HOME >> BIOLOGY >> NEWS
Coelacanth fossil sheds light on fin-to-limb evolution

A 400 million-year-old fossil of a coelacanth fin, the first finding of its kind, fills a shrinking evolutionary gap between fins and limbs. University of Chicago scientists describe the finding in a paper highlighted on the cover of the July/August 2007 issue of Evolution & Development.

The fossil shows that the ancestral pattern of lobed fins closely resembles the pattern in the fins of primitive living ray-finned fishes, according to the scientists.

This ends intense debate about the primitive pattern for lobed fins, which involves the ancestry of all limbs, including our own, said author Michael Coates, Ph.D., associate professor of organismal biology and anatomy at Chicago.

According to the researchers, the fossils pattern is similar to the branching arrangement still embedded in the fins of paddlefishes, sturgeons and sharks.

To understand the developmental evolution of the limbs of tetrapods [four-limbed vertebrates], we shouldnt be looking at the fins of our nearest living fish relativeslungfishes and coelacanthsbecause theyre far too specialized, Coates said.

Part of the reason why this is an interesting discovery is that people think of coelacanths animals as archetypal living fossils, said Matt Friedman, evolutionary biology graduate student at Chicago and lead author of the paper. But its a common misconception. If you look deep in the fossil record to the first members of that group, they are really different and very diverse.

Until now, many biologists have looked at lungfish as a primitive model of the evolution of tetrapods. Our fossil shows that what weve been using to define a primitive state is actually very specialized, Friedman said, which means it might give a deceptive view of what evolution was like for these fins skeletons.

If youre going to figure out how limbs evolved, you need to have a good idea about pre-conditions, Friedman said. You need to know what the
'"/>

Contact: Catherine Gianaro
catherine.gianaro@uchospitals.edu
773-702-6241
University of Chicago Medical Center
1-Aug-2007


Page: 1 2 3

Related biology news :

1. Agonized death throes probable cause of open-mouthed, head-back pose of many dino fossils
2. Brain, size and gender surprises in latest fossil tying humans, apes and monkeys
3. An ancient bathtub ring of mammoth fossils
4. Mystery of fossilized trees is solved
5. Microfossils unravel climate history of tropical Africa
6. Paleontologists to discuss gap fossils that link fish and land animals
7. Oldest animal fossils may have been bacteria
8. Scientists find lamprey a living fossil
9. Oldest complex organic molecules found in ancient fossils
10. West Australian fossil find rewrites land mammal evolution
11. Embryo fossils reveal animal complexity 10 million years before Cambrian Explosion

Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Coelacanth fossil sheds light fin limb evolution

(Date:11/4/2014)... School of Medicine announced today that it is ... by the Bill & Melinda Gates Foundation. ... and Reproductive Sciences; and Vice Chair of Research ... Medicine will pursue an innovative global health and ... Assess Fetal Neurodevelopment.", Grand Challenges Explorations (GCE) funds ...
(Date:11/4/2014)... VILNIUS, Lithuania , Nov. 4, 2014 /PRNewswire/ ... identification technologies, today announced that the latest version ... place in the Ongoing MINEX evaluation ... interoperability of fingerprint algorithms using the INCITS 378 ... a mandatory requirement in public tenders in ...
(Date:11/2/2014)... , James Dacey explores the ways in which physicists ... innovations from the lab into the commercial market. , ... companies as they move from prototype to product is ... physics-based inventions are usually far from market-ready when initially ... lot more complicated than had been originally thought. , ...
Breaking Biology News(10 mins):Temple University School of Medicine receives Grand Challenges Explorations grant 2Neurotechnology Places Second in Ongoing MINEX Ranking for Fingerprint Matching Algorithms 2Neurotechnology Places Second in Ongoing MINEX Ranking for Fingerprint Matching Algorithms 3The 'valley of death' facing physics start-ups 2
(Date:11/26/2014)... Texas (PRWEB) November 26, 2014 ... Industry is an in-depth research report on the ... the report introduces Palmitic Acid, basic information, including ... policy analysis, and news analysis, etc. , ... analyzes Palmitic Acid market in China ...
(Date:11/26/2014)... TOKYO , 25 novembre 2014 /PRNewswrie/ -- Theravalues ... per il mercato europeo in occasione di Hi Europe ... ). Si tratta della curcumina con ... tecnologia amorfa (senza cristalli) e ingredienti approvati dalle norme ... presente nella spezia della pianta curcumina ( Curcuma longa ...
(Date:11/24/2014)... , UAE, November 24, 2014 ... "Sheikh Hamdan Bin Rashid Al Maktoum Awards for Medical ... Dubai, United Arab Emirates , on ... ) , The Carter Center which ... Services is actively involved in numerous programs that aim ...
(Date:11/24/2014)...   First published ... Elsevier , a world-leading provider of scientific, technical ... the launch of the latest title in the Current ... Food Science . Current ... new platform to keep up-to-date with the expanding volume of ...
Breaking Biology Technology:Palmitic Acid Industry Global 2014 Analysis & 2020 Forecasts on Market data, Statics, Development Now at ReportsnReports.com 2Palmitic Acid Industry Global 2014 Analysis & 2020 Forecasts on Market data, Statics, Development Now at ReportsnReports.com 3La curcumina con la maggiore biodisponibilità di sempre farà il suo debutto in Europa 2La curcumina con la maggiore biodisponibilità di sempre farà il suo debutto in Europa 3Five US Winners Among Recipients of Hamdan Medical Awards 2Elsevier Announces Launch of New Journal: Current Opinion in Food Science 2Elsevier Announces Launch of New Journal: Current Opinion in Food Science 3
Cached News: