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UF science discovery raises questions about origin of African mammals

GAINESVILLE, Fla. --- "Into Africa" rather than "Out of Africa" could well be the better description of how certain mammals originated and spread across the world, according to a University of Florida scientist, who has found the first evidence for origins in North America of a mammal thought to be endemic to Africa.

Long considered the cradle of many mammal species, Africa no longer lives up to that image with the discovery in the Wyoming badlands of 54 million-year-old skeletal remains of the first elephant shrew, said Jonathan Bloch, a UF paleontologist who describes his team's finding in today's issue of the journal Nature.

"Elephant shrews part of a group that includes elephants, sea cows and aardvarks, are thought to be endemic to Africa yet we have found evidence of their beginnings in North America," Bloch said. "This research has broad implications because it indicates there may have been a great deal more interchange in terms of how animals moved around the world as the continents broke up than previously thought."

The identification of the elephant shrew, a small-bodied, hopping mammal, is consistent with the observation that other mammals, including primates, also moved around the world during the course of their history, Bloch said.

"It is at least possible that primates, like primitive elephant shrews, evolved in North America and spread from there into Europe, Asia and Africa," said Bloch, who works at the Florida Museum of Natural History on the UF campus.

The first modern mammals appeared about 55 million years ago, roughly 10 million years after the mass extinction of the dinosaurs that had dominated them. In this Eocene period arose the first modern primates, the first recognizable horses and many other mammals, Bloch said.

"After the extinction of the dinosaurs 65 million years ago, there was an explosion of diversity," he said. "Mammals had a huge celebration with all the big predators gone and they just kin
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Contact: Jonathan Bloch
jbloch@flmnh.ufl.edu
352-392-1721
University of Florida
24-Mar-2005


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