Hyphessobrycon auca Almirón, Casciotta, Bechara & Ruíz Díaz, 2004

Family:  Characidae (Characins; tetras), subfamily: Stethaprioninae
Max. size:  4.22 cm SL (male/unsexed)
Environment:  benthopelagic; freshwater
Distribution:  South America: Argentina.
Diagnosis:  Distinguished from other species of the genus by having one maxillary tooth with 5 cusps; dental row with teeth decreasing in size anteroposteriorly; males with hooks in all fins; mature females with hooks on pelvic-fin rays; one humeral spot vertically elongated, bounded by a light area; a second lateral spot may be faint or well developed; a wide lateral band ending in a conspicuous caudal spot (Ref. 55796).
Biology: 
IUCN Red List Status: Vulnerable (VU); Date assessed: 01 November 2020 (B1ab(iii)) Ref. (130435)
Threat to humans:  harmless


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