| Main Ref. | Crampton, W.G.R., C.D. de Santana, J.C. Waddell and N.R. Lovejoy, 2017 |
| Appearance refers to | |
| Bones in OsteoBase |
| Specialized organs | |
| Different appearance | |
| Different colors | |
| Remarks |
| Striking features | |
| Body shape lateral | elongated |
| Cross section | |
| Dorsal head profile | |
| Type of eyes | |
| Type of mouth/snout | |
| Position of mouth | |
| Type of scales | |
| Diagnosis |
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). |
| Ease of Identification |
| Lateral Lines | Interrupted: No |
| Scales on lateral line | |
| Pored lateral line scales | |
| Scales in lateral series | |
| Scale rows above lateral line | 5 - 7 |
| Scale rows below lateral line | |
| Scales around caudal peduncle | |
| Barbels | |
| Gill clefts (sharks/rays only) | |
| Gill rakers | |
| on lower limb | |
| on upper limb | |
| total | |
| Vertebrae | |
| preanal | 16 - 18 |
| total |
| Attributes | |
| Fins number | |
| Finlets No. | Dorsal |
| Ventral | |
| Spines total | |
| Soft-rays total | |
| Adipose fin | absent |
| Attributes | pointed |
| Fins number | |
| Spines total | |
| Soft-rays total | 165 - 205 |
| Pectoral | Attributes |
| Spines | |
| Soft-rays 14 - 16 | |
| Pelvics | Attributes |
| Position | |
| Spines | |
| Soft-rays |