| Main Ref. | Watson, R.E., 1991 |
| Appearance refers to | Male; Female |
| Bones in OsteoBase |
| Specialized organs | |
| Different appearance | different morphology during breeding season only |
| Different colors | different colors during breeding season only |
| Remarks |
| Striking features | |
| Body shape lateral (shape guide) | fusiform / normal |
| Cross section | circular |
| 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 | cycloid scales |
| Diagnosis |
Easily identified by the dark black bar extending downward through the eye and the yellow-brown body color; during courtship, both males and females with 9-11 black bars on their flanks and a red border on the edge of the dorsal fins; black eye bar becomes prominent; males develop a dusky flush to their throats and lower jaw (Ref. 44091). Largest Insularigobius recorded; possesses a relatively high scale count in horizontal series, 47-52, usually 48-50; high predorsal scale count, always fully scaled, 16-23, usually 19-20; belly anteriorly almost always scaled close to pelvic base; breast always with many embedded scales; up to five rows of teeth in upper jaw and up to six in lower jaw (Ref. 34009). |
| Ease of Identification |
| Lateral Lines | Interrupted: No |
| Scales on lateral line | |
| Pored lateral line scales | |
| Scales in lateral series | 47 - 52 |
| 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 | |
| total |
| Attributes | |
| Fins number | 2 |
| Finlets No. | Dorsal |
| Ventral | |
| Spines total | 7 - 7 |
| Soft-rays total | 10 - 11 |
| Adipose fin |
| Attributes |
| Fins number | |
| Spines total | 1 - 1 |
| Soft-rays total | 10 - 11 |
| Pectoral | Attributes |
| Spines | |
| Soft-rays 14 - 16 | |
| Pelvics | Attributes |
| Position thoracic before origin of D1 | |
| Spines | |
| Soft-rays |