| 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 | none |
| Body shape lateral | fusiform / normal |
| 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 |
Body elongate, higher and more bluish than N. lopezi. Forehead without rostral prominence even in adults. Two small peduncular plates each with a sharp, approximately semicircular, laterally projecting keel. caudal fin emarginate without a filament. Reaches 46 cm SL. |
| 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 |
| Attributes | extending over most of the back length |
| Fins number | 1 |
| Finlets No. | Dorsal 0 - 0 |
| Ventral 0 - 0 | |
| Spines total | 6 - 7 |
| Soft-rays total | 26 - 28 |
| Adipose fin | absent |
| Attributes | more or less truncate |
| Fins number | 1 |
| Spines total | 2 - 2 |
| Soft-rays total | 26 - 28 |
| Pectoral | Attributes more or less normal |
| Spines 0 | |
| Soft-rays 16 - 18 | |
| Pelvics | Attributes more or less normal |
| Position abdominal behind origin of D1 | |
| Spines 1 | |
| Soft-rays 3 - 3 |