| Main Ref. | Nelson, J.S., 1984 |
| Appearance refers to | |
| Bones in OsteoBase |
| Specialized organs | |
| Different appearance | |
| Different colors | |
| Remarks |
| Striking features | striking fins |
| Body shape lateral | short and / or deep |
| Cross section | compressed |
| Dorsal head profile | |
| Type of eyes | more or less normal |
| Type of mouth/snout | more or less normal |
| Position of mouth | sub-terminal/inferior |
| Type of scales | |
| Diagnosis |
Body deep and compressed, quadrangular in outline. Mouth small and inferior. Second dorsal spine, fourth pectoral ray, and first pelvic ray greatly prolonged into free filaments which reach tail base or beyond. First dorsal-fin spine, fourth pectoral-fin ray, and first pelvic-fin ray greatly elongated filaments, reaching to or beyond vertical line at rear end of dorsal-and anal-fin bases. Head naked. Mouth inferior, the snout and upper jaw projecting in front of lower jaw (Ref 43039). |
| Ease of Identification |
| Lateral Lines | 1 Interrupted: No |
| Scales on lateral line | 46 - 50 |
| Pored lateral line scales | |
| 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 | |
| Vertebrae | |
| preanal | |
| total |
| Attributes | other |
| Fins number | 1 |
| Finlets No. | Dorsal 0 - 0 |
| Ventral 0 - 0 | |
| Spines total | 8 - 8 |
| Soft-rays total | 19 - 20 |
| Adipose fin | absent |
| Attributes | forked; more or less normal |
| Fins number | 1 |
| Spines total | 3 - 3 |
| Soft-rays total | 16 - 17 |
| Pectoral | Attributes more or less normal |
| Spines | |
| Soft-rays 19 - 20 | |
| Pelvics | Attributes |
| Position | |
| Spines 1 | |
| Soft-rays 5 - 5 |