| Main Ref. | Malabarba, L.R. and B.S. Dyer, 2002 |
| Appearance refers to | |
| Bones in OsteoBase |
| Specialized organs | |
| Different appearance | |
| Different colors | |
| Remarks |
| Striking features | none |
| Body shape lateral | elongated |
| Cross section | |
| Dorsal head profile | |
| Type of eyes | |
| Type of mouth/snout | |
| Position of mouth | terminal |
| Type of scales | cycloid scales |
| Diagnosis |
Scales in lateral line series above lateral band 48-52; predorsal scales 23-26; conical head shape, with a terminal mouth placed near a horizontal line crossing the center of pupil and the middle of head depth and lacks a pronounced angle at the retroarticular joint (Ref. 47314). Differs from O. bicudo by having smaller snout length, larger eye diameter, larger interorbital width and larger head depth (Ref. 47314). |
| Ease of Identification |
| Lateral Lines | Interrupted: No |
| Scales on lateral line | |
| Pored lateral line scales | |
| Scales in lateral series | 48 - 52 |
| Scale rows above lateral line | 6 - 7 |
| Scale rows below lateral line | |
| Scales around caudal peduncle | 15 - 16 |
| Barbels | |
| Gill clefts (sharks/rays only) | |
| Gill rakers | |
| on lower limb | 26 - 28 |
| on upper limb | |
| total | 33 - 35 |
| Vertebrae | |
| preanal | |
| total | 47 - 49 |
| Attributes | |
| Fins number | 2 |
| Finlets No. | Dorsal |
| Ventral | |
| Spines total | 4 - 6 |
| Soft-rays total | 8 - 10 |
| Adipose fin | absent |
| Attributes | forked; more or less normal |
| Fins number | |
| Spines total | 1 - 1 |
| Soft-rays total | 13 - 18 |
| Pectoral | Attributes more or less normal |
| Spines | |
| Soft-rays 12 - 13 | |
| Pelvics | Attributes |
| Position abdominal before origin of D1 | |
| Spines 1 | |
| Soft-rays 5 - 5 |