| Main Ref. | Trewavas, E., 1983 |
| Appearance refers to | Male; Female |
| Bones in OsteoBase |
| Specialized organs | no special organs |
| Different appearance | |
| Different colors | |
| Remarks |
| Striking features | |
| Body shape lateral | short and / or deep |
| Cross section | |
| Dorsal head profile | |
| Type of eyes | more or less normal |
| Type of mouth/snout | more or less normal |
| Position of mouth | |
| Type of scales | cycloid scales |
| Diagnosis |
Body depth not more than 38.5 % SL; interorbital region narrower and the lower jaw longer than in O. macrochir. Length of pharyngeal bone 35.8% head length in a fish of SL 59 mm. 8-10 dark vertical bars on upper flank; 3 mid-lateral blotches and, in some, 1 at the end of the caudal peduncle. Outer edge of pelvic fin dark. Scales on cheek in 2 rows. |
| Ease of Identification |
| Lateral Lines | 2 Interrupted: No |
| Scales on lateral line | 29 - 32 |
| Pored lateral line scales | |
| Scales in lateral series | |
| Scale rows above lateral line | 4.5 - 5.5 |
| Scale rows below lateral line | |
| Scales around caudal peduncle | |
| Barbels | 0 |
| Gill clefts (sharks/rays only) | absent |
| Gill rakers | |
| on lower limb | 15 - 18 |
| on upper limb | |
| total | |
| Vertebrae | |
| preanal | |
| total | 30 |
| Attributes | extending over most of the back length |
| Fins number | 1 |
| Finlets No. | Dorsal 0 |
| Ventral 0 | |
| Spines total | 15 - 17 |
| Soft-rays total | 11 - 13 |
| Adipose fin | absent |
| Attributes | more or less truncate; more or less normal |
| Fins number | 1 |
| Spines total | 3 - 3 |
| Soft-rays total | 8 - 9 |
| Pectoral | Attributes more or less normal |
| Spines | |
| Soft-rays | |
| Pelvics | Attributes more or less normal |
| Position thoracic | |
| Spines | |
| Soft-rays |