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2009-06-19 – Mongolia: Nuovo Psittacosauro (new Psittacosaur)

Parrot-like dinosaur found in Mongolia

A new dinosaur resembling a giant parrot has been discovered in Mongolia.

 By Chris Irvine
Published: 7:00AM BST 17 Jun 2009
New dinosaur, Psittacosaurus gobiensis: Parrot-like dinosaur found in Mongolia
A new dinosaur, named Psittacosaurus gobiensis, meaning ‘parrot dinosaur’ has been discovered in Mongolia

The creature, Psittacosaurus gobiensis whose name means “parrot lizard”, is thought to have lived about 110 million years ago.

Psittacosaurs are noted for being the most species-rich dinosaur genus with at least nine different species, including the latest found in the Gobi Desert, a famous dinosaur graveyard.

Features of the dinosaur included a near perfect skull, strong jaw muscles and a powerful biting and crushing bill – showing that it evolved structures like those in today’s parrots.

The three feet long psittacosaurs may also have had a diet dominated by nuts and seeds, owing to the presence of many large stomach stones, according to the findings published in Proceedings of the Royal Society B: Biological Sciences.

Prof Paul Sereno, a Biologist from the University of Chicago, said analysis of its skull showed it chewed its food in a similar way to modern parrots.

“These and other features, along with the presence of numerous large stomach stones, suggest that psittacosaurs may have had a high-fibre, nut eating diet,” he said.

Its short snout just a third of the skull length was different to most dinosaurs, giving the skull its parrot-esque profile.

They ate nothing but plants and walked normally on two legs but could reach the ground with their three-fingered hands.

They were good runners and were extremely successful in Asia about 100 million years ago, during the Cretaceous Period.

“Psittacosaurs are all relatively small in body size, ranging from one to two metres in body length. Their geographic range is limited to central Asia, and their temporal range may be as narrow as 10-20 million years in the mid Cretaceous,” said Prof Sereno.

It is a member of the Ceratopsia group of herbivorous, beaked dinosaurs, which also include the more famous Triceratops.

source: telegraph.co.uk

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Other links: click here

giugno 19, 2009 Posted by | 1 Cretaceo, Articolo sc. di riferimento, Asia, Mesozoic, P - Preservazione eccezionale, P - Ritrovamenti fossili | , , , , | Lascia un commento

2009-01-18 – Minotaurasaurus Ramachandrani: a new dinosaur from Gobi desert

New dinosaur species named after Indian-origin scientist

New Delhi (PTI): A previously unknown species of dinosaurs found in the Gobi desert has been named after an Indian-origin scientist who made available a virtually complete skull in his possession for scientific scrutiny.

American paleontologists Clifford Miles and Clark Miles, who studied the skull with a bull-like appearance with flared nostrils, described it as belonging to a new genus and species of ankylosaurid.

Ankylosaurids are armoured dinosaurs that evolved about 125 million years ago and were found in North America, East Asia and Europe.

Indian-origin scientist V.S. Ramachandran bought the skull from a Japanese fossil collector and displayed it at the Victor Valley Museum, California.

The U.S. scientists at the Western Paleontological Laboratories in Utah named the new species as Minotaurasaurus Ramachandrani, after Ramachandran made the skull available to them.

Miles reported their findings in the latest issue of Indian research journal Current Science.

The generic name ‘Minotaurasaurus’ means ‘man-bull reptile’ in Latin. The species has been named so because of the bull-like appearance of the skull which was found in the Gobi desert.

The paleontologists believe that the 30cm long skull represents a new dinosaur that grew to about 4.2m long from a family of extinct reptiles called ankylosaurid.

The ankylosaurids had thick armoured plating of fused bone often interspersed with a variety of spikes and lumps. Some species even had armoured eyelids.

The specimen studied by Miles has complete triangular skull and highly ornamented nasal which give the skull a bull-like appearance with flaring nostrils making it one of the most ornamental dinosaurs discovered yet.

Studies indicates that the animal was not fully grown and, therefore, it is likely that larger animals could be discovered soon.

The teeth of the dinosaur are leaf shaped with each one bearing vertical striations (series of ridges) dividing the crown surface into eight cusps.

If validated, then this distinct species might join a handful of other Indian name bearing dinosaurs species like Barapasaurus tagorie, Kotasaurus yamanapalliensis, found in Andhra Pradesh and Rajasaurus narmadensis in Gujarat.

source: http://www.hindu.com/thehindu/holnus/008200901171011.htm

gennaio 18, 2009 Posted by | - R. Dinosauri, 1, 1 Cretaceo, An. Vertebrates, Asia, Mesozoic, P - Ritrovamenti fossili, Paleontology / Paleontologia | , , , , , , , | Lascia un commento

2008-12-03 – Mongolia: sparito un dinosauro (Dinosaur fossil poachers)

Sparito un dinosauro individuato da ricercatori del Cleveland Museum of Natural History che lo avevano momentaneamente copeto in attesa di estrarlo dai sedimenti.

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Posted by John Mangels/

Dinosaur fossil poachers apparently victimize Cleveland Museum of Natural History

Posted by John Mangels/Plain Dealer Reporter November 30, 2008 06:30AM

Categories: Real Time News
Michael Ryan, curator of vertebrate paleontology at the Cleveland Museum of Natural History, poses with a Triceratops skeleton that is half of a new dinosaur display at the museum. It is assumed that poachers took the Tarbosaurus bataar skeleton that was to face off against Triceratops, so a Tyrannosaurus rex will take its place when the exhibit opens Dec. 20.

Maybe I wasn’t paying attention and walked right by it, Michael Ryan thought.

Was it possible not to notice a cascade of broken dinosaur bones spilling down a hillside in Mongolia’s Gobi Desert? The burly Canadian fossil hunter had been chatting with a student, so maybe he had been distracted.

Ryan retraced his steps. He hiked back down into the ravine he remembered from a visit two years earlier, when he had first spotted the tantalizing bones of Tarbosaurus bataar, an Asian cousin of Tyrannosaurus rex, poking out of the sun-baked earth. Nope. Nothing there.

He double-checked the GPS coordinates. Dead-on. He tried the adjacent gully, on the chance he was off-target. Still nothing.

The bones were gone. Not a shard remained. The dinosaur skeleton Ryan had planned to painstakingly reassemble and feature as a centerpiece at the Cleveland Museum of Natural History, where he is head of vertebrate paleontology, had vanished, as if swallowed by the desert sands — another victim of fossil poaching.

“It would have been the most significant chunk of Tarbosaurus in North America,” Ryan said wistfully. “It’s sort of the one that got away.”

It’s impossible to say where the 65 million-year-old-plus bones ended up. There’s a thriving international black market for fossils, particularly those from developing countries that lack strict regulations and policing efforts. The Tarbosaurus skeleton may have been sold to a private collector (although it would have required extensive reconstruction). Or it may have been ground to dust for use in traditional Asian medicines.

Wherever the fossil is, its scientific and educational value is lost. Fewer than three dozen Tarbosaurus specimens exist in museums and research labs worldwide — an inadequate sample for researchers trying to learn about the diversity, behavior and lineage of this fearsome killer.

“If you only knew dogs or cats or kangaroos from 24 specimens, you wouldn’t have a very good picture of what the whole animal looked like,” Ryan said.

Dino Day at Cleveland Museum of Natural History

On Saturday, Dec. 20, the Cleveland Museum of Natural History will hold Dino Day to unveil its new Tyrannosaurus rex skeleton. The full-size T. rex, a replica of the original fossil in Montana’s Museum of the Rockies, will be posed facing off against the Cleveland museum’s recently acquired Triceratops, the second-largest dinosaur of the Late Cretaceous Period.

The museum will hold several activities from noon to 4 p.m., including dinosaur craft-making, live animal displays at 1 and 3 p.m. featuring “Raptor Show” and “Dinosaur Descendants,” a 1:30 p.m. talk by fossil hunter Darin Croft, and a 2 p.m. T. rex roaring contest.

Activities are free with museum admission. The museum is at 1 Wade Oval Drive in University Circle. For details see www.cmnh.org

Some differences with T. rex 

Tarbosaurus belonged to the therapod category of dinosaurs, whose upright-walking, mainly meat-eating members included the ancestors of birds. Scientists believe Tarbosaurus probably was from a different ancestral group, or genus, than T. rex, although some have argued they are more closely related — two species of Tyrannosaurus, one evolving in North America and the other in Asia between 70 million and 65 million years ago.

At about 16 feet tall, Tarbosaurus was slightly smaller than T. rex, and its arms were even shorter than T. rex’s tiny ones. Both used their long tails to counterbalance their huge heads. Tarbosaurus’ skull, up to 4 feet in length and filled with daggerlike teeth, was narrower than T. rex’s and had some structural differences.

The display space that a plaster cast of the Tarbosaurus skeleton would have occupied at the Cleveland museum will instead be filled with two recently acquired dinosaur replicas: the ever-popular T. rex, facing off against a spike-skulled Triceratops. The museum bought the skeletons (which are casts, not original fossils) from a reputable Canadian company. The exhibit opens Dec. 20.

It was another T. rex, also purchased legitimately, that demonstrated how lucrative the fossil trade can be. In 1997, the Field Museum in Chicago partnered with McDonald’s and Disney World to buy a fossil nicknamed Sue, the largest and most complete T. rex skeleton ever found. The record-setting $8.4 million auction bid kept the bones in the public and scientific domain, but poachers no doubt took notice.

Not everyone in the poaching trade stands to make handsome profits. In fossil-rich but impoverished regions of China, Mongolia and Africa, some people scavenge for fossils as a means of survival, selling what they find to brokers for a fraction of what the bones might eventually fetch on the black market.

Trying to bridge a cultural divide

Because of cultural differences, lack of education or simply the economics of survival, they don’t take into account the specimens’ scientific value.

“It’s not like these guys are trying to buy a swimming pool or a second car,” Ryan said of the nomadic people of the Gobi. “They see us driving these big fancy trucks and taking the bones away. As rich Europeans and North Americans coming in there, it’s hard to say, ‘Thou shalt not do these things,’ because that’s what it appears we’re doing. They’re unaware that [a fossil legitimately acquired for research] never permanently leaves the country.”

During the several weeks each year that Ryan searches for dinosaur bones in Mongolia, he also speaks to schoolchildren, in hopes of breaking the generational cycle of poaching. He explains their country’s geologic history, its abundant and important fossils and the process of extracting, casting, studying and ultimately returning the specimens.

A young Mongolian paleontologist, Bolortsetseg Minjin, is taking additional steps to increase her country’s appreciation for its past. Last year she founded the nonprofit Institute for Study of Mongolian Dinosaurs in the capital city of Ulan Bator. Its goals are to help train more home-grown paleontologists, house a research lab to clean and preserve fossils and develop a museum to display dinosaur bones and other native artifacts.

Poachers had already been at work on the Tarbosaurus fossil by the time Ryan first came upon it in a national park in 2005. The thieves had hacked off its skull, hands and feet — the most profitable parts — leaving behind its smashed skeletal bones partially embedded in sand and stone. There were backbones, the pelvis with leg bones attached, ribs and teeth. About 60 percent of the fossil remained, plenty for research and display purposes.

Ryan’s crew that year was mostly adventure tourists, untrained dinosaur enthusiasts who pay to take part in science expeditions. They lacked the experience to excavate the Tarbosaurus in the time available, so Ryan reluctantly left the fossil in the ground. He checked on it the following year but again was committed to other work.

That return visit in 2006 may have rekindled the poachers’ curiosity.

“Whatever they can find that’s of interest to them, they’ll take” immediately, Ryan said. “But if you come back and express an interest in something else, they figure you must know more than they do, so they’re going to go back in and see what you’re curious about. I suspect that’s what happened here. Somebody either saw or reported that we spent part of a day reopening an old quarry, and they went back to see what was there.”

By the time Ryan got back to Mongolia with an experienced crew in August 2007, it was too late. “There wasn’t a scrap of bone left,” the scientist said.

Poachers left behind this empty vodka bottle at the Gobi Desert site where they possibly dug up a skeleton of the T. rex-like dinosaur Tarbosaurus bataar.

Signs of crude excavation workThe thieves did leave some clues: An empty bottle of vodka in the hole where the skeleton had been, cigarette butts and dozens of containers of super glue, which poachers pour over the broken bones so they can keep the pieces together.

In the past, Ryan and his colleagues have found crude, hand-made tools — a chisel fashioned from a sharpened engine rod; a hammer made of a rock duct-taped to a stick.

Such implements don’t lend themselves to careful fossil extraction. But there are signs the poachers are growing more sophisticated, trying to copy techniques the scientific crews use. Ryan has seen evidence of makeshift “field jackets,” the protective layers of plaster and burlap that paleontologists encase fossils in for transport. The poachers haven’t quite gotten the hang of it yet. “They put one layer of plaster on a 2-ton block [of rock and fossils] and flip it over, and all the bones fall out.”

Catching poachers is difficult even in a country like the United States, which has far more resources and manpower than developing nations. The U.S. Immigration and Customs Enforcement agency’s top priority is anti-terrorism, but a spokeswoman says it sometimes gets involved in fossil-poaching cases. Last year, ICE agents seized 22 dinosaur eggs from a Los Angeles auction house after they were smuggled from China.

A 2005 National Geographic magazine report on poaching documented that international fossil sales often entailed payoffs to police and customs agents.

But Ryan said Mongolia has recently tightened its export controls. The tougher rules make it more difficult for scientists to temporarily send legitimately collected specimens home for study, meaning Ryan will do more of his research work in Mongolia. But that’s a small price to pay, he said, if it gets more fossils in museums and off the black market.

source: http://blog.cleveland.com/metro/2008/11/dinosaur_fossil_poachers_appar.html

dicembre 3, 2008 Posted by | - R. Dinosauri, Asia, Commercio illegale, Italiano (riassunto), P - Ritrovamenti fossili, Paleontology / Paleontologia | , , , , , | Lascia un commento

2008-10-23 – Epidexipteryx hui: le piume per “esibizionismo” e non per volare (2)

Dopo quasi un mese dal lancio mediatico della scoperta di Epidexipteryx hui se ne torna a parlare, così aggiorniamo le notizie.

Epidexipteryx hui è un dinsoauro teropode il cui reperto fossile presenta resti di piumaggio in particolare anche su una coda dall’aspetto assai bizzarro.

L’età del reperto, l’appartenenza al gruppo dei teropodi (lo stesso dela maggior parte dei dinosauri piumati, e quello dal quale si evolveranno poi gli uccelli), e il fatto che il piumaggio dell’esemplare sembra non avere attinenza con la capacità di volare, fanno ritenere gli studiosi che il piumaggio possa essere nato con una funizone di “visual communication” (l’esempio attuale più classico è quello della coda dei pavoni).

Epidexipterix hui, from Nature

Epidexipterix hui, from Nature

A mio modesto parere, non essendo uno specialista di dinosauri, sebbene è chiaro che le piume della coda avevano un significato “visuale”, ciò non esclude che il piumaggio in genere possa essere un carattere evolutivo legato inizialmente alla “regolazione termica”.

precedente post: Epidexipteryx hui : le piume per “esibizionismo” e non per volare

Epidexipteryx - Images courtesy Qui Ji & Xing Lida

Epidexipteryx - Images courtesy Qui Ji & Xing Lida

P:S: the informal name given to this dinosaur is “Hushiyaolong” after the name of “Hu Yaoming”, a young deceased Chinese paleomammalogist. The fossil specimen will be exhibited at the Paleozoological Museum of China starting October 25 (link).
The fossil specimen of Epidexipteryx hui (Hushiyaolong) (Xinhua photo)

The fossil specimen of Epidexipteryx hui ("Hushiyaolong") (Xinhua photo)

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see for comments of Dr Angela Milner, associate keeper of palaeontology at the Natural History Museum, London:

New feathered dinosaur looks like déjà vu for birds, but not a
DigitalJournal.com – 2008-10-27  – It’sa dinosaur with display feathers, but no flight feathers. It dates from Middle to Late Jurassic, and it would have been for enthusiasts only as a pet.

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Other links (updated on 2008-10-23 11:02 Italy):

New feathered dinosaur discovered
BBC News – 7 ore fa
By James Morgan The fossil of a “bizarre” feathered dinosaur from the era before birds evolved has been discovered in China.
Bird-Like Dinosaur Sported Bizarre Tail Feathers
FOXNews – 9 ore fa
By Jeanna Bryner Epidexipteryx is the oldest theropod (two-legged meat-eating dinosaur) known to possess display feathers. Epidexipteryx is the oldest
Tiny dinosaur ‘the peacock of its day’
Scotsman – 9 ore fa
A PIGEON-SIZED feathered dinosaur with impressive tail plumage may have been the peacock of its day, scientists have discovered.
Early dinosaur’s feathers were for show, not flight
CBC.ca – 13 ore fa
Epidexipteryx, a new feathered maniraptoran dinosaur from the Jurassic period of China, is a primitive, flightless member of the avialan group.
First Dinosaur Feathers for Show, Not Flight?
National Geographic – 13 ore fa
One of the oldest known dinosaur relatives of birds had “bizarre” anatomy, including long, ribbon-like tail feathers that suggest plumage may have first
Dinosaur feather mating discovery
The Press Association – 14 ore fa
A pigeon-sized feathered dinosaur with impressive tail plumage may have been the peacock of its day, scientists have discovered.
Weird dino rewrites the book on birds
AFP – 14 ore fa
PARIS (AFP) — A tiny, egg-robbing dinosaur that lived more than 150 million years ago could help explain a key phase in the evolution of birds,
Fancy Feathers Predated Flight in Dinosaur-Bird Hybrid
Wired News – 15 ore fa
By Alexis Madrigal October 22, 2008 | 12:16:03 PMCategories: Dinosaurs A part-bird, part-dinosaur described in the journal Nature this week didn’t have
China finds fossils of small feathered dinosaur
Reuters UK – 15 ore fa
HONG KONG (Reuters) – Archaeologists in China have discovered fossils of a pigeon-sized feathered dinosaur which they believe to be an ancestor of birds.
Shake a tail feather: Scientists reveal the pigeon-sized dinosaur
Daily Mail – 14 ore fa
By Daily Mail Reporter Is it a bird? Is it a dino-saur? The answer to both questions is yes. This bizarre pigeon-sized creature, which roamed the planet
Shake a tale feather: Scientists reveal the pigeon-sized dinosaur
Daily Mail – 14 ore fa
By Daily Mail Reporter A strange pigeon-sized dinosaur that roamed the planet more than 150 million years ago was the oldest known relative of birds,
Shake Your Jurassic Tail Feather
Discover Magazine – 14 ore fa
In recent years, dinosaurs have gotten awfully cute. They’re no longer Victorian lumps of saggy muscle. A lot of them are not even frightening.
New bizarre feathered dinosaur discovered in China
Science Centric – 15 ore fa
by Stanislav P. Abadjiev | 22 October 2008 17:00 GMT — A new stage in the early history of birds is published in the most recent issue of the journal Nature

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Other links, in german:

 

Chinesischer Saurier hatte bereits Federn, flog aber noch nicht
WELT ONLINE – 5 ore fa
Oktober 2008, 02:43 Uhr Peking – Chinesische Forscher haben in der Inneren Mongolei das Skelett einer bisher unbekannten Dinosaurier-Art ausgegraben. Das Skelett stamme von einem halbwüchsigen Tier, es handle sich dabei um den ältesten federtragenden,
Kurioser Vogelsaurier aus der Jurazeit Frankfurter Allgemeine Zeitung
Das Geheimnis der gefiederten Echsen derStandard.at
WELT ONLINE
e altri 66 articoli simili »


Wissenschaft aktuell Nachrichtendienst

Hui: Schicke Schwanzfedern zierten neu entdeckte Übergangsform
Wissenschaft aktuell Nachrichtendienst – 16 minuti fa
Das Fossil eines frühen Vogelverwandten macht das Wissen rund um den Übergang zwischen Sauriern und Vögeln noch komplexer: Fliegen konnte Epidexipteryx hui zwar vermutlich nicht, aber er hatte bereits ein schmückendes Federkleid.

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Original scientific article:

Fucheng Zhang1, Zhonghe Zhou1, Xing Xu1, Xiaolin Wang1 & Corwin Sullivan1

  1. Laboratory of Evolutionary Systematics of Vertebrates, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, PO Box 643, Beijing 100044, China

Correspondence to: Fucheng Zhang1 Correspondence and requests for materials should be addressed to F.Z. (Email: zhangfucheng@ivpp.ac.cn).

Nature 455, 1105-1108 (23 October 2008) | doi:10.1038/nature07447; Received 14 June 2008; Accepted 19 September 2008

 

Abstract:

Recent coelurosaurian discoveries have greatly enriched our knowledge of the transition from dinosaurs to birds, but all reported taxa close to this transition are from relatively well known coelurosaurian groups1, 2, 3. Here we report a new basal avialan, Epidexipteryx hui gen. et sp. nov., from the Middle to Late Jurassic of Inner Mongolia, China. This new species is characterized by an unexpected combination of characters seen in several different theropod groups, particularly the Oviraptorosauria. Phylogenetic analysis shows it to be the sister taxon to Epidendrosaurus 4, 5, forming a new clade at the base of Avialae6. Epidexipteryx also possesses two pairs of elongate ribbon-like tail feathers, and its limbs lack contour feathers for flight. This finding shows that a member of the avialan lineage experimented with integumentary ornamentation as early as the Middle to Late Jurassic, and provides further evidence relating to this aspect of the transition from non-avian theropods to birds.

 

ottobre 23, 2008 Posted by | - R. Dinosauri, - Teropodi, 2 Jurassic / Giurassico, Asia, Bl - Top posts, Lang. - Italiano, P - Evoluzione, P - morfologia funzionale, P - Ritrovamenti fossili, Paleontology / Paleontologia | , , , , , , , , , , , | 1 commento

Epidexipteryx hui : le piume per “esibizionismo” e non per volare

vedi pure aggiornamento: 2008-10-23 – Epidexipteryx hui: le piume per “esibizionismo” e non per volare (2)

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First Dinosaur Feathers for Show, Not Flight?

Charles Q. Choi
for National Geographic News
September 29, 2008

The oldest known dinosaur relative of birds had “bizarre” anatomy, including long, ribbon-like tail feathers that suggest plumage may have first evolved for show rather than for flight, scientists say.

Farmers unearthed a fossil of the new dino species, dubbed Epidexipteryx hui, from the hills of Inner Mongolia in late 2007.
The remains date back 152 million to 168 million years ago, making the newfound creature slightly older than Archaeopteryx, the most primitive known bird.

(Related: “Earliest Bird Had Feet Like Dinosaur, Fossil Shows” [December 1, 2005].)

Like other avialans—birds and their closest dinosaur relatives—Epidexipteryx is a theropod, a group of two-legged animals that includes Tyrannosaurus rex.

A fossil of Epidexipteryx hui found in Mongolia shows long, ribbon-like tail feathers in addition to a body covered with shorter plumage.

A fossil of Epidexipteryx hui found in Mongolia shows long, ribbon-like tail feathers in addition to a body covered with shorter plumage.

Researchers think the pigeon-size Epidexipteryx might have used its plumes as flashy ornaments, since it was mostly covered in short feathers that lack the structure necessary for flight.

“For example, [the feathers] could potentially have played a role in displays intended to attract a mate, scare off a rival, or send a warning signal to other individuals of the same species,” said study co-author Fucheng Zhang, a paleontologist at the Chinese Academy of Sciences in Beijing.

“This is very exciting indeed, since it gives us a window into a stage of avialan history just preceding the appearance of the classic ‘first bird,'” Zhang said.

“It shows that the use of feathers for visual communication—as opposed to other functions such as insulation and flight—was a very early development.”

“Bizarre” Anatomy

Epidexipteryx lived in the mid- to late Jurassic period in a lush, well-vegetated area that was rich in salamanders and other possible prey.

The dinosaur had claws similar to those of ground-foraging birds, such as ostriches and turkeys, and its front teeth were large and protruding.

 

“One can certainly imagine [the teeth] being used to snatch at small prey, such as lizards, small mammals, or even insects,” Zhang said.

Strangely, Epidexipteryx’s anatomy seems to be a hodgepodge of features taken from a variety of animals.

For instance, its front limb bones and short, bony tail resemble those of living birds. But its short, high skull and large front teeth look like those of small theropods called oviraptors.

“It’s not uncommon for features present in one group to appear independently in another,” Zhang said of the newfound dino’s “bizarre” anatomy.

“It’s also typical for different parts of the body to evolve at different rates, so that some bits end up looking very specialized whereas others remain primitive.”

(See pictures of other “bizarre” dinosaurs.)

Zhang and his colleagues reported their findings last week in Nature Precedings, an online pre-publication service run by the journal Nature.

Evolution Experiments?

Luis Chiappe is a paleontologist with the Natural History Museum of Los Angeles County and a former National Geographic Society grantee. (National Geographic News is part of the National Geographic Society.)

He said that the mosaic of features suggests “there was a lot of evolutionary experimentation around the origin of birds, with many different kinds of lineages reaching different levels of ‘birdness.'”

But Chiappe, who was not involved in the new study, is skeptical of the idea that feathers originated as ornaments.

“Feathers could have served an aerodynamic function of some sort whether you fly or not. You could flap feathered wings and run faster,” he said.

“Still, these ornamental feathers are a really interesting new piece of evidence into why feathers first originated.”

SOURCES AND RELATED WEB SITES

http://news.nationalgeographic.com/news/2008/09/080929-bizarre-dinosaur.html
 

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settembre 30, 2008 Posted by | - R. Dinosauri, - Teropodi, 2 Jurassic / Giurassico, Articolo sc. di riferimento, Asia, Bl - Top posts, FREE ACCESS, Lang. - Italiano, P - Paleoetologia, P - Preservazione eccezionale, Paleontology / Paleontologia, Theropoda | , , , , , , , , , , , | 2 commenti