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:


(Date:3/29/2017)... March 29, 2017  higi, the health IT company ... North America , today announced a Series ... acquisition of EveryMove. The new investment and acquisition accelerates ... tools to transform population health activities through the collection ... higi collects and secures data today on ...
(Date:3/23/2017)... March 23, 2017 The report "Gesture Recognition and Touchless ... and Geography - Global Forecast to 2022", published by MarketsandMarkets, the market is ... of 29.63% between 2017 and 2022. Continue Reading ... ... ...
(Date:3/20/2017)... At this year,s CeBIT Chancellor Dr. Angela Merkel ... came to the DERMALOG stand together with the Japanese Prime Minster Shinzo ... At the largest German biometrics company the two government leaders could see ... as well as DERMALOG´s multi-biometrics system.   Continue ... ...
Breaking Biology News(10 mins):
(Date:4/20/2017)... ... 20, 2017 , ... USDM Life Sciences , the leading risk management, ... is pleased to announce Holger Braemer as Vice President of its Europe ... in Germany. , Braemer is an integral part of USDM’s expansion of services ...
(Date:4/20/2017)... ... ... Parallel6™ , the leader in mClinical™ technologies for improving patient enrollment, ... of the 2017 Top 10 eClinical Trial Management Solution Providers by Pharma Tech ... take pride in honoring Parallel6 as one of the top 10 companies that are ...
(Date:4/19/2017)... ... April 18, 2017 , ... The Vibrating Orifice Aerosol Generator ... generating monodisperse droplets of known diameters for research applications such as for calibrating ... by drying monodisperse droplets. , The VOAG requires forcing liquid out of ...
(Date:4/19/2017)... (PRWEB) , ... April 19, 2017 , ... ... $1.5M Series A-1 financing round. This event adds to several other early achievements ... its’ Executive and Scientific Teams. , ThermaGenix will use proceeds from ...
Breaking Biology Technology:
Cached News: