| Main Ref. | Paugy, D., 2003 |
| Appearance refers to | Male; Female |
| Bones in OsteoBase |
| Specialized organs | no special organs |
| Different appearance | always different morphology between mature adults |
| Different colors | males alike females |
| Remarks | Pronounced sexual dimorphism affecting the shape of the anal fin. |
| Striking features | none |
| Body shape lateral | fusiform / normal |
| Cross section | oval |
| Dorsal head profile | more or less straight |
| Type of eyes | more or less normal |
| Type of mouth/snout | more or less normal |
| Position of mouth | terminal |
| Type of scales | cycloid scales |
| Diagnosis |
Diagnosis: at least 30 gill rakers on lower limb of first gill arch (30-41); 38-51 lateral line scales, with 7.5-9.5 above and 3.5 below; anal fin with three simple rays and 19-28 branched rays; dorsal-fin origin distinctly behind level of pelvic-fin insertions (Ref. 2759, 81279).
Description: external border of anal fin curves slightly and regularly concave in females; forms an anterior lobe in males with some rays clearly longer; well developed fontanel (Ref. 2759). 41-49 vertebrae (Ref. 2880, 81279).
Colouration: silver/greyish colored with blue-grey back and white belly, greyish fins, entirely covered with scales; Sudanese fishes have orange colors on the inferior lobe of the caudal fin; caudal fork finely edged with black; no precaudal or humeral spots (Ref. 2759, 2880, 81279). |
| Ease of Identification |
| Lateral Lines | 1 Interrupted: No |
| Scales on lateral line | 38 - 51 |
| Pored lateral line scales | |
| Scales in lateral series | |
| Scale rows above lateral line | 7.5 - 9.5 |
| Scale rows below lateral line | 3.5 - 3.5 |
| Scales around caudal peduncle | |
| Barbels | 0 |
| Gill clefts (sharks/rays only) | |
| Gill rakers | |
| on lower limb | 30 - 41 |
| on upper limb | |
| total | |
| Vertebrae | |
| preanal | |
| total | 41 - 49 |
| Attributes | no striking attributes |
| Fins number | 1 |
| Finlets No. | Dorsal |
| Ventral | |
| Spines total | 0 - 0 |
| Soft-rays total | 10 - 10 |
| Adipose fin | present |
| Attributes | forked; more or less normal |
| Fins number | 1 |
| Spines total | 0 - 0 |
| Soft-rays total | 22 - 31 |
| Pectoral | Attributes more or less normal |
| Spines | |
| Soft-rays | |
| Pelvics | Attributes more or less normal |
| Position abdominal before origin of D1 | |
| Spines | |
| Soft-rays |