| Main Ref. | Costa, W.J.E.M., 2003 |
| Appearance refers to | |
| Bones in OsteoBase |
| Specialized organs | |
| Different appearance | |
| Different colors | |
| Remarks |
| Striking features | |
| Body shape lateral | short and / or deep |
| Cross section | compressed |
| Dorsal head profile | clearly concave |
| Type of eyes | more or less normal |
| Type of mouth/snout | more or less normal |
| Position of mouth | terminal |
| Type of scales | cycloid scales |
| Diagnosis |
Female with anal fin long, spatulated, and long posterior process of occipital, terminating in narrow posterior extension; flanks with iridescent blue bars. Male with entire opercular and dorsolateral regions of head metallic greenish blue; bars on anal and caudal fins; with filamentous rays along the entire distal border of dorsal and anal fins; melanophores concentrated on anterior part of dorsal fin forming a dark gray zone. Dorsal-fin rays 18-20 in male, 15-17 in female; anal-fin rays 20-22 in male, 18-21 in female; caudal-fin rays 24-25, caudal fin subtruncate in male, rounded in female (Ref. 49550). |
| Ease of Identification |
| Lateral Lines | Interrupted: No |
| Scales on lateral line | 26 - 27 |
| Pored lateral line scales | |
| Scales in lateral series | |
| Scale rows above lateral line | |
| Scale rows below lateral line | |
| Scales around caudal peduncle | 12 - 12 |
| Barbels | |
| Gill clefts (sharks/rays only) | |
| Gill rakers | |
| on lower limb | 12 - 12 |
| on upper limb | 3 - 3 |
| total | 15 - 15 |
| Vertebrae | |
| preanal | |
| total | 27 - 28 |
| Attributes | |
| Fins number | 1 |
| Finlets No. | Dorsal |
| Ventral | |
| Spines total | |
| Soft-rays total | 15 - 20 |
| Adipose fin |
| Attributes | other (see remark); more or less normal |
| Fins number | 1 |
| Spines total | |
| Soft-rays total | 18 - 22 |
| Pectoral | Attributes more or less normal |
| Spines 0 | |
| Soft-rays 13 - 14 | |
| Pelvics | Attributes more or less normal |
| Position abdominal before origin of D1 | |
| Spines 0 | |
| Soft-rays 6 - 6 |