Immunodiffusion Systematics of the Primates

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Abstract
Evolutionary relationships between New World monkeys and marmoset genera and the place of the Ceboidea within the primates are considered in terms of the immunological specificity of ceboid proteins. Antigenic distances between the New World primates are measured using antisera produced in rabbits to nine ceboid genera: Alouatta, Aotes, A teles, Callicebus, Cebus, Chiropotes, Lagothrix, Saimiri and Saguinus. A cladogram constructed on the basis of increasing degrees of antigenic distance between branches depicts Ceboidea as a monophyletic assemblage within which Alouatta is grouped with the Atelinae genera, Lagothrix and A teles, Chiropotes joins Cacajao and Cebus joins Saimiri. The joining of the cebid genera Aotes and Callicebus with callithricid genera Callimico and Saguinus into a single complex lineage suggests that Cebidae is a paraphyletic or polyphylctic taxon. A phylogenetic taxonomy for Platyrrhini is proposed.