| Main Ref. | Ng, H.H. and M. Kottelat, 2000 |
| Appearance refers to | |
| Bones in OsteoBase |
| Specialized organs | |
| Different appearance | |
| Different colors | |
| Remarks |
| Striking features | |
| Body shape lateral | elongated |
| Cross section | circular |
| Dorsal head profile | more or less straight |
| Type of eyes | other (see remarks) |
| Type of mouth/snout | other (see remarks) |
| Position of mouth | terminal |
| Type of scales | |
| Diagnosis |
Differs from all members of the genus by the unique combination of the following characters: posterior edge of adipose fin rounded; body depth at anus 11.5% SL; head depth 8.3% SL; eyes small, dorsolaterally situated and subcutaneous, diameter 4.8% HL; 41 vertebrae, lower jaw strongly projecting; forked caudal fin. Distinguished from all Indochinese congeners in having a strongly depressed head (depth 8.3% SL vs. 8.8-15.8) with lower jaw strongly- projecting (vs. non- or weakly-projecting); and 20 principal caudal-fin rays (vs. 17). Can be differentiated from A. mucronatum, A. foratum, and A. variegatum in having a smaller eye diameter (4.8% HL vs. 5.1-8.5% HL) (Ref. 37785). |
| 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 | 8 - 8 |
| Vertebrae | |
| preanal | |
| total | 41 - 41 |
| Attributes | |
| Fins number | 1 |
| Finlets No. | Dorsal |
| Ventral | |
| Spines total | 1 - 1 |
| Soft-rays total | 6 - 6 |
| Adipose fin | present |
| Attributes | forked; asymmetric |
| Fins number | |
| Spines total | |
| Soft-rays total | 15 - 15 |
| Pectoral | Attributes more or less normal |
| Spines 1 | |
| Soft-rays 7 - 7 | |
| Pelvics | Attributes more or less normal |
| Position abdominal behind origin of D1 | |
| Spines | |
| Soft-rays 6 - 6 |