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I. The family Cebidae is a small family of approximately 14 genera. These genera are extremely varied in structure and "habitus". They can be arranged in the following groups:
1. Callicebus. A very generalized, apparently unspecialized, type. Small. Primitive in some structural features. Insectivorous-frugivorous. Purely arboreal. Heavy forest. A very active leaper. Only moderately gregarious.
2. Cebus - Saimiri. Advanced forms, rather similar to Calleicebus in size and mixed insectivorous-frugivorous diet. Less competely[[completely]] arboreal than Callicebus. Extending into fairly light second-growth forest and "edges". Runners as well as leapers. Very active. Very gregarious.
3. The "marmosets". A whole host of small insectivores and carnivores. Not always exclusively arboreal. Extending into all sorts of forest and scrub. Runners as well as leapers (like squirrels). Very active. Only moderately gregarious.
This group includes Callimico, Saguinus, Leontideus, and Callithrux. In many ways, the evolutionary trends of this group reach their climax in Cebuella.

Two independently evolved groups of large "typically monkey-like" forms.
4. Pithecia - Chiropotes - Cacajao.
5. Lagothrix - Brachyteles - Ateles.
Both groups are insectivorous-frugivorous. Inhabitants of heavy forest. Active. Pithecia, etc., are leapers. Lagothrix, etc., are brachiators. Both groups less highly gregarious than capuchins or squirrel monkeys.

6. Alouatta. Large. Leaf-eating. Purely arboreal. Heavy forest. Not very active. Slightly sloth-like. Moderately gregarious.
7. Aotus. Rather small. Insectivorous-frugivorous. Purely arboreal. Heavy forest. A very active leaper. Only slightly gregarious.