| Main Ref. | Parin, N.V. and O.D. Borodulina, 1990 |
| Appearance refers to | |
| Bones in OsteoBase |
| Specialized organs | |
| Different appearance | |
| Different colors | |
| Remarks |
| Striking features | |
| Body shape lateral | |
| Cross section | |
| Dorsal head profile | |
| Type of eyes | |
| Type of mouth/snout | |
| Position of mouth | |
| Type of scales | |
| Diagnosis |
Differs from all species of Polymetme in having more fusiform and elongated body and a smaller head; pyloric caeca 7; photophores above anal fin 16-18 (Ref. 41740). |
| 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 | 18 - 19 |
| Vertebrae | |
| preanal | |
| total | 43 - 45 |
| Attributes | |
| Fins number | 1 |
| Finlets No. | Dorsal |
| Ventral | |
| Spines total | 0 - 0 |
| Soft-rays total | 11 - 13 |
| Adipose fin | present |
| Attributes | forked; more or less normal |
| Fins number | |
| Spines total | 0 - 0 |
| Soft-rays total | 28 - 33 |
| Pectoral | Attributes |
| Spines | |
| Soft-rays 9 - 11 | |
| Pelvics | Attributes |
| Position abdominal before origin of D1 | |
| Spines | |
| Soft-rays |