It is characterized by a rhomboid pectoral fin disk, elongated snout, and a dark band on the lower lip.

Colares stingrays are both targeted and caught as bycatch by Brazilian artisanal and commercial fisheries; these pressures coupled with its small range and slow reproductive rate has led the International Union for Conservation of Nature (IUCN) to list this species as critically endangered.

The Colares stingray was described by Hugo Santos, Ulisses Gomes, and Patricia Charvet-Almeida in 2004, in the scientific journal Zootaxa.

The specific epithet refers to Colares Island in Marajó Bay, where the type specimen, a 2.07 m (6.8 ft) long mature male, was caught.

[2][4] Small, flattened tubercles are randomly arranged along the dorsal midline from the base of the tail to between the eyes, thinning out towards the tip of the snout.

[1] The International Union for Conservation of Nature (IUCN) has assessed the Colares stingray as critically endangered, citing its limited geographic distribution, likely slow reproductive rate, and susceptibility to fishing gear.