| Family: |
Hypopomidae (Bluntnose knifefishes) |
| Max. size: |
15.6 cm TL (male/unsexed); 14.1 cm TL (female) |
| Environment: |
benthopelagic; freshwater |
| Distribution: |
South America: Brazil, Ecuador, Guyana, Peru, Suriname, and Venezuela. Known from the Amazon basin, Orinoco drainage, the Essequibo River, and some coastal drainages of Guyana. |
| Diagnosis: |
Anal soft rays: 165-205. Brachyhypopomus regani is distinguished from other species of the genus Brachyhypopomus by the following combination of characters: presence of accessory electric organ over opercular region (vs. absence in all congeners except B. bombilla and B. menezesi); dorsal surface with large dark blotches against a lighter background (vs. dorsal surface speckled with small brown chromatophores on a pale background in B. bombilla); and caudal filament length 11.1-17.9% of length to end of anal fin (vs. 24.-33.3% in B. menezesi) (Ref. 116763). |
| Biology: |
Occurs only in high-conductivity whitewater floodplains in floating rafts of macrophytes and leaf
litter of newly-inundated forest. Feeds on aquatic insect larvae, microcrustacea, and other small aquatic invertebrates with a predominance of Chironomidae larvae. Spawns in floating macrophytes during the rising and high water period (Ref. 116763). |
| IUCN Red List Status: |
Least Concern (LC); Date assessed: 09 September 2020 Ref. (130435)
|
| Threat to humans: |
harmless |
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