| Main Ref. | Zarske, A. and J. Géry, 2008 |
| Appearance refers to | |
| Bones in OsteoBase |
| Specialized organs | |
| Different appearance | |
| Different colors | |
| Remarks |
| Striking features | |
| Body shape lateral (shape guide) | short and / or deep |
| Cross section | |
| Dorsal head profile | |
| Type of eyes | |
| Type of mouth/snout | |
| Position of mouth | terminal |
| Type of scales | |
| Diagnosis |
The species is closely related to Metynnis hypsauchen (Müller & Troschel, 1844) according to 1. high number of gill-rakers, 2. long adipose fin, 3. deep body, 4. short head and 5. long occipitale and is clearly defined because of 1. the high number of serrae (36-37 vs. 27-32 of M. hypsauchen), 2. the small scales (91-93 vs. about 75-83), 3. uniformly silver colouration and 4. the extremely elongated dorsal fin and anal fin (Ref. 79633). |
| 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 | |
| Finlets No. | Dorsal |
| Ventral | |
| Spines total | |
| Soft-rays total | |
| Adipose fin | present |
| Attributes |
| Fins number | |
| Spines total | |
| Soft-rays total |
| Pectoral | Attributes |
| Spines | |
| Soft-rays | |
| Pelvics | Attributes |
| Position | |
| Spines | |
| Soft-rays |