Misleading Headlines Dept: “New Fossils Illustrate ‘Bushiness’ of Human Evolution”

Perhaps years from now, the term “Bushiness of Human Evolution” will have a different meaning. As for now, however, it has little to do with the bible-thumping, science-defying U.S. President, and everything to do with the “branches” of human evolution.

New Fossils Illustrate “Bushiness” of Human Evolution

Fossils support the separate evolution of Homo habilis and Homo erectus, point to a gorillalike social structure for the latter

By JR Minkel

The late evolutionary biologist Stephen Jay Gould used to rail against the notion of a ladder of perfection rising from early humanlike species to Neandertals to Homo sapiens at the pinnacle. Two new fossils unearthed near a lake in Kenya bear out Gould’s preferred metaphor for human evolution—that of a bush with many branches.

The first specimen, a jawbone assigned to the hominid (roughly: human ancestor) species Homo habilis, dates to a time 1.44 million years ago when the more recent species Homo erectus also roamed Ileret, a site east of Kenya’s Lake Turkana where the fossil was excavated.

Researchers have often assumed that H. habilis evolved into the larger H. erectus, from which our species likely branched. But if the two early species coexisted, it is much more plausible that they evolved separately from a common ancestor, as opposed to habilis simply giving way to erectus, according to a report in Nature.

The oldest habilis and erectus fossils found in East Africa date to 1.9 million years ago, indicating that they cohabitated in the region for half a million years, the researchers say. “The problem is there was not a clear date for the last occurrence of Homo habilis,” says study co-author Fred Spoor, professor of evolutionary anatomy at University College London.

Spoor says it is still possible that erectus evolved from habilis in places other than Lake Turkana, where the older species would have reencountered the newer one.

But if not, the species’ shared ancestor would have had to live two million to three million years ago, he says. And the only remains from this time are fragments of stone tools and a few teeth, he notes, leaving up in the air whether the ancestor was much different from both species or more like the older habilis.

Of course, George W. Bush and those like him won’t leave any fossils. They’ll be magically beamed to heaven in human form to have an eternity of seafood buffets and golf outings with Jesus himself after the Rapture.

–WKW