| Family: |
Gymnotidae (Naked-back knifefishes), subfamily: Gymnotinae |
| Max. size: |
55 cm TL (male/unsexed); max.weight: 450.0 g |
| Environment: |
demersal; freshwater; pH range: 6.30000019073486 - 7.19999980926514 |
| Distribution: |
South America: Mamirauá lake system, Lago Tefé, and terra firme swamps near the town of Tefé in Central Amazonia. |
| Diagnosis: |
Possess reverse counter shading (lighter on top) in which the dark bands are interrupted dorsally and the pale interband regions merge on the dorsum and in which the dorsum has a silver-blue sheen in life, and very large anterior nares (diameter about that of eye), associated with a large cleft in the anterolateral margin of the ethmoid region resulting in a square anterior margin of snout between the anterior nares. With deep body (body depth 11-13% TL versus 6-10): long head (head length 12.7-13.6% TL versus 8.8-12.6), and depressed head (head depth 53-57% TL versus 58-64) (Ref. 41292). |
| Biology: |
Juveniles commonly collected in várzea floating meadows, adults in várzea flooded forest but rarely caught in floating meadows where they are presumed to spawn. |
| IUCN Red List Status: |
Least Concern (LC); Date assessed: 12 August 2020 Ref. (130435)
|
| Threat to humans: |
harmless |
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