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Groves (1993) divided Platyrrhini into two families, Callitrichidae and Cebidae, the traditional approach (see for example Martin, 1990; see also McKenna and Bell (1997), who used the earlier name Atelidae instead of Cebidae). But the evidence (reviewed by Groves, 2001c) is that the family Cebidae, in this traditional sense, is paraphyletic, and Nyctipithecidae (Aotidae), Pitheciidae and Atelidae must be extracted from it, while the marmoset group is closer to the core Cebidae and should be united with them.