| Main Ref. | Costa, W.J.E.M., 2007 |
| 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 | cycloid scales |
| Diagnosis |
Differs from all other species of the subgenus Melanorivulus by the possession of the following combination of characters: flank with red marks arranged in chevron-like pattern with vertex on the ventral part of the flank; pelvic fin usually with 6 rays, or sometimes 7 when including a rudimentary ray; scales in the longitudinal series 31-33; dorsal portion of the caudal fin in females with a horizontal series of white spots; pectoral fin with 13 rays; caudal fin with 28-31 rays; and flank in both sexes with conspicuous red bars (Ref. 76937). Description: longitudinal series of scales 31-33; transverse series of scales 8. Caudal fin elliptical (Ref. 76937). |
| 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 | 8 - 8 |
| Barbels | |
| Gill clefts (sharks/rays only) | |
| Gill rakers | |
| on lower limb | |
| on upper limb | |
| total | 8 - 8 |
| Vertebrae | |
| preanal | |
| total | 30 - 31 |
| Attributes | |
| Fins number | 1 |
| Finlets No. | Dorsal |
| Ventral | |
| Spines total | |
| Soft-rays total | 8 - 10 |
| Adipose fin | absent |
| Attributes | more or less truncate |
| Fins number | |
| Spines total | |
| Soft-rays total | 12 - 14 |
| Pectoral | Attributes |
| Spines | |
| Soft-rays 13 - 13 | |
| Pelvics | Attributes |
| Position abdominal before origin of D1 | |
| Spines | |
| Soft-rays 6 - 7 |