| Main Ref. | Romero, A. and K.M. Paulson, 2001 |
| 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 | eyes absent |
| Type of mouth/snout | |
| Position of mouth | sub-terminal/inferior |
| Type of scales | scales embedded or partly/completely absent |
| Diagnosis |
No externally visible eyes; depigmented (Ref. 44736), scales small with most of them embedded; horn forked on tip; and snout duck-billed (Ref. 86777). |
| Ease of Identification |
| Lateral Lines | Interrupted: No |
| Scales on lateral line | 40 - 46 |
| 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 | |
| Finlets No. | Dorsal |
| Ventral | |
| Spines total | |
| Soft-rays total | 10 - 10 |
| Adipose fin |
| Attributes | forked |
| Fins number | |
| Spines total | |
| Soft-rays total | 8 - 8 |
| Pectoral | Attributes |
| Spines | |
| Soft-rays 15 - 16 | |
| Pelvics | Attributes |
| Position abdominal beneath origin of D1 | |
| Spines | |
| Soft-rays 8 - 8 |