| Main Ref. | Briggs, J.C., 1960 |
| Appearance refers to | |
| Bones in OsteoBase |
| Specialized organs | |
| Different appearance | |
| Different colors | |
| Remarks |
| Striking features | |
| Body shape lateral | elongated |
| Cross section | |
| Dorsal head profile | |
| Type of eyes | |
| Type of mouth/snout | |
| Position of mouth | |
| Type of scales | |
| Diagnosis |
Poor development of papillae on head; margin of upper lip smooth; dorsal origin much closer to upper pectoral base than to caudal base; anus located much closer to anal fin origin than to rear margin of disc and under 8th dorsal ray; eye 1.2 (1.0-1.4) in bony interorbital space and 5.6 (4.7-7.3) in head; tip of depressed anal fin extends well posterior (about an eye's diameter) to that of the depressed dorsal fin (Ref. 42104). |
| 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 | |
| Barbels | |
| Gill clefts (sharks/rays only) | |
| Gill rakers | |
| on lower limb | |
| on upper limb | |
| total | |
| Vertebrae | |
| preanal | |
| total |
| Attributes | |
| Fins number | 1 |
| Finlets No. | Dorsal 0 - 0 |
| Ventral 0 - 0 | |
| Spines total | 0 - 0 |
| Soft-rays total | 17 - 20 |
| Adipose fin | absent |
| Attributes | other (see remark); more or less normal |
| Fins number | 1 |
| Spines total | 0 - 0 |
| Soft-rays total | 10 - 12 |
| Pectoral | Attributes more or less normal |
| Spines 0 | |
| Soft-rays 21 - 22 | |
| Pelvics | Attributes part of sucker-disc |
| Position | |
| Spines | |
| Soft-rays |