| Main Ref. | Keith, P. and J. Allardi (coords.), 2001 |
| 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 | more or less normal |
| Type of mouth/snout | |
| Position of mouth | |
| Type of scales | |
| Diagnosis |
Elongated body (Ref. 51442). The relative great eyes are placed high and close together (Ref. 51442). Joint pelvic fins forming an oval ventral disc (Ref. 51442). Elongated caudal peduncle (Ref. 51442). Predorsal area and nape covered by scales (Ref. 59043). Scales on the back, in front of the first dorsal fin (Ref. 35388). Dark spot on the hind end of first dorsal fin; Dark area on the front part of pectoral fins indistinct or missing. |
| Ease of Identification |
| Lateral Lines | Interrupted: No |
| Scales on lateral line | 55 - 75 |
| Pored lateral line scales | |
| Scales in lateral series | |
| Scale rows above lateral line | |
| 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 | |
| total | 32 - 34 |
| Attributes | |
| Fins number | 2 |
| Finlets No. | Dorsal |
| Ventral | |
| Spines total | 6 - 8 |
| Soft-rays total | 10 - 12 |
| Adipose fin |
| Attributes | more or less truncate |
| Fins number | 1 |
| Spines total | 1 - 1 |
| Soft-rays total | 9 - 12 |
| Pectoral | Attributes more or less normal |
| Spines 0 | |
| Soft-rays 18 - 21 | |
| Pelvics | Attributes joint, cup-like |
| Position | |
| Spines | |
| Soft-rays |