| Main Ref. | Alonso, F., G.E. Terán, P. Calviño, W.S. Serra, M.M. Montes, I.D. García, J.A. Barneche, L. Ciotek, P. Giorgis and J. Casciotta, 2024 |
| Appearance refers to | |
| Bones in OsteoBase |
| Specialized organs | |
| Different appearance | |
| Different colors | |
| Remarks |
| Striking features | |
| Body shape lateral | |
| Cross section | compressed |
| Dorsal head profile | |
| Type of eyes | |
| Type of mouth/snout | |
| Position of mouth | |
| Type of scales | |
| Diagnosis |
This species is distinguished from other congeners by its unique coloration: distinct dark grey to black anterior third portion (about to the 7th or 8th rays) of the dorsal fin in adult males (vs. black portion reduced to first to third anterior dorsal fin rays); absence of iridescent spots on basal half of pectoral fin in adult males (vs. present in Argolebias nigripinnis and Argolebias guarani); anterocentral portion of flanks in females have dark grey spots (vs.none in Argolebias nigripinnis and Argolebias paranaensis) (Ref.132069). Description: D 22-25 in males (17-19 in females); A 21-23 in males (18-20 in females); caudal fin rays 24-26, usually 25; pectoral fin rays (12-13, rarely 12); pelvic fin rays 4-5 (Ref. 132069). |
| 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 | 15 - 16 |
| Barbels | |
| Gill clefts (sharks/rays only) | |
| Gill rakers | |
| on lower limb | 7 - 7 |
| on upper limb | 2 - 2 |
| total | |
| Vertebrae | |
| preanal | |
| total | 28 - 28 |
| Attributes | |
| Fins number | |
| Finlets No. | Dorsal |
| Ventral | |
| Spines total | |
| Soft-rays total | 17 - 24 |
| Adipose fin |
| Attributes |
| Fins number | |
| Spines total | |
| Soft-rays total | 18 - 22 |
| Pectoral | Attributes |
| Spines | |
| Soft-rays 12 - 14 | |
| Pelvics | Attributes |
| Position | |
| Spines | |
| Soft-rays 4 - 5 |