Main Ref. | Bertaco, V.A. and V. Garutti, 2007 |
Appearance refers to | |
Bones in OsteoBase |
Specialized organs | |
Different appearance | |
Different colors | |
Remarks | Males have bony hooks on the anal fin and pelvic fin rays. They lack gill gland on first gill arch. Males differ from female in proportional pectoral-fin and pelvic-fin lengths and anal-fin shape, which is concave in females and nearly straight in males. |
Striking features | |
Body shape lateral | fusiform / normal |
Cross section | compressed |
Dorsal head profile | |
Type of eyes | |
Type of mouth/snout | |
Position of mouth | terminal |
Type of scales | cycloid scales |
Diagnosis |
Diagnosed from most members of the genus Astyanax and include it in the A. bimaculatus species group by its horizontally elongate oval, black humeral spot, lozenge shaped caudal-peduncle spot continued into middle caudal-fin rays, and two brown bars in the humeral region. Can be differentiated from species of this group by the following combination of characters: a reticulate scale pattern, a black longitudinal stripe, a toothless maxilla, larger dentary teeth, teeth of the inner row of the premaxilla with five to seven cusps, body depth 33.3-39.9% of SL, predorsal distance 51.7-55.5% of SL, caudal peduncle depth 12.0-13.4% of SL, head length 23.9-26.4% of SL, orbital diameter 28.5- 34.3% of HL, interorbital width 32.7-38.4% of HL, 36-38 perforated scales along the lateral line, and 22-26 branched anal-fin rays, 25-29 total (Ref. 75035). Description: Dorsal fin ii,9; Anal fin iii-iv,22-25; Pectoral fin i11-14; Pelvic fin i7 (Ref. 75035). |
Ease of Identification |
Lateral Lines | Interrupted: No |
Scales on lateral line | |
Pored lateral line scales | |
Scales in lateral series | 36 - 38 |
Scale rows above lateral line | 6 - 7 |
Scale rows below lateral line | 5 - 6 |
Scales around caudal peduncle | 14 - 18 |
Barbels | |
Gill clefts (sharks/rays only) | |
Gill rakers | |
on lower limb | |
on upper limb | |
total | |
Vertebrae | |
preanal | 17 - 17 |
total | 34 - 35 |
Attributes | |
Fins number | 1 |
Finlets No. | Dorsal |
Ventral | |
Spines total | |
Soft-rays total | 11 - 11 |
Adipose fin | present |
Attributes | forked |
Fins number | |
Spines total | |
Soft-rays total |
Pectoral | Attributes |
Spines | |
Soft-rays 12 - 15 | |
Pelvics | Attributes |
Position abdominal before origin of D1 | |
Spines | |
Soft-rays 8 - 8 |