The Santarém marmoset is a small monkey from a limited area of northern Brazil. Pale ear tufts and alternating black and silvery rings on its tail are distinctive.
Its ear tufts are pale gray, and alternating black and silvery-gray bands run along the tail.
It lives in small groups and eats insects, fruit, and plant exudates such as gum. It has been recorded in lowland primary and secondary forest.
An extinction-risk assessment has not been added yet.