| Main Ref. | Lee, C.-L. and H. Asano, 1997 |
| Appearance refers to | |
| Bones in OsteoBase |
| Specialized organs | |
| Different appearance | |
| Different colors | |
| Remarks |
| Striking features | |
| Body shape lateral | eel-like |
| Cross section | circular |
| Dorsal head profile | more or less straight |
| Type of eyes | other (see remarks) |
| Type of mouth/snout | more or less normal |
| Position of mouth | sub-terminal/inferior |
| Type of scales | |
| Diagnosis |
Head and trunk short, about 1.6-1.7 times in tail. Eyes small and covered with semitransparent membrane. Dorsal fin originates much behind the pectoral tip; dorsal and anal fins very low without any spots. Preoperculomandibular pores 5 + 2. Vertebrae 178-184 (Ref. 40862). Differs to O. aphotistos in having more vertebrae, 178-184 and 2 distinct papillae on the upper lip which is absent in aphotistos (Ref. 40865). |
| 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 | 178 - 184 |
| Attributes | |
| Fins number | |
| Finlets No. | Dorsal |
| Ventral | |
| Spines total | |
| Soft-rays total | |
| Adipose fin |
| Attributes | pointed |
| Fins number | |
| Spines total | |
| Soft-rays total |
| Pectoral | Attributes |
| Spines | |
| Soft-rays | |
| Pelvics | Attributes |
| Position | |
| Spines | |
| Soft-rays |