This agouti occurs in the lowlands of eastern Amazonian Brazil. Its bright orange hindquarters stand out, and it uses lowland rainforest and forest edges. Published information on its wild behavior and diet is lacking.
The forequarters are grayish, while the rump and flanks are bright pale orange. A clear streak runs along the middle of the back, and the orange flank hairs have few dark bands.
It inhabits lowland rainforest, including second growth and forest edges. On Marajó Island it was recorded in coastal vegetation mixed with forest, shrubs, and planted trees.
An extinction-risk assessment has not been added yet.