| Main Ref. | Masuda, H., K. Amaoka, C. Araga, T. Uyeno and T. Yoshino, 1984 |
| 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 | |
| Diagnosis |
Pectoral fin slightly notched; disk length 13.2 to 20.0% of head length (Ref. 559). Body indigo; fins black; peritoneum black; stomach pale (Ref. 559). |
| Ease of Identification |
| Lateral Lines | 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 | |
| Gill clefts (sharks/rays only) | |
| Gill rakers | |
| on lower limb | |
| on upper limb | |
| total | |
| Vertebrae | |
| preanal | |
| total | 64 - 70 |
| Attributes | |
| Fins number | 1 |
| Finlets No. | Dorsal |
| Ventral | |
| Spines total | 0 - 0 |
| Soft-rays total | 58 - 64 |
| Adipose fin |
| Attributes | forked |
| Fins number | 1 |
| Spines total | 0 - 0 |
| Soft-rays total | 52 - 58 |
| Pectoral | Attributes |
| Spines 0 | |
| Soft-rays 32 - 37 | |
| Pelvics | Attributes part of sucker-disc |
| Position | |
| Spines 0 | |
| Soft-rays 0 - 0 |