Researchers have discovered a two-million-year-old ape skull that could represent the earliest known member of the modern baboon species.
The partial skull was found at Malapa, in the Cradle of Humankind World Heritage Site where the partial skeletons of the new early hominin species, Australopithecus sediba, were discovered in 2010.
"Baboons are known to have co-existed with hominins at several fossil localities in East Africa and South Africa and they are sometimes even used as comparative models in human evolution," said lead author of the study Christopher Gilbert from Hunter College of The City University of New York, US.
The skull confirms earlier suggestions that the fossil baboon species to which it belongs, Papio angusticeps, was in fact closely related to modern baboons, and quite possibly the earliest known members of the modern baboon species Papio hamadryas.
"The specimen from Malapa and our current analyses help to confirm the suggestion of previous researchers that P. angusticeps may, in fact, be an early population of P. hamadryas," Gilbert noted.
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Analyses of the specimen at Malapa, and the group of fossil specimens traditionally placed in the fossil species P. angusticeps, suggest that P. angusticeps displays anatomy that is consistent with modern baboon populations.
"If you placed a number of P. angusticeps specimens into a modern osteology collection, I don't think you'd be able pick them out as any different from those of modern baboons from East and South Africa," Gilbert pointed out.
The findings were presented in the journal PLOS ONE.
