Whoops, typo, that should be Homo habilis.

M

On Thu, Jul 2, 2009 at 12:38 PM, Michael Balter <[log in to unmask]> wrote:
The hypothesis that anthropoids arose in Asia is not new, but this research does not suggest that the human line originated anywhere other than Africa. The earliest fossil hominin candidates, dated 5-7 million years ago, were all found in Africa (Orrorin, Sahelanthropus, Ardipithecus), as were all of the australopithecine candidates for ancestors of Homo erectus and Homo habilus (the latter is a debated species.) There are a few researchers who think that Homo erectus might have arisen in Asia, because there are fossils of Homo erectus there about as old as the earliest known examples from Africa; but even if so, it would probably have been the result of migration of australopithecines from Africa to Asia--something not yet demonstrated in the fossil record.

Human evolution can get confusing because one can trace "human origins" back to the earliest life on earth and in this particular case to an early anthropoid ancestor of a number of primate lineages, including monkeys and apes which diverged tens of millions of years ago.

MB


On Thu, Jul 2, 2009 at 12:09 PM, SAM ANDERSON <[log in to unmask]> wrote:
 http://www.sciencedaily.com/releases/2009/06/090630202125.htm

New Fossil Primate Suggests Common Asian Ancestor, Challenges Primates Such As 'Ida'


The discovery of this new fossil primate from Myanmar (previously known as Burma) suggests that the common ancestor of humans, monkeys and apes evolved from primates in Asia, not Africa as many researchers believe. (Credit: Mark A. Klingler/Carnegie Museum of Natural History)

ScienceDaily (July 1, 2009) — According to new research published online in the Proceedings of the Royal Society B (Biological Sciences) on July 1, 2009, a new fossil primate from Myanmar (previously known as Burma) suggests that the common ancestor of humans, monkeys and apes evolved from primates in Asia, not Africa as many researchers believe.

A major focus of recent paleoanthropological research has been to establish the origin of anthropoid primates (monkeys, apes and humans) from earlier and more primitive primates known as prosimians (lemurs, tarsiers and their extinct relatives). Prior to recent discoveries in China, Thailand, and Myanmar, most scientists believed that anthropoids originated in Africa. Earlier this year, the discovery of the fossil primate skeleton known as "Ida" from the Messel oil shale pit in Germany led some scientists to suggest that anthropoid primates evolved from lemur-like ancestors known as adapiforms.

According to Dr. Chris Beard–– a paleontologist at Carnegie Museum of Natural History in Pittsburgh, Pennsylvania and a member of the international team of researchers behind the Myanmar anthropoid findings––the new primate, Ganlea megacanina, shows that early anthropoids originated in Asia rather than Africa. These early Asian anthropoids differed radically from adapiforms like Ida, indicating that Ida is more closely related to modern lemurs than it is to monkeys, apes and humans.

The 38-million-year-old Ganlea megacanina fossils, excavated at multiple sites in central Myanmar, belong to a new genus and species. The name of the new species refers to a small village, Ganle, near the original site where the fossils were found, and the greatly enlarged canine teeth that distinguish the animal from closely related primates. Heavy dental abrasion indicates that Ganlea megacanina used its enlarged canine teeth to pry open the hard exteriors of tough tropical fruits in order to extract the nutritious seeds contained inside.

"This unusual type of feeding adaptation has never been documented among prosimian primates, but is characteristic of modern South American saki monkeys that inhabit the Amazon Basin," says Dr. Beard. "Ganlea shows that early Asian anthropoids had already assumed the modern ecological role of modern monkeys 38 million years ago."

Ganlea and its closest relatives belong to an extinct family of Asian anthropoid primates known as the Amphipithecidae. Two other amphipithecids, Pondaungia and Myanmarpithecus, were previously discovered in Myanmar, while a third, named Siamopithecus, had been found in Thailand. A detailed analysis of their evolutionary relationships shows that amphipithecids are closely related to living anthropoids and that all of the Burmese amphipithecids evolved from a single common ancestor. Some scientists had previously argued that amphipithecids were not anthropoids at all, being more closely related to the lemur-like adapiforms.

The discovery of Ganlea strongly supports the idea that amphipithecids are anthropoids, because adapiforms never evolved the features that are necessary to become specialized seed predators. Indeed, all of the Burmese amphipithecids appear to have been specialized seed predators, filling the same ecological niche occupied by modern pitheciine monkeys in the Amazon Basin of South America. During the Eocene when Ganlea and other amphipithecids were living in Myanmar, they inhabited a tropical floodplain that was very similar to the environment of the modern Amazon Basin.

Fossils of Ganlea megacanina were first discovered in Myanmar in December 2005. The fieldwork is a long-term collaboration by scientists from several institutions in Myanmar; as well as the University of Poitiers and the University of Montpellier in France; Carnegie Museum of Natural History in Pittsburgh, PA; and the Department of Mineral Resources in Bangkok, Thailand. Funding was provided by the U.S. National Science Foundation and the Centre National de la Recherche Scientifique in France.


Adapted from materials provided by Carnegie Museum of Natural History.


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S E ANDERSON- 
author of "The Black Holocaust for Beginners"
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Michael Balter
Contributing Correspondent, Science
Adjunct Professor of Journalism,
Boston University

Email:           [log in to unmask]

Website:       michaelbalter.com
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******************************************
Michael Balter
Contributing Correspondent, Science
Adjunct Professor of Journalism,
Boston University

Email:           [log in to unmask]

Website:       michaelbalter.com
Balter's Blog: michael-balter.blogspot.com
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