| Main Ref. | Trewavas, E., 1983 |
| Appearance refers to | Male; Female |
| Bones in OsteoBase |
| Specialized organs | genital papilla with tassels (m) |
| Different appearance | different morphology during breeding season only |
| Different colors | different colors during breeding season only |
| Remarks |
| Striking features | none |
| Body shape lateral | short and / or deep |
| Cross section | compressed |
| Dorsal head profile | clearly convex |
| Type of eyes | more or less normal |
| Type of mouth/snout | more or less normal |
| Position of mouth | terminal |
| Diagnosis |
Scales on cheek in 2-3 rows. Caudal scales variable, not on the inter-radial membranes except at the base; never stiffening the fin. Genital papilla large and tuberculate or scalloped, tasseled in breeding males. Generally lighter or darker olive-green. Breeding male iridescent dark green to blue-black on head, body and vertical fins; red edge to dorsal and caudal fins. |
| Ease of Identification |
| Lateral Lines | 2 Interrupted: No |
| Scales on lateral line | 29 - 33 |
| Pored lateral line scales | |
| Scales in lateral series | |
| Scale rows above lateral line | |
| Scale rows below lateral line | |
| Scales around caudal peduncle | |
| Barbels | 0 |
| Gill clefts (sharks/rays only) | absent |
| Gill rakers | |
| on lower limb | 20 - 26 |
| on upper limb | |
| total | |
| Vertebrae | |
| preanal | |
| total | 30 - 32 |
| Attributes | extending over most of the back length |
| Fins number | 1 |
| Finlets No. | Dorsal 0 |
| Ventral 0 | |
| Spines total | 15 - 17 |
| Soft-rays total | 11 - 14 |
| Adipose fin | absent |
| Attributes | more or less truncate; more or less normal |
| Fins number | 1 |
| Spines total | 3 - 3 |
| Soft-rays total | 9 - 12 |
| Pectoral | Attributes more or less normal |
| Spines | |
| Soft-rays | |
| Pelvics | Attributes more or less normal |
| Position thoracic behind origin of D1 | |
| Spines | |
| Soft-rays |