All rights reserved. This document may be used, with this header included, for noncommercial purposes within a subscribed institution . No copies of this work may be distributed electronically outside of the subscribed institution, in whole or in part, without written permission from the JHU Press . The single species, C. goeldii, occurs in the upper Amazonian rainforests of southern Colombia, eastern Ecuador, eastern Peru, western Brazil, and northern Bolivia. Adults are brownish black, with buffy markings on the back of the neck and two or three light buff-colored rings on the basal part of the tail.
Young animals lack the buffy tail rings and sometimes the buff on the back.
The head or even the entire dorsal surface may be spotted with white. The hair is thick and soft. There are no ear tufts. A mane drapes from the neck and shoulders, and the elongated hairs of the rump extend skirtlike over the base of the tail. Although the facial appearance, foot structure, and clawlike nails resemble those of other callitrichids, the dental formula and cranial configuration are like those of the Cebidae.