PHYLOGENY AND EVOLUTION OF SELECTED PRIMATES AS DETERMINED BY SEQUENCES OF THE EPSILON-GLOBIN LOCUS AND 5'-FLANKING REGIONS

We studied phylogenetic relationships of 39 primate species using sequ ences of the epsilon-globin gene. For 13 species, we also included fla nking sequences 5' of this locus. Parsimony analyses support the assoc iation of tarsiers with the anthropoids. Our analysis of New World mon keys supports the model in which the callitrichines form a clade with Aotus, Cebus, and Saimiri, with Cebus and Saimiri being sister taxa. H owever analysis of the 5' flanking sequences did not support grouping the atelines with Callicebus and the pitheciins. Our data support the classification of platyrrhines into three families, Cebidae (consistin g of Cebus, Saimiri, Aotus, and the callitrichines; Atelidae-the ateli nes; and Pitheciidae-Callicebus and the pithiciins. The strepsirhines form well-defined lemuroid and lorisoid clades, with the cheirogaleids (dwarf and mouse lemurs) and Daubentonia (aye-aye) in the lemuroids, and the aye-aye being the most anciently derived. These results suppor t the hypothesis that nonhuman primates of Madagascar descended from a single lineage. Local molecular clock calculations indicate that the divergence of lemuroid and lorisoid lineages and the earliest diversif ication of lemuroids, occurred during the Eocene. The divergence of ma jor lorisoid lineages was probably considerably more recent, possibly near the Miocene-Oligocene boundary. Within hominoids some estimated d ates differ somewhat from those found with more extensive noncoding se quences in the beta-globin cluster.