| Family: |
Acestrorhynchidae (Smallscale pike characins), subfamily: Roestinae |
| Max. size: |
18.7 cm SL (male/unsexed) |
| Environment: |
benthopelagic; freshwater |
| Distribution: |
South America: upper and middle Amazon basin and rivers Essequibo, Branco and Negro. |
| Diagnosis: |
Dorsal soft rays (total): 11-11; Anal spines: 4-5; Anal soft rays: 41-43; Vertebrae: 37-40. This species is distinguished from R. molossus by having fewer branched anal-fin rays (41-43, versus 43-47). It differs from R. itupiranga by having more anal-fin rays (41-43, versus 38-41), fewer scale rows between lateral line and anal-fin origin (15-16, versus 18-19) and fewer scale rows around caudal peduncle(27-28, versus 30-31). |
| Biology: |
|
| IUCN Red List Status: |
Least Concern (LC); Date assessed: 03 April 2020 Ref. (130435)
|
| Threat to humans: |
harmless |
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