorsal fin ii,9; Anal fin iv,29-35; Pectoral fin i+11-14; 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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