| Main Ref. | Ng, H.H., 2004 |
| Appearance refers to | |
| Bones in OsteoBase |
| Specialized organs | |
| Different appearance | |
| Different colors | |
| Remarks |
| Striking features | |
| Body shape lateral | elongated |
| Cross section | |
| Dorsal head profile | |
| Type of eyes | |
| Type of mouth/snout | |
| Position of mouth | sub-terminal/inferior |
| Type of scales | |
| Diagnosis |
Distinguished from Southeast Asian congeners, except Clarias batrachus and C. insolitus in having a narrow frontal fontanel. Differs from C. batrachus in possessing more anal-fin rays (56-64 vs. 47-58) and a broader snout and from C. insolitus in having a wider head (17.4-18.3% SL vs. 14.0-15.6) and a smaller distance between the occipital process and the dorsal fin (7.2-7.5% SL vs. 10.3-12.4) (Ref. 55369). |
| 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 | 14 - 14 |
| Vertebrae | |
| preanal | |
| total | 62 - 64 |
| Attributes | extending over most of the back length |
| Fins number | 1 |
| Finlets No. | Dorsal |
| Ventral | |
| Spines total | 0 - 0 |
| Soft-rays total | 72 - 80 |
| Adipose fin | absent |
| Attributes | more or less truncate |
| Fins number | |
| Spines total | |
| Soft-rays total | 56 - 64 |
| Pectoral | Attributes |
| Spines 1 | |
| Soft-rays 8 - 8 | |
| Pelvics | Attributes |
| Position abdominal behind origin of D1 | |
| Spines | |
| Soft-rays 6 - 6 |