| Family: |
Atherinopsidae (Neotropical silversides), subfamily: Atherinopsinae |
| Max. size: |
20.25 cm SL (male/unsexed) |
| Environment: |
pelagic; freshwater; brackish |
| Distribution: |
South America: interconnected lakes southern to brackish water estuarine area of the rio Tramandai drainage in southern Brazil, from lagoa do Armazem through lagoa do Rincao das Eguas in the south; further in two partially isolated lakes south of the rio Tramandai drainage, namely lagoa do Cipo and lagoa da Solidao. |
| Diagnosis: |
Dorsal spines (total): 4-6; Dorsal soft rays (total): 8-10; Anal spines: 1-1; Anal soft rays: 13-18; Vertebrae: 47-49. Scales in lateral line series above lateral band 48-52; predorsal scales 23-26; conical head shape, with a terminal mouth placed near a horizontal line crossing the center of pupil and the middle of head depth and lacks a pronounced angle at the retroarticular joint (Ref. 47314). Differs from O. bicudo by having smaller snout length, larger eye diameter, larger interorbital width and larger head depth (Ref. 47314). |
| Biology: |
Occurs almost exclusively in freshwater lakes, but also found occasionally in brackish water lagoons (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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