Hypophthalmus marginatus, commonly called the Mapará, is a species of demersal potamodromous catfish of the family Pimelodidae that is native to Amazon and Orinoco River basins of Brazil, Peru and major rivers of French Guiana and Suriname.

[1] It grows to a length of 55.0 cm.

Caudal fin deeply forked with black tips.

[2] A parasite of the esophageal musculature, Kudoa amazonica was found from the fish.

This Pimelodidae-related article is a stub.