| Main Ref. | Allen, G.R., 1991 |
| Appearance refers to | |
| Bones in OsteoBase |
| Specialized organs | |
| Different appearance | always different morphology between mature adults |
| Different colors | |
| Remarks | This species exhibits a marked sexual dichromatism: juveniles and females usually have a small black spot at the rear base of the dorsal fin and (at least in Micronesia) lack yellow; males have a bright yellow snout and tail and sometimes, latter all orange in some regions; also lack the black spot (Ref. 7247). |
| Striking features | none |
| Body shape lateral | fusiform / normal |
| Cross section | oval |
| Dorsal head profile | clearly convex |
| Type of eyes | more or less normal |
| Type of mouth/snout | more or less normal |
| Position of mouth | terminal |
| Type of scales | ctenoid scales |
| Diagnosis |
Description: Recognized by the brilliant light-blue color (Ref. 48636). This species exhibits a marked sexual dichromatism: juveniles and females usually have a small black spot at the rear base of the dorsal fin and (at least in Micronesia) lack yellow; males have a bright yellow snout and tail and sometimes, latter all orange in some regions; also lack the black spot (Ref. 7247). Body depth 2.2-2.4 in SL (Ref. 90102). |
| Ease of Identification |
| Lateral Lines | 1 Interrupted: No |
| Scales on lateral line | 16 - 17 |
| Pored lateral line scales | 16 - 17 |
| Scales in lateral series | |
| Scale rows above lateral line | |
| Scale rows below lateral line | |
| Scales around caudal peduncle | |
| Barbels | 0 |
| Gill clefts (sharks/rays only) | |
| Gill rakers | |
| on lower limb | |
| on upper limb | |
| total | 17 - 19 |
| Vertebrae | |
| preanal | |
| total |
| Attributes | no striking attributes |
| Fins number | 1 |
| Finlets No. | Dorsal 0 - 0 |
| Ventral 0 - 0 | |
| Spines total | 13 - 13 |
| Soft-rays total | 12 - 13 |
| Adipose fin | absent |
| Attributes | forked; more or less normal |
| Fins number | 1 |
| Spines total | 2 - 2 |
| Soft-rays total | 13 - 14 |
| Pectoral | Attributes more or less normal |
| Spines 0 | |
| Soft-rays 15 - 17 | |
| Pelvics | Attributes more or less normal |
| Position thoracic beneath origin of D1 | |
| Spines 0 | |
| Soft-rays 16 - 17 |