Amazing haul of ancient human finds unveiled

A new haul of ancient human remains has been described from an important cave site in South Africa.

The finds, including a well-preserved skull, bolster the idea that the Homo naledi people deliberately deposited their dead in the cave.

Evidence of such complex behaviour is surprising for a human species with a brain that’s a third the size of ours.

Despite showing some primitive traits it lived relatively recently, perhaps as little as 235,000 years ago.

That would mean the naledi people could have overlapped with the earliest of our kind – Homo sapiens.

In a slew of papers published in the journal eLife, Prof Lee Berger from the University of the Witwatersrand in Johannesburg, Prof John Hawks from the University of Wisconsin-Madison, US, and their collaborators have outlined details of the new specimens and, importantly, ages for the remains.

The H. naledi story starts in 2013, when the remains of almost 15 individuals of various ages were discovered inside the Dinaledi chamber – part of South Africa’s Rising Star Cave system.

At the same time, the researchers were exploring a second chamber about 100m away, known as Lesedi (“light” in the Setswana language which is spoken in the region).

 The Lesedi chamber yielded the remains of two adults and a child

The finds from Dinaledi were published in 2015, but remains from the Lesedi chamber had not previously been presented, until now.

The latest specimens include the remains of at least three individuals – two adults and a child.

One of the adults has a “wonderfully complete skull”, according to Prof Hawks. This tough-looking specimen is probably male, and has been named “Neo”, which means “a gift” in the Sesotho language of southern Africa.

Examination of its limb bones shows that it was equally comfortable climbing and walking.

The fact that Homo naledi was alive at the same time and in the same region of Africa as early forms of Homo sapiens gives us an insight into the huge diversity of different human forms in existence during the Late Pleistocene.

“Here in southern Africa, in this time range, you have the Florisbad skull, which may be an ancestor or close relative of modern humans; you’ve got the Kabwe skull, which is some kind of archaic human and possibly quite divergent; you’ve got evidence from modern people’s genomes that archaic lineages have been contributing to modern populations and may have existed until quite recently,” said Prof Hawks.

Kabwe, naledi
Image captionH. naledi (R) seems to have shared southern Africa with distinct human species, such as Kabwe man (L)

“You have this very primitive form of Homo [naledi] that has survived alongside these other species for a million years or more. It is amazing the diversity that we are now seeing that we had missed before.”

As to how H. naledi held on to its distinctive characteristics while living cheek-by-jowl with other human species, Prof Hawks said: “It’s hard to say it was geographic isolation because there’s no boundary – no barrier. It’s the same landscape from here to Tanzania; we’re in one continuous savannah, woodland-type habitat.

He added that the human-sized teeth probably reflected a diet like that of modern humans. In addition, H. naledi had limb proportions just like ours and there is no apparent reason why it could not have used stone tools.


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