| Main Ref. | Nakamura, I. and N.V. Parin, 1993 |
| Appearance refers to | |
| Bones in OsteoBase |
| Specialized organs | |
| Different appearance | |
| Different colors | |
| Remarks |
| Striking features | none |
| Body shape lateral | elongated |
| Cross section | compressed |
| Dorsal head profile | clearly convex |
| Type of eyes | more or less normal |
| Type of mouth/snout | more or less normal |
| Position of mouth | terminal |
| Type of scales | |
| Diagnosis |
Pectoral fin is represented by a single spine in small specimens or entirely absent in individuals over 25 cm SL. Lateral line branching below the 5th to 6th spine of the first dorsal fin. The upper line reaches to the base of the first dorsal finlet, the lower line runs sub laterally. Most of the body is naked except for a large rectangular stripe of squamation extending forward from the caudal peduncle. Overall color is grayish brown; a black blotch is on membranes between the first and third dorsal-fin spine. |
| Ease of Identification |
| Lateral Lines | 2 Interrupted: No |
| Scales on lateral line | |
| Pored lateral line scales | |
| Scales in lateral series | |
| Scale rows above lateral line | |
| Scale rows below lateral line | |
| Scales around caudal peduncle | |
| Barbels | 0 |
| Gill clefts (sharks/rays only) | |
| Gill rakers | |
| on lower limb | |
| on upper limb | |
| total | |
| Vertebrae | |
| preanal | |
| total | 34 - 34 |
| Attributes | extending over most of the back length |
| Fins number | 2 |
| Finlets No. | Dorsal 2 - 2 |
| Ventral 2 - 2 | |
| Spines total | 19 - 20 |
| Soft-rays total | 15 - 18 |
| Adipose fin | absent |
| Attributes | forked; more or less normal |
| Fins number | 1 |
| Spines total | 2 - 2 |
| Soft-rays total | 12 - 13 |
| Pectoral | Attributes more or less normal |
| Spines 0 | |
| Soft-rays 12 - 13 | |
| Pelvics | Attributes other (see diagnosis) |
| Position | |
| Spines 1 | |
| Soft-rays 0 - 0 |