Leontocebus

Leontocebus is the genus of the saddle-back tamarins, squirrel-sized New World monkeys of the family Callitrichidae. They were split from the tamarin genus Saguinus on the basis of genetic data and because saddle-back tamarins live alongside members of Saguinus more often than two members of one genus would be expected to, although some authors still treat Leontocebus as a subgenus of Saguinus. Where the two groups share a forest, saddle-back tamarins typically occupy lower strata than the Saguinus species. They have longer and narrower hands than Saguinus species, possibly an adaptation to searching for insects hidden in knotholes, crevices, bromeliad tanks and leaf litter, while Saguinus species more often take insects exposed on leaves or branches.