Posted on 12/01/2005 11:43:46 AM PST by Pharmboy
This image provided by the journal Science shows the skeleton, with wing and tail feather impressions, of the tenth specimen of the first known bird, Archaeopteryx, in ventral view. The new specimen provides important details on the feet and skull of these birds and strengthens the widely but not universally accepted argument that modern birds arose from theropod dinosaurs. (AP Photo/Science)
A new analysis of Archaeopteryx, the earliest known birdlike animal, shows it had feet like dinosaurs — a finding that adds weight to the belief that the birds frequenting backyard feeders today are descendants of mighty ancient carnivores.
While not all scientists agree, many consider Archaeopteryx the first bird, since it had wings and was the first fossil found with feathers.
Details have been lacking on the animals, however, since only a few fossil specimens have been found. The new one, reported in Friday's issue of the journal Science, is the 10th known and one of the most complete.
Contrary to what had been thought, the new fossil shows that the first toe was not reversed in Archaeopteryx, as is the case on current birds, according to a team led by Gerald Mayr of Research Institute Schenkenberg in Frankfurt, Germany.
Lack of the reversed toe would hamper the animal's ability to perch like current birds, the researchers said.
On the other hand, it's second toe could be extended, like those of theropod — beast-footed — dinosaurs, a group that included such well known examples as T. rex.
Archaeopteryx was considerably smaller, however, close to the size of a magpie. The new example lived about 150 million years ago in what is now Bavaria.
Matthew T. Carrano, a dinosaur expert at the Smithsonian's National Museum of Natural History, agreed that the discovery supports those who consider birds descendants of dinosaurs.
The lack of a reversed toe doesn't mean an Archaeopteryx couldn't sit in a tree, but probably indicates that it was not a habitually tree-living animal, said Carrano, who was not part of Mayr's team.
"We assume it could fly but we don't have a lot of information about its flying ability," he added.
Most of the known specimens are partial so the new one adds to the knowledge of the animals, Carrano said.
Archaeopteryx was originally identified as the earliest fossil bird because of its feathers, Carrano said. Since then other dinosaurs with feathers have been found; if Archaeopteryx were discovered today it probably would be considered more dinosaur than bird, he said.
But while the new discovery shows that Archaeopteryx was less birdlike than had been thought, he added, there were a lot of intermediate steps between dinosaurs and birds and this was one of them.
The specimen, discovered in the Solnhofen area of Germany, was acquired by the Wyoming Dinosaur Center in Thermopolis, Wyo.
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On the Net:
Science: http://www.sciencemag.org
Well, this might settle the bird-dinosaur thingy...
"Dear, there's a dinosaur in the birdbath"
"A new analysis of Archaeopteryx, the earliest known birdlike animal, shows it had feet like dinosaurs — a finding that adds weight to the belief that the birds frequenting backyard feeders today are descendants of mighty ancient carnivores."
Hey, you know what would really be ironic? If the bird flu killed us all and "dinosaurs" outlasted man after all. That would be quite the plot twist.
Well, I once had an Analyst Girlfriend with a Gargantuan Nose.
Thanks for the ping. Good article. I've used the evolution ping list three times today, so I'm reluctant to zing everyone again. But this is good ... I'm mulling it over.
My Aunt Ruth has crows feet.
I want to avoid ping-fatigue. Should I deploy the list for this article?
The other's aren't taking off.
Does she keep them in a box under her bed?
And so does Maureen Dowd.
Hit the list - let's have some science, rather than politics. JMO.
Better than having man hands.
My grandmother had a turkey neck. Hmm...I guess that means I'm a dinosaur.
This one has some meat to it (feet meat to be exact); I say "What the hey!" do it! :)
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Dinosaur, the other white meat.
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