Acestrocephalus nigrifasciatus

photo by Menezes, N.A.

Family:	Characidae (Characins; tetras), subfamily: Characinae
Max. size:	9.3 cm SL (male/unsexed)
Environment:	benthopelagic; freshwater
Distribution:	South America: Rio Arinos and Rio Juruena, and rio Tapajós basin in Brazil.
Diagnosis:	Dorsal soft rays (total): 11-11; Anal soft rays: 31-35; Vertebrae: 37-38. 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).
Biology:
IUCN Red List Status:	Data deficient (DD); Date assessed: 07 November 2018 Ref. (130435)
Threat to humans:	harmless

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