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Science and Technology


Ohio scientists say South African fossils are not a new species
Kent State's Lovejoy and Cleveland's Haile-Selassie question new species designation for well-publicized bones found in a South African cave
by WKSU's JEFF ST. CLAIR


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Jeff St. Clair
 
Skulls and other bones found in a South African cave may represent a new species of human ancestor, but probably not, according to two prominent Northeast Ohio scientists.
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Bones found in a South African cave have been labeled as belonging to a new member of the human family tree.

But WKSU’s Jeff St.Clair reports that not all scientists are on board with this claim.

LISTEN: Lovejoy disputes new species claim

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Owen Lovejoy teaches anthropology at Kent State University, and was part of the team that discovered the famous fossil Lucy in the 1970’s. 

Lovejoy says he’s seen many cases where scientists at first believed fossil finds to be a new species, only later to acknowledge that they belong to already familiar lineages.

And he thinks that’s the case with the bones recently found in South Africa: “In my opinion it’s probably Homo erectus.”

Homo erectus is a well-known early human ancestor found in sites all over the world. The proposed new species is called Homo naledi.

Lovejoy says the brain size of the new South African specimens may be on the small side, "but it’s within the range of early homo that we know from other sites.”

To back-up that point he says skulls of Homo erectus found in Dmanisi, Georgia, show that a wide variation in cranial capacity and bone structure existed within the species.   

Lovejoy says the discoverer’s claim that the South African bones were purposefully buried is “pure speculation.”

Cleveland Museum of Natural History curator Yohannes Haile-Selassie agrees, saying the bones "look a lot like Homo erectus."

Both Haile-Selassie and Lovejoy say that without evidence of the age of the South African fossils, it's hard to establish the significance of the the findings.

"Without knowing how old [naledi] is, it's going to be a problem in terms of where it belongs on the phylogenetic tree," says Haile-Selassie.


Related WKSU Stories

Some scientists disagree with new fossil findings
Thursday, June 4, 2015

Exploradio - Our cousin in the trees
Monday, April 9, 2012

KSU Professor Lovejoy discusses sex and human evolution
Thursday, October 1, 2009

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