Dino Diner
Dino Diner
Het bewijs is eindelijk daar, Dinosauriers zijn niet uitgestorven door een meteoriet inslag we (zoogdieren) hebben ze gewoon opgegeten.
lees zelf maar helaas in het Engels. (bron CNN en Nature)
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DENVER, Colorado (AP) -- Villagers digging in China\'s rich fossil beds have uncovered the preserved remains of a tiny dinosaur in the belly of a mammal, a startling discovery for scientists who have long believed early mammals couldn\'t possibly attack and eat a dinosaur.
Scientists say the animal\'s last meal probably is the first proof that mammals hunted small dinosaurs some 130 million years ago. It contradicts conventional evolutionary theory that early mammals were timid, chipmunk-sized creatures that scurried in the looming shadow of the giant reptiles.
In this case, the mammal was about the size of a large cat, and the victim was a 5-inch \"parrot dinosaur.\"
A second mammal fossil found at the same site claims the distinction of being the largest early mammal ever found. It\'s about the size of a modern dog, a breathtaking 20 times larger than most mammals living in the early Cretaceous Period.
Considering the specimens in tandem, scientists suggest the period in which these animals lived may have been much different than is commonly understood as the Age of Dinosaurs, a time dominated by long-necked, 85-ton plant-eaters and the emergence of terrifying hunters with bladelike teeth and sickle claws.
It appears that at least some smaller dinosaurs had to look over their shoulders for snarling, meat-eating mammals claiming the same turf.
\"This new evidence gives us a drastically new picture,\" said paleontologist Meng Jin of the American Museum of Natural History in New York City, a co-author of the study in Thursday\'s issue of the journal Nature.
Other scientists who did not work on the bones described the discoveries as \"exhilarating.\"
\"This size range really has surprised everybody,\" said Zhexi Luo of the Carnegie Museum of Natural History in Pittsburgh, who digs in the same area of northeast China. \"It dispels the conventional wisdom.\"
The fossils were found more than two years ago in Liaoning province. The specimens were taken to a Beijing lab, where they were cleaned and analyzed by Chinese and American scientists.
The dinosaur-eater belongs to a species called Repenomamus robustus, known previously from skull fragments.
This squat, toothy specimen is more complete; lying on its side, it measures a little less than 2 feet (60 centimeters) long, and probably weighed about 15 pounds (7 kilos).
On R. robustus\' left side and under the ribs in the location of its stomach are the fragmented remains of a very young Psittacosaurus.
This common, fast-moving plant-eater is known as the \"parrot dinosaur\" because it had a small head with a curved, horny beak. Its arms were much shorter than its legs. Adults grew to be 6 feet (1.8 meters) long, but the one that was devoured was just 5 inches (13 centimeters).
The remains still are recognizable, indicating that R. robustus ripped its prey like a crocodile, but probably had not developed the ability to chew food like more advanced mammals.
\"We can still see articulated limb bones,\" Meng said. \"It must have swallowed food in large hunks without being chewed.\"
The larger, second fossil also is a Repenomamus, but considerably larger. It measures more than 3 feet (90 meters) long and probably weighed more than 30 pounds (13.6 kilos). Scientists have named it R. giganticus.
It weighed 20 times more than most of the 290 known early mammal species, Meng said. Its head is 50 percent larger than R. robustus and its body was larger than some dinosaurs living in the region.
Being so much larger means that R. giganticus probably behaved differently to most other early mammals, which ate insects and seeds. A larger mammal could roam and hunt aggressively, preying on young dinosaurs.
\"Giganticus is in a league by itself,\" Luo said. \"It\'s the world champion so far for body mass in any Mesozoic mammal.\"
This new class of predatory mammals has set off new speculation.
Originally, scientists believed that mammals remained small because larger dinosaurs were hunting them. Only after dinosaurs went extinct by 65 million years ago did surviving mammals begin to grow larger, they reasoned.
Now, the presence of larger mammals is reversing some of the speculation. The Liaoning region already is famous for its trove of small feathered dinosaurs and early birds.
\"Maybe small dinosaurs got larger or got off the ground to avoid rapacious mammals,\" wonders Duke University paleontologist Anne Weil.
Equally mysterious is how these specimens died in the same area at the same time. Neither shows evidence of being hunted itself.
The Yixian rock formation in which their bones were encased was a combination of river sediments and volcanic ash called tuff. The formation also includes the fossils of insects, frogs and other creatures, suggesting a mass die-off.
\"It\'s possible that poisonous volcanic gas killed the animals when they were sleeping,\" Meng said. \"Then there was a catastrophic explosion that buried the whole thing.\"
[Bewerkt door The Stone op 14-01-2005 om 08:38 NL]
lees zelf maar helaas in het Engels. (bron CNN en Nature)
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DENVER, Colorado (AP) -- Villagers digging in China\'s rich fossil beds have uncovered the preserved remains of a tiny dinosaur in the belly of a mammal, a startling discovery for scientists who have long believed early mammals couldn\'t possibly attack and eat a dinosaur.
Scientists say the animal\'s last meal probably is the first proof that mammals hunted small dinosaurs some 130 million years ago. It contradicts conventional evolutionary theory that early mammals were timid, chipmunk-sized creatures that scurried in the looming shadow of the giant reptiles.
In this case, the mammal was about the size of a large cat, and the victim was a 5-inch \"parrot dinosaur.\"
A second mammal fossil found at the same site claims the distinction of being the largest early mammal ever found. It\'s about the size of a modern dog, a breathtaking 20 times larger than most mammals living in the early Cretaceous Period.
Considering the specimens in tandem, scientists suggest the period in which these animals lived may have been much different than is commonly understood as the Age of Dinosaurs, a time dominated by long-necked, 85-ton plant-eaters and the emergence of terrifying hunters with bladelike teeth and sickle claws.
It appears that at least some smaller dinosaurs had to look over their shoulders for snarling, meat-eating mammals claiming the same turf.
\"This new evidence gives us a drastically new picture,\" said paleontologist Meng Jin of the American Museum of Natural History in New York City, a co-author of the study in Thursday\'s issue of the journal Nature.
Other scientists who did not work on the bones described the discoveries as \"exhilarating.\"
\"This size range really has surprised everybody,\" said Zhexi Luo of the Carnegie Museum of Natural History in Pittsburgh, who digs in the same area of northeast China. \"It dispels the conventional wisdom.\"
The fossils were found more than two years ago in Liaoning province. The specimens were taken to a Beijing lab, where they were cleaned and analyzed by Chinese and American scientists.
The dinosaur-eater belongs to a species called Repenomamus robustus, known previously from skull fragments.
This squat, toothy specimen is more complete; lying on its side, it measures a little less than 2 feet (60 centimeters) long, and probably weighed about 15 pounds (7 kilos).
On R. robustus\' left side and under the ribs in the location of its stomach are the fragmented remains of a very young Psittacosaurus.
This common, fast-moving plant-eater is known as the \"parrot dinosaur\" because it had a small head with a curved, horny beak. Its arms were much shorter than its legs. Adults grew to be 6 feet (1.8 meters) long, but the one that was devoured was just 5 inches (13 centimeters).
The remains still are recognizable, indicating that R. robustus ripped its prey like a crocodile, but probably had not developed the ability to chew food like more advanced mammals.
\"We can still see articulated limb bones,\" Meng said. \"It must have swallowed food in large hunks without being chewed.\"
The larger, second fossil also is a Repenomamus, but considerably larger. It measures more than 3 feet (90 meters) long and probably weighed more than 30 pounds (13.6 kilos). Scientists have named it R. giganticus.
It weighed 20 times more than most of the 290 known early mammal species, Meng said. Its head is 50 percent larger than R. robustus and its body was larger than some dinosaurs living in the region.
Being so much larger means that R. giganticus probably behaved differently to most other early mammals, which ate insects and seeds. A larger mammal could roam and hunt aggressively, preying on young dinosaurs.
\"Giganticus is in a league by itself,\" Luo said. \"It\'s the world champion so far for body mass in any Mesozoic mammal.\"
This new class of predatory mammals has set off new speculation.
Originally, scientists believed that mammals remained small because larger dinosaurs were hunting them. Only after dinosaurs went extinct by 65 million years ago did surviving mammals begin to grow larger, they reasoned.
Now, the presence of larger mammals is reversing some of the speculation. The Liaoning region already is famous for its trove of small feathered dinosaurs and early birds.
\"Maybe small dinosaurs got larger or got off the ground to avoid rapacious mammals,\" wonders Duke University paleontologist Anne Weil.
Equally mysterious is how these specimens died in the same area at the same time. Neither shows evidence of being hunted itself.
The Yixian rock formation in which their bones were encased was a combination of river sediments and volcanic ash called tuff. The formation also includes the fossils of insects, frogs and other creatures, suggesting a mass die-off.
\"It\'s possible that poisonous volcanic gas killed the animals when they were sleeping,\" Meng said. \"Then there was a catastrophic explosion that buried the whole thing.\"
[Bewerkt door The Stone op 14-01-2005 om 08:38 NL]
When you have eliminated the impossible, that which remains, however improbable, must be the truth.
Once you've got heat, you can do everything!
Once you've got heat, you can do everything!
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Frederik
- Administrator
- Berichten: 8668
- Lid geworden op: 28 sep 2003, 20:33
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Antw: Dino Diner
90 meter vind ik wat overdrevenIt measures more than 3 feet (90 meters)
Wel een zeer interessante vondst!
Try to learn something about everything and everything about
something (TH Huxley)
something (TH Huxley)
Antw: Dino Diner
Dit is het abstract uit Nature. Als iemand het hele artikel wil (PDF) kan ik het je sturen.
Mesozoic mammals are commonly portrayed as shrew- or rat-sized animals that were mainly insectivorous, probably nocturnal and lived in the shadow of dinosaurs. The largest known Mesozoic mammal represented by substantially complete remains is Repenomamus robustus, a triconodont mammal from the Lower Cretaceous of Liaoning, China. An adult individual of R. robustus was the size of a Virginia opossum. Here we report a new species of the genus, represented by a skeleton with most of the skull and postcranium preserved in articulation. The new species is 50% larger than R. robustus in skull length. In addition, stomach contents associated with a skeleton of R. robustus reveal remains of a juvenile Psittacosaurus, a ceratopsian dinosaur. Our discoveries constitute the first direct evidence that some triconodont mammals were carnivorous and fed on small vertebrates, including young dinosaurs, and also show that Mesozoic mammals had a much greater range of body sizes than previously known. We suggest that Mesozoic mammals occupied diverse niches and that some large mammals probably competed with dinosaurs for food and territory.
\"I have called this principle, by which each slight variation, if useful, is preserved, by the term Natural Selection\" - Charles Darwin
Antw: Dino Diner
Frederic, ik denk dat je je een beetje mistelt hebt...
1 feet is ongeveer 30 CM....
3 feet komt dus overeen met iets meer dan 90 CM...
Greetz, Bert
1 feet is ongeveer 30 CM....
3 feet komt dus overeen met iets meer dan 90 CM...
Greetz, Bert
Greetz, Bert
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Smaug
- Community Manager
- Berichten: 1416
- Lid geworden op: 11 nov 2003, 17:14
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Antw: Dino Diner
Waarschijnlijk heeft hij het ook alleen maar gecopy-pasted van CNN.
My armour is like tenfold shields, my teeth are
swords, my claws spears, the shock of my tail
is a thunderbolt, my wings a hurricane, and my
breath death!
swords, my claws spears, the shock of my tail
is a thunderbolt, my wings a hurricane, and my
breath death!
-
Frederik
- Administrator
- Berichten: 8668
- Lid geworden op: 28 sep 2003, 20:33
- Has thanked: 9 times
- Been thanked: 47 times
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Antw: Antw: Dino Diner
Bert, ik denk dat de CNN zich een beetje mistelde toen ze schreven dat 3 voet gelijk is aan 90 meter, want zo staat het in het artikel.bert schreef:
Frederic, ik denk dat je je een beetje mistelt hebt...
1 feet is ongeveer 30 CM....
3 feet komt dus overeen met iets meer dan 90 CM...
Greetz, Bert
(natuurlijk een typfout, maar ik vond het wel grappig)
Try to learn something about everything and everything about
something (TH Huxley)
something (TH Huxley)
Antw: Dino Diner
voor de mensen met een fantastisch engels er is in de telegraaf ook een artikel over deze zoogdieren verschenen(met plaatje!)
Antw: Dino Diner
ik heb ook een artikeltje gezien, 16 cm2!!!!
daar ga ik maar eens een middagje voor zitten
Groeten, Casper
daar ga ik maar eens een middagje voor zitten
Groeten, Casper
Post mortem we sort 'em!
Antw: Dino Diner
het artikel in de telegraaf is minstens 150 vierkante cm dat kost wel een dagje of 3
Antw: Dino Diner
In this case, the mammal was about the size of a large cat, and the victim was a 5-inch \"parrot dinosaur.\"
A second mammal fossil found at the same site claims the distinction of being the largest early mammal ever found. It\'s about the size of a modern dog, a breathtaking 20 times larger than most mammals living in the early Cretaceous Period.
dus de een is zo groot als een grote kat?
dat kan dus een flinke huiskat zijn of een
grote tijger???
en dan de grootste net zo groot als een moderne hond?
dat kan dan een chi chu zijn of een mastif
ofte wel een cavia of een ponny???
U begrijpt wel dat ik het af en toe ook niet meer snap,zo kan je nog alle kanten op.
best wel lastig die buitenlandse berichten.
gr dv
A second mammal fossil found at the same site claims the distinction of being the largest early mammal ever found. It\'s about the size of a modern dog, a breathtaking 20 times larger than most mammals living in the early Cretaceous Period.
dus de een is zo groot als een grote kat?
dat kan dus een flinke huiskat zijn of een
grote tijger???
en dan de grootste net zo groot als een moderne hond?
dat kan dan een chi chu zijn of een mastif
ofte wel een cavia of een ponny???
U begrijpt wel dat ik het af en toe ook niet meer snap,zo kan je nog alle kanten op.
best wel lastig die buitenlandse berichten.
gr dv
i just looove fossils