| Family: |
Acestrorhamphidae (American tetras), subfamily: Acestrorhamphinae |
| Max. size: |
5.03 cm SL (male/unsexed) |
| Environment: |
benthopelagic; freshwater |
| Distribution: |
South America: Argentina. Río Salí basin in northwestern Argentina (Ref. 72407). |
| Diagnosis: |
Astyanax puka is distinguished from the remaining species of the genus by the following combination of characters: shallow body (33.5–39.8% SL), 36–38 perforated scales in lateral line, 6/5 transverse scales, 9–10 gradually decreasing dentary teeth, distally expanded premaxillary teeth, one distally expanded maxillary tooth with 7–9 cusps, short upper-jaw length (34.5–37.8% HL), short maxilla (20.7–23.3% HL)expanded abruptly under maxillary tooth position, short postorbital distance (36.6–46.9% HL), short pelvic to anal-fin origin distance (17.1–20.6% SL), 22–27 branched anal-fin rays, long caudal peduncle (13.3–16.5% SL), bony hooks restricted to pelvic-fin rays 2 to 6 and anterior 6–13 branched anal-fin rays on mature males, and the presence of broad denticles on anterior, lateral, and posterior edges of first ceratobranchial gill rakers (Ref. 72407). |
| Biology: |
|
| IUCN Red List Status: |
Near Threatened (NT); Date assessed: 15 January 2021 (B1ab(iii)) Ref. (130435)
|
| Threat to humans: |
harmless |
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