| 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. Specimens over 10.0 cm SL are recognized by the elongate head, small eyes, narrow interorbital, long snout and thick pointed premaxilla. Easily distinguished from O. piquava and O. mirinensis by several head shape characters. Ventral head profile nearly straight, sometimes with a slight convexity at the retroarticular joint; eyes clearly smaller than snout length; reticulate pigmented pattern in the border of check scales and body scales above and below lateral band (Ref. 47314). |
| Ease of Identification |
| Lateral Lines | Interrupted: No |
| Scales on lateral line | 48 - 52 |
| Pored lateral line scales | |
| Scales in lateral series | |
| Scale rows above lateral line | 6 - 7 |
| Scale rows below lateral line | |
| Scales around caudal peduncle | 14 - 16 |
| Barbels | |
| Gill clefts (sharks/rays only) | |
| Gill rakers | |
| on lower limb | 26 - 30 |
| on upper limb | |
| total | 32 - 37 |
| Vertebrae | |
| preanal | |
| total | 47 - 49 |
| Attributes | |
| Fins number | 2 |
| Finlets No. | Dorsal |
| Ventral | |
| Spines total | 4 - 7 |
| Soft-rays total | 8 - 10 |
| Adipose fin | absent |
| Attributes | forked; more or less normal |
| Fins number | |
| Spines total | 1 - 1 |
| Soft-rays total | 15 - 18 |
| Pectoral | Attributes |
| Spines | |
| Soft-rays 12 - 14 | |
| Pelvics | Attributes |
| Position abdominal before origin of D1 | |
| Spines 1 | |
| Soft-rays 5 - 5 |