The Rio Acari marmoset[1] (Mico acariensis) is endemic to Brazil. It was first described in the year 2000.
- The Rio Acari marmoset is snow white on the upper body, fading distally from gray to dark gray mixed with orange on the back and with an orange stripe running down each knee.
- The dorsal sides of the arms and hands are gray mixed with orange, the ventral sides of the forearms are white with orange, and the ventral sides of the legs are white, fading distally to orange with bright orange inner surfaces.
- The neck and chest are white, the belly is bright orange, and the tail is black with a bright orange tip.
- The face is bare and pink or flesh-colored, with black spots between the eyes, on the sides of the nostrils, and on the lower lip and chin.
- The nose has a narrow triangular patch. The eyes are orange-brown. The genitalia is depigmented and exposed.
