| Family: |
Atherinopsidae (Neotropical silversides), subfamily: Atherinopsinae |
| Max. size: |
26.31 cm SL (male/unsexed) |
| Environment: |
pelagic; freshwater |
| Distribution: |
South America: interconnected lakes of the rio Tramandai drainage, southern Brazil. |
| Diagnosis: |
Dorsal spines (total): 4-6; Dorsal soft rays (total): 7-9; Anal spines: 1-1; Anal soft rays: 16-20; Vertebrae: 47-49. Scales in lateral series above lateral band 47-53; and predorsal scales 24-26 (Ref. 47314). Differs from O. bicudo and O. ledae by the following characters: thin fragile premaxilla, not projected anteriorly in its medialmost portion; ventral head profile usually split into two straight sections, forming an angle at the retroarticular joint; snout short, as long as wide in dorsal view; mouth slightly upturned in lateral view and positioned above a horizontal line crossing near the center of eye and above a horizontal line crossing near the middle of head depth (Ref. 47314). |
| Biology: |
Occurs exclusively in freshwater (Ref. 47314). |
| IUCN Red List Status: |
Near Threatened (NT); Date assessed: 07 November 2018 (B2b(iii,iv,v)) Ref. (130435)
|
| Threat to humans: |
harmless |
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