| Main Ref. | Babu, K.K.S., 2012 |
| Appearance refers to | |
| Bones in OsteoBase |
| Specialized organs | |
| Different appearance | |
| Different colors | |
| Remarks |
| Striking features | |
| Body shape lateral (shape guide) | elongated |
| Cross section | |
| Dorsal head profile | |
| Type of eyes | eyes absent |
| Type of mouth/snout | |
| Position of mouth | |
| Type of scales | |
| Diagnosis |
Distinguished by having the following combination of characters: body narrow, elongated, sub-cylindrical, small sized; dorsal fin soft with 21 unbranched rays; anal fin soft with 15 unbranched rays; caudal fin is not confluent with dorsal and anal fins, round in shape and with 28 fin rays (including the procumbent rays); pectoral fin round, highly vestigial and not visible with naked eyes; and a pair of pseudo-tympanic membranes on both lateral sides of the head base, near to the pectoral fin (Ref. 92945) |
| 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 | 8 |
| Gill clefts (sharks/rays only) | |
| Gill rakers | |
| on lower limb | |
| on upper limb | |
| total | |
| Vertebrae | |
| preanal | |
| total |
| Attributes | no striking attributes |
| Fins number | |
| Finlets No. | Dorsal |
| Ventral | |
| Spines total | |
| Soft-rays total | 21 - 21 |
| Adipose fin |
| Attributes |
| Fins number | |
| Spines total | |
| Soft-rays total | 15 - 15 |
| Pectoral | Attributes |
| Spines | |
| Soft-rays 9 - 9 | |
| Pelvics | Attributes |
| Position behind origin of D1 | |
| Spines | |
| Soft-rays 6 - 6 |