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The fish that crawled out of the water: A newly found fossil links fish to land-lubbers
nature.com/news ^ | 5 April 2006 | Rex Dalton

Posted on 04/07/2006 3:22:37 AM PDT by S0122017

Published online: 5 April 2006; | doi:10.1038/news060403-7 The fish that crawled out of the water A newly found fossil links fish to land-lubbers. Rex Dalton

The fossilized remains of Tiktaalik show a crocodile-like creature with joints in its front arms. credit Ted Daeschler

A crucial fossil that shows how animals crawled out from the water, evolving from fish into land-loving animals, has been found in Canada.

The creature, described today in Nature1,2, lived some 375 million years ago. Palaeontologists are calling the specimen from the Devonian a true 'missing link', as it helps to fill in a gap in our understanding of how fish developed legs for land mobility, before eventually evolving into modern animals including mankind.

Several samples of the fish-like tetrapod, named Tiktaalik roseae, were discovered by Edward Daeschler of the Academy of Natural Sciences in Philadelphia, Pennsylvania, Neil Shubin of the University of Chicago in Illinois, Farish Jenkins of Harvard University in Cambridge, Massachusetts and colleagues.

"Tetrapods did not so much conquer the land, as escape from the water." John Maisey American Museum of Natural History, New York

The crew found the samples in a river delta on Ellesmere Island in Arctic Canada; these included a near-complete front half of a fossilized skeleton of a crocodile-like creature, whose skull is some 20 centimetres long.

The beast has bony scales and fins, but the front fins are on their way to becoming limbs; they have the internal skeletal structure of an arm, including elbows and wrists, but with fins instead of clear fingers. The team is still looking for more complete specimens to get a better picture of hind part of the animal.

Plugging the gap

The new find helps to fill a gap in the record of how fish evolved into land-loving animals. credit Kalliopi Monoyios

Creatures with features of both fish and land-living animals have been found before. Fish that may have been beginning to 'walk' in shallow water have been found from about 385 million years ago, and fish with limbs that bear digits have been seen from more than 365 million years ago.

Specimens that fall into the gap, such as Tiktaalik, help researchers to work out the details of this transition. The newly found animal has a structure on its head that looks like a small gill slit that is on its way to becoming an ear, for example, and a long snout that would have been suited to catching prey on land.

"Tiktaalik substantially narrows the gap in the fossil record of the fish-tetrapod transition," says Per Ahlberg of Uppsala University in Sweden.

"Tiktaalik was probably an unwieldy swimmer," says John Maisey, a palaeontologist at the American Museum of Natural History in New York. It probably lived in shallow waters, says Maisey, only hauling itself on to land temporarily to escape predators. "Tetrapods did not so much conquer the land, as escape from the water," he says.

The crew picks over rocks and bones despite the dismal weather.

Daeschler and Shubin set off to find this missing link in the evolutionary chain back in 1999. The pair targeted Ellesmere Island after noticing that it was listed in an undergraduate textbook as exposed Devonian rock that had not previously been explored for vertebrate fossils.

The desolate area was reachable only by plane, and the weather was so bad that field work could only be done for about two months each summer. The team first walked around the rocky outcrops looking for fossils of plant life that indicated stream or delta sediments, in order to target areas that had once hosted shallow waters. "That is where the action is on the fish-to-tetrapod transition," says Daeschler.

By 2000 they had found fossils with intriguing fins in the eroding rocks. "In 2004, we really scored, finding three partial skulls and numerous jaws," recalls Daeschler.

Shubin remembers finding one simply by wandering off to sit on a rock for his lunch break. "I looked over at a wall; there was a Tiktaalik snout looking out of the cliff at me. I couldn't believe my eyes. I knew the rest of the skeleton was behind it. We were high fiving right and left."

Visit our newsblog to read and post comments about this story.


TOPICS: Heated Discussion
KEYWORDS: evolution; science
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Steven would love it!
1 posted on 04/07/2006 3:22:38 AM PDT by S0122017
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To: pcottraux

Not really cryptozoology. But maybe you can include weird and special animals in your list?


2 posted on 04/07/2006 3:23:47 AM PDT by S0122017 (God created the aliens which guided evolution which produced the human race and that's the Truth.)
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To: PatrickHenry

ping!


3 posted on 04/07/2006 3:35:15 AM PDT by Vaquero ("An armed society is a polite society" Robert A. Heinlein)
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To: Vaquero
We had an earlier thread on this subject matter: Newly found species fills evolutionary gap between fish and land animals, but it's overloaded. And this is a fresh article about an important news item. I'm gonna ping the list.
4 posted on 04/07/2006 3:48:22 AM PDT by PatrickHenry (Yo momma's so fat she's got a Schwarzschild radius.)
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To: VadeRetro; Junior; longshadow; RadioAstronomer; Doctor Stochastic; js1138; Shryke; RightWhale; ...
Evolution Ping

The List-O-Links
A conservative, pro-evolution science list, now with over 360 names.
See the list's explanation, then FReepmail to be added or dropped.
To assist beginners: But it's "just a theory", Evo-Troll's Toolkit,
and How to argue against a scientific theory.

5 posted on 04/07/2006 3:49:51 AM PDT by PatrickHenry (Yo momma's so fat she's got a Schwarzschild radius.)
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Comment #6 Removed by Moderator

To: S0122017

What if they found a regular land species with genetic defects of the limbs?


7 posted on 04/07/2006 3:58:53 AM PDT by MedicalMess
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To: S0122017
The newly found animal has a structure on its head that looks like a small gill slit that is on its way to becoming an ear

Sometimes I feel that my ears are on their way to becoming gill slits. But that's only after I take the orange pills.

8 posted on 04/07/2006 4:01:14 AM PDT by ClearCase_guy (Never question Bruce Dickinson!)
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To: S0122017
Just another extinct species. No big deal. No "missing link" here. Surely we're not back to the hoax of man evolving from fish - LOL!!!
9 posted on 04/07/2006 4:04:20 AM PDT by nmh (Intelligent people recognize Intelligent Design (God) !)
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To: jasoncann

Yes, but that don't trouble Darwin's pet ortho-doxies.


10 posted on 04/07/2006 4:04:31 AM PDT by bvw
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To: bvw

"Yes, but that don't trouble Darwin's pet ortho-doxies."

Otherwise known and the Church of Darwin.

Darwin was a young man running away from Daddy. He spent a whole 30 days writing the bible these people use.

This is like the TV show house. The find a piece of bone the size of a quarter and before long they have reconstructed the persons entire body, identified the brand name of the tool that killed them, and even their favorite food.

Hogwash.


11 posted on 04/07/2006 4:19:43 AM PDT by driftdiver
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To: driftdiver

Considering the location this creature was discovered it does tell us that there was a time when ice did not cover that landscape.


12 posted on 04/07/2006 4:28:39 AM PDT by Just mythoughts
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To: Just mythoughts

I screwed up on my TV show comparison, I meant the show Bones. House is similiar though. They are good for entertainment value IMO.

" it does tell us that there was a time when ice did not cover that landscape."

Or the thing crawled outta the water and froze to death due to the ice.


13 posted on 04/07/2006 4:49:11 AM PDT by driftdiver
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To: S0122017
Fish with hand-like fins? Nothing new, they've been hawking "chicken of the sea" for years.


14 posted on 04/07/2006 4:52:50 AM PDT by SirJohnBarleycorn
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an important news item.




Yeah right!!!


15 posted on 04/07/2006 4:55:04 AM PDT by WKB (Science Fiction= Any science that omits God.)
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To: driftdiver
"Or the thing crawled outta the water and froze to death due to the ice."

IF this creature was water and land living creature then it most likely died out due the area getting a "quick" freeze.

I think considering what else has been found in the nearly completely frozen geographical areas that these areas were not created in that state but became that way.
16 posted on 04/07/2006 5:03:03 AM PDT by Just mythoughts
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To: Just mythoughts

" IF this creature was water and land living creature then it most likely died out due the area getting a "quick" freeze."

Other than my religion the biggest reason I won't buy these kinds of "discoveries" is based on two major things. 1) the agenda of the discoverer is to prove what they already believe so they interpret or twist the data accordingly. 2) there are so many assumptions and "educated" guesses made that if each one has a generous 25% chance of being correct the end percentage is incredibly small.


17 posted on 04/07/2006 5:16:50 AM PDT by driftdiver
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To: driftdiver

"Other than my religion the biggest reason I won't buy these kinds of "discoveries" is based on two major things. 1) the agenda of the discoverer is to prove what they already believe so they interpret or twist the data accordingly. 2) there are so many assumptions and "educated" guesses made that if each one has a generous 25% chance of being correct the end percentage is incredibly small."


The Bible does not specifically date this earth, rather it describes events that make it very very very old. What can be approximately dated is the time in which man in the flesh was place upon this earth and some of the creatures created at the same time.

Genesis does not describe when the souls were created, it says that it was placement of the soul in the flesh made the flesh a living being. Evolutionists are obsessed with flesh and their excuse for a need of transitional flesh is cause they have no scientific method of testing the "soul".

The oldness of this creature is not in conflict with what the Bible says, Peter describes three different world ages.

Isaiah 45:18 For thus saith the LORD That created the heavens; God Himself That formed the earth and made it; He hath established it, He created it not in vain, He formed it to be inhabited: "I am the LORD: and there is none else.

So Genesis 1:2 is describing an event that cause this earth to become without form = waste, void, and ...'darkness' = which is respesentative of the evil one.

We are told in Ezekiel 28 that Satan was in the Garden of Eden and Genesis does not describe him as part of the creation, he is call the tree of the knowledge of good and evil. So evolution by their own admission can not distinguish between good and evil as they have no ability to test the "supernatural", which means things their flesh eyes are blind to.


18 posted on 04/07/2006 5:57:26 AM PDT by Just mythoughts
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To: PatrickHenry
Actually, that head really does resemble Acanthostega and Ichthyostega, the Devonian amphibians before whom it fills a gap.


19 posted on 04/07/2006 6:53:20 AM PDT by VadeRetro (I have the updated "Your brain on creationism" on my homepage.)
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To: Just mythoughts
It was on the equator back in the Devonian. Plate tectonics and all that.
20 posted on 04/07/2006 6:54:30 AM PDT by VadeRetro (I have the updated "Your brain on creationism" on my homepage.)
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