Heliotrygon gomesi, or Gomes's round ray, is a species of freshwater stingray native to the western Amazon basin in South America, specifically Brazil.

[1] It spends the day in deep river channels, but moves closer to the shore at night to feed.

[3] Heliotrygon gomesi was first discovered in Rio Jamari, Brazil, and described by Marcelo Rodrigues de Carvalho and Nathan R. Lovejoy in 2011.

The genus name, Heliotrygon, is derived from the Greek word 'helios', meaning sun, and refers to the ray's circular body that radiates outward.

Potamotrygonids are unique among living ray families in that they have diversified in the South American freshwater environment.