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Gymnotus onca Albert & Crampton, 2001 |
| Family: | Gymnotidae (Naked-back knifefishes), subfamily: Gymnotinae | |||
| Max. size: | 12 cm TL (male/unsexed) | |||
| Environment: | demersal; freshwater | |||
| Distribution: | South America: upper Amazon River basin, Brazil. | |||
| Diagnosis: | Possess broad irregular dark pigment blotches without alternating light and dark pigments bands and very short head (head length 8.8% TL versus 9-13). | |||
| Biology: | Collected in a whitewater floating meadow of the floodplain in the Tefé region (Ref. 41292). | |||
| IUCN Red List Status: | Least Concern (LC); Date assessed: 07 November 2018 Ref. (130435) | |||
| Threat to humans: | harmless | |||