| Main Ref. | Boyd, D.A., P. Nithirojpakdee, G. Deein, C. Vidthayanon, C. Grudpan, W. Tangjitjaroen, J.M. Pfeiffer, Z.S. Randall, T. Srisombat and L.M. Page, 2017 |
| 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 | |
| Type of mouth/snout | |
| Position of mouth | |
| Type of scales | |
| Diagnosis |
Acantopsis ioa is distinguished from all congeners by combination of the following characters: absence of labial barbels; usually lack of distinct small black spot on upper margin of caudal-fin base, 0-1 row of large spots on side of head; absence of large black spots on dorsal or caudal fins; absence of row of black specks beneath midlateral row of black spots; dorsal fin usually with 9½ branched rays and pectoral fin with 10 rays; 15-23 narrow, blotch-like saddles along dorsal midline; 13-21 black spots along side of body, and 46-48 total vertebrae; and body depth 8.5-11.0% SL, body width 5.2-7.9% SL, caudal-peduncle length 13.1-16.2% SL (Ref. 116755). |
| 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 | 33 - 35 |
| total | 46 - 48 |
| Attributes | no striking attributes |
| Fins number | 1 |
| Finlets No. | Dorsal |
| Ventral | |
| Spines total | |
| Soft-rays total | 9 - 10 |
| Adipose fin | absent |
| Attributes | forked |
| Fins number | |
| Spines total | |
| Soft-rays total |
| Pectoral | Attributes more or less normal |
| Spines | |
| Soft-rays 9 - 11 | |
| Pelvics | Attributes more or less normal |
| Position abdominal behind origin of D1 | |
| Spines | |
| Soft-rays |