| Main Ref. | Shibukawa, K. and Y. Aonuma, 2007 |
| 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 |
This species differs from its congeners in having the following set of characters: segmented dorsal- and anal-fin rays, 8 and 9, respectively; elongated body, its depth 13.5-15.5% of SL; males with greatly prolonged (extending beyond posterior end of base of second dorsal fin when appressed) and filamentous first dorsal-fin spine; anteroventral and/or distal parts of first dorsal fin may have small black spot(s) (smaller than pupil); small 3-6 black spots on second dorsal fin; dorsal margin of caudal fin with some narrow black markings, in addition to the blackened posterior margin (Ref. 75138). |
| 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 | 12 - 12 |
| Barbels | |
| Gill clefts (sharks/rays only) | |
| Gill rakers | |
| on lower limb | 11 - 15 |
| on upper limb | 2 - 2 |
| total | |
| Vertebrae | |
| preanal | 10 - 10 |
| total | 26 - 26 |
| Attributes | |
| Fins number | 1 |
| Finlets No. | Dorsal |
| Ventral | |
| Spines total | 7 - 7 |
| Soft-rays total | 8 - 8 |
| Adipose fin |
| Attributes |
| Fins number | 1 |
| Spines total | 1 - 1 |
| Soft-rays total | 9 - 9 |
| Pectoral | Attributes |
| Spines 0 | |
| Soft-rays 22 - 26 | |
| Pelvics | Attributes |
| Position | |
| Spines 1 | |
| Soft-rays 5 - 5 |