Human cranial diversity and evidence for an ancient lineage of modern humans

This study examines the genetic affinities of various modem human groupings using a multivariate analysis of morphometric data. Phylogenetic relationships among these groupings are also explored using neighbor-joining analysis of the metric data. Results indicate that the terminal Pleistocene/early Holocene fossils from Australasia exhibit a close genetic affinity with early modem humans from the Levant. Further-more. recent human populations and Upper Paleolithic Europeans share a most recent common ancestor not shared with either the early Australasians or the early Levantine humans. This pattern of genetic and phylogenetic relationships suggests that the early modem humans from the Levant either contributed directly to the ancestry of an early lineage of Australasians, or that they share a recent common ancestor with them. The principal findings of the study, therefore, lend support to the notion of an early dispersal from Africa by a more ancient lineage of modem human prior to 50 ka, perhaps as early as OIS 5 times (76-100 ka). (C) 2007 Elsevier Ltd. All rights reserved.