| Main Ref. | Ng, H.H., 2003 |
| Appearance refers to | |
| Bones in OsteoBase |
| Specialized organs | |
| Different appearance | |
| Different colors | |
| Remarks |
| Striking features | |
| Body shape lateral | elongated |
| Cross section | |
| Dorsal head profile | clearly convex |
| Type of eyes | |
| Type of mouth/snout | |
| Position of mouth | sub-terminal/inferior |
| Type of scales | |
| Diagnosis |
Hypertrophied sensory canal pores on the head and body easily visible to the naked eye; having a long and thin anterior fontanel (except for Clarias batrachus); having prominent serrations on the anterior edge of the pectoral spine (except for Clarias intermedius, Clarias meladerma, Clarias olivaceus and Clarias planiceps); lacking white spots on the body (except for Clarias olivaceus and Clarias planiceps); distance between the tip of the occipital process and the base of the first dorsal fin ray 10.3-12.4% SL; body depth 9.9-11.5% SL; head width 14.0-15.6% SL; snout length 32.5-37.7% SL; interorbital distance 39.4-43.6% SL (Ref. 51071). |
| 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 | 61 - 63 |
| Attributes | |
| Fins number | 1 |
| Finlets No. | Dorsal |
| Ventral | |
| Spines total | 0 - 0 |
| Soft-rays total | 67 - 76 |
| Adipose fin |
| Attributes | more or less truncate |
| Fins number | |
| Spines total | |
| Soft-rays total | 53 - 63 |
| Pectoral | Attributes |
| Spines 1 | |
| Soft-rays 8 - 8 | |
| Pelvics | Attributes |
| Position abdominal behind origin of D1 | |
| Spines 0 | |
| Soft-rays 6 - 6 |