| Family: |
Potamotrygonidae (River stingrays), subfamily: Potamotrygoninae |
| Max. size: |
13.5 cm WD (male/unsexed) |
| Environment: |
benthopelagic; freshwater |
| Distribution: |
South America: Brazil in the upper Rio Amazonas basin according to the material studied, but suspected to enter the lower reaches of most major tributaries and the lower Rio Amazonas basin as well. |
| Diagnosis: |
Can be diagnosed by its unique dorsal color pattern, composed of a uniform gray to light tan or brown color, without strong vermiculations, rosettes or other conspicuous patterns dorsally. This species is tentatively further separated from H. rosai by presenting a slightly more slender tail width at base (holotype tail width 4.5% DW vs. 5.6% DW in holotype of H. rosai), slightly greater preorbital snout length (holotype preorbital snout length 33.2% DW vs. 31.0% DW in holotype of H. rosai), and proportionally smaller pelvic inner length (2.1% DW in holotype of H. gomesi, and ranging from 1.0 to 3.3% DW in all specimens, with a mean of 1.9% DW vs. 4.6% DW in holotype of H. rosai, ranging from 1.3 to 4.9% DW in all specimens, with a mean of 3.7% DW) (Ref. 86515). |
| Biology: |
|
| IUCN Red List Status: |
Not Evaluated (N.E.) Ref. (130435)
|
| Threat to humans: |
harmless |
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