| Family: |
Rivulidae (Rivulines), subfamily: Rivulinae |
| Max. size: |
3.23 cm SL (male/unsexed); 3.72 cm SL (female) |
| Environment: |
pelagic; freshwater; pH range: 5.2 - 5.9 |
| Distribution: |
South America: Araguari river drainage, upper rio Paraná basin in Brazil. |
| Diagnosis: |
Rivulus giarettai differs from all other species of the subgenus Melanorivulus by possessing a unique color pattern on flank in males, in which red pigmentation is arranged to form a vermiculate pattern. It is similar to species endemic to the central Brazilian
plateau in having ventral process of angulo-articular vestigial, first epibranchial curved, and flank intense greenish blue or greenish golden, to purplish blue above anal-fin base in males; it differs from central Brazilian plateau species by a combination of reduction of black pigmentation on head and humeral region in males, 34-36 scales on the longitudinal series, 30-32 caudal-fin rays, 3-4 vomerine teeth, and caudal fin with bars in both sexes. |
| Biology: |
Occurs at the surface, close to amphibious vegetation at stream bank, with clear to slightly turbid water (Ref. 75625). |
| IUCN Red List Status: |
Least Concern (LC); Date assessed: 07 November 2018 Ref. (130435)
|
| Threat to humans: |
harmless |
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