| Main Ref. | Menezes, N.A. and C.A.S. de Lucena, 1998 |
| Appearance refers to | |
| Bones in OsteoBase |
| Specialized organs | |
| Different appearance | |
| Different colors | |
| Remarks |
| Striking features | |
| Body shape lateral | fusiform / normal |
| Cross section | |
| Dorsal head profile | |
| Type of eyes | |
| Type of mouth/snout | |
| Position of mouth | |
| Type of scales | |
| Diagnosis |
In addition to the autapomorphic presence of a bony ridge on the lateral face of the second branchiostegal ray, this species can be separated from G. alatus in having more lateral line-scales (68-75, versus 58-59), more scale rows between lateral line and anal-fin origin (13-16, versus 9-12) and more scale rows around caudal peduncle(21-23, versus 19). It differs from G. maracaiboensis by its shorter pelvic fin (11.4-13.9% SL, versus 13.6-15.8) and the larger interorbital space (16.6-22.1% SL, versus 21.8-24.5). |
| Ease of Identification | easy to distinguish from other species. |
| Lateral Lines | Interrupted: No |
| Scales on lateral line | |
| Pored lateral line scales | 68 - 75 |
| Scales in lateral series | |
| Scale rows above lateral line | 13 - 16 |
| Scale rows below lateral line | 12 - 14 |
| Scales around caudal peduncle | 21 - 23 |
| Barbels | |
| Gill clefts (sharks/rays only) | |
| Gill rakers | |
| on lower limb | 15 - 18 |
| on upper limb | 7 - 9 |
| total | 22 - 27 |
| Vertebrae | |
| preanal | |
| total | 38 - 38 |
| Attributes | |
| Fins number | |
| Finlets No. | Dorsal |
| Ventral | |
| Spines total | |
| Soft-rays total | 11 - 11 |
| Adipose fin | present |
| Attributes | forked; more or less normal |
| Fins number | |
| Spines total | 4 - 5 |
| Soft-rays total | 43 - 49 |
| Pectoral | Attributes more or less normal |
| Spines | |
| Soft-rays 17 - 18 | |
| Pelvics | Attributes |
| Position | |
| Spines | |
| Soft-rays 8 - 8 |