| Main Ref. | Silva, G.S.C., L. Reia, C.H. Zawadzki and F.F. Roxo, 2019 |
| Appearance refers to | |
| Bones in OsteoBase |
| Specialized organs | |
| Different appearance | |
| Different colors | |
| Remarks | Adult males with papilla covering urogenital opening, long pelvic fin extending beyond anal-fin origin, and membrane along dorsal portion of unbranched pelvic-fin ray (vs. all absent in all analyzed females) (Ref. 119403). |
| Striking features | |
| Body shape lateral | |
| Cross section | angular |
| Dorsal head profile | |
| Type of eyes | |
| Type of mouth/snout | |
| Position of mouth | |
| Type of scales | |
| Diagnosis |
This species is distinguished from its congeners by the following characters: absence of an adipose fin or azygous plates at the typical adipose-fin location (vs. reduced adipose fin or azygous plates in N. botucatu, N. paranensis nd a fully-developed adipose fin in all other species); differs from N. botucatu, N. paranensis by having a dark caudal fin with a unique v-shaped hyaline vertical area (vs. dark caudal fin with several irregular hyaline vertical bands) and having lower lip reaching or almost reaching branquial apertures transversal line (vs. far from reaching branquial apertures transversal line) (Ref. 119403). |
| 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 | 7 - 7 |
| Adipose fin |
| Attributes |
| Fins number | |
| Spines total | |
| Soft-rays total | 5 - 5 |
| Pectoral | Attributes |
| Spines | |
| Soft-rays 6 - 6 | |
| Pelvics | Attributes |
| Position | |
| Spines | |
| Soft-rays 55 |