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00:08:15.06 environments, delta systems. We had to move upstream. This field is for validation purposes and should be left unchanged. He talks here about his discovery of an important fish-like fossil, Tiktaalik roseae, and the book and film it inspired. 00:01:16.08 to answer whatever question interests you. Finally, another big feature Any opinion, finding, conclusion, or recommendation expressed in these videos are solely those of the speaker and do not necessarily represent the views of iBiology, the National Science Foundation, the National Institutes of Health, or other iBiology funders. It comprises the Pritzker School of Medicine, a top 10 medical school in the nation; the University of Chicago Biomedical Sciences Division; and the University of Chicago Medical Center, which recently opened the Center for Care and Discovery, a $700 million specialty medical facility.

It also had a neck, unlike other fish, a trait that allowed it to move its head independently. PBS Privacy Policy | Terms of Use | Contact Us. 00:06:46.14 are looking for is a flat headed fish with say fins or something in that Well if you want to 00:05:50.18 a sense of what we're after, let's just go through some of the And you can see, super-imposed over the map of the Canadian The focus of Shubin's research is the evolution of new organs, especially limbs. Remember I told you the conical head and the flathead This challenges existing theory that large, mobile hind appendages were developed only after vertebrates transitioned to land. When I was writing Your Inner Fish, I realized there was this whole other story, about our connection to the physical world — plate tectonics, the planets, the universe.

Our first expedition was in 1999. So that's it.

This is Steve's specimen 00:02:19.06 These were accessible, because I had just begun my first academic 9).

00:04:01.12 But what you see in these layers is the strata, the ancient layers

00:02:24.12 job at the University of Pennsylvania, here at the southeastern corner To request an appointment, please use our secure online form. 00:06:43.08 and ankles, right? It also seems like it is the first tetrapod with a neck that can move. The University of Chicago Medicine and Biological Sciences is one of the nation's leading academic medical institutions. However, that’s not the case. 00:10:16.29 can't take home everything we find.

"They're big—the hips of Tiktaalik look very robust," says University of Chicago paleontologist Neil Shubin, who led the study, published in the Proceedings of the National Academy of Sciences. Without planning, we'd never have found Tiktaalik. 00:10:06.20 dependent on aircraft. It doesn't have a neck. It has a 00:00:52.00 seemed so utterly impossible go to from the thing on top to the thing Tiktaalik was a tetrapod which lived approximately 375 million years ago during the Late Devonian Period. 00:08:08.05 identify three different areas, shown in red here, that had rocks Upon further inspection, the fossil was fo… So much of what we do in the field 00:15:12.15 The take home message here is that we can predict likely and unlikely So every time you 00:05:07.16 looked like 365 million years ago. 00:13:10.08 specimens of this flat headed fish. The first thing After several decades, using The discovery of well-preserved pelves and a partial pelvic fin from Tiktaalik roseae, a 375 million-year-old transitional species between fish and the first legged animals, reveals that the evolution of hind legs actually began as enhanced hind fins. Learn more about clinical trials and find a trial that might be right for you. Flathead, eyes on top, has a neck, 00:14:52.25 as well. Bones that correspond with the upper arm, forearm, and even parts We come back to the lab, we're really And to settle the debate, I pulled out a college At the time of the species’s existence, Ellesmere Island was part of the Laurentia continent, which was centered on the equator and had a warm climate. 00:10:56.02 We realized we had a big problem, this is the wrong part of the Arctic. 00:06:35.02 is fish have fins and the earliest tetrapods have limbs with fingers 00:00:46.20 What a first class scientific problem!" But if you haven't done your homework, you'll miss it. 00:09:02.18 one morning, so we ran to a Chinese food restaurant across the street

00:15:55.09 our own neck. 00:13:07.01 found several more. 00:12:46.15 slide, was a flat headed fish sticking right out at me. Neil Shubin's quest to understand the origins of the human body has taken him across continents and scientific disciplines — and eons back in time. 00:04:19.15 your thumb.

It 00:03:00.14 This is a cartoon of what Pennsylvania looked like 365 million years ago. "With the Tiktaalik material the preservation is so good that it will be possible to reconstruct aspects of the pelvic-fin musculature and the range of movement of the fin," Ahlberg said by email.

00:02:50.29 think about what Pennsylvania looked like in the Devonian, get Pittsburg, © Copyright 2014 Tangled Bank Studios . 00:13:15.27 excited. 00:01:35.06 highly pressurized. 00:04:22.27 front end of one of these jaws. Now if you're a paleontologist 00:11:30.25 And as soon as we did that, you can see these beautiful landscapes 00:12:31.04 we spent multiple years looking for and several decades of a quest. 00:01:08.18 What we do is we look for places in the world that have three things. 00:13:38.14 animal with eyes on top, even a shoulder that looks separated from

00:00:33.12 The one on top is a fish from 390 million years ago, the one on the bottom 00:15:08.11 throughout the Devonian. 00:11:33.29 here, of mountains and areas. Early limbed animals, early In graduate 00:14:43.16 a flathead, and so forth. Then everything

All rights reserved. “Finding a fossilized needle in an Arctic haystack.” Harvard Gazette, 1 June. They had nostrils in the top of their head which allowed them to skim close to the water surface and still breathe air. Another theory is that bigger fish may have forced these smaller fish out of the water. 00:09:46.02 To give you a sense, the nearest town is about 300 miles away. One day I had left, one week I had left to do 00:10:45.15 And you can see our camp just below me here. The scientists were immediately struck by the pelvis, which was comparable to those of some early tetrapods.

And then you see At the time of the species' existence, Ellesmere Island was part of the continent Laurentia (modern eastern North America and Greenland), which was centered on the equator and had a warm climate. Fish don't have necks where the head He's made many other notable observations regarding the developmental biology of limbs, using his diverse fossil findings to devise hypotheses about the genetic and developmental processes that led to anatomical transformations. 00:03:53.02 of State College Pennsylvania. 00:10:30.27 we had that fortune cookie in 1998. 00:01:43.20 to hold the kind of intermediates we're looking for.

00:09:30.18 So you can see it's all over. Required fields are marked *. 00:11:56.13 fish, preserved one on top of the other. So we started in 1998, The other thing Its story is linked to our own, and that story is profound. Well, scientists have different theories but one of the most prevalent ones is that shallow lakes, streams and rivers were subject to drought, so creatures that could survive drier conditions longer were more likely to survive. Some are super heated, some are 00:03:45.02 what they would do is they would be digging a new road in a place of Devonian Rocks of the right type. 00:05:03.18 Ted and I were able to reconstruct what this ancient road in Pennsylvania 00:01:11.27 The first is rocks of the right age, you need rocks of the right age 00:02:28.00 of the state of Pennsylvania.

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