| Family: |
Characidae (Characins; tetras), subfamily: Stethaprioninae |
| Max. size: |
8.58 cm SL (male/unsexed) |
| Environment: |
demersal; freshwater; depth range - 0 m |
| Distribution: |
South America: upper Uruguay River basin in Misiones, Argentina. |
| Diagnosis: |
Dorsal spines (total): 0-0; Dorsal soft rays (total): 12-12; Anal spines: 0-0; Anal soft rays: 21-27. Distinguished from all Astyanax congeners by the possession of a shallow body (body depth 34.9-39.4% SL); 3-4 maxillary teeth; the insertion of the fifth tooth of the inner premaxillary series posterior to main series; presence of two humeral spots, second humeral spot distinctly vertically elongated and sometimes wider than the first; the presence of 34-36 perforated scales in the lateral series, and iv-v, 20-22 anal fin rays (Ref. 46822). Olive green, iridescent gold in color; red pigmentation on last 4 or 5 procurrent rays, unbranched principal rays and on 3 branched principal rays in each caudal fin lobe, except on distal portion of those rays; yellowish area bounding this red caudal portion; adipose fin and base of anal fins yellowish (Ref. 46822). |
| Biology: |
Inhabits streams with depths ranging from less than 1 m to over 2 m (Ref. 46822). |
| IUCN Red List Status: |
Least Concern (LC); Date assessed: 27 August 2020 Ref. (130435)
|
| Threat to humans: |
harmless |
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