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:4/14/2015)... 14, 2015 NXT-ID, Inc. (NASDAQ: NXTD ... focused on the growing mobile commerce market, announces that ... 2015 New York Design Awards under the category  ,Product ... City Design Awards are part of a global multi-disciplinary ... ratings from the marketplace, industry and judging panel. Winners ...
(Date:4/9/2015)... SAN JOSE, Calif. , April 9, 2015 /PRNewswire/ ... of human interface solutions, announced today that it will ... 2015 on Thursday, April 23, 2015, after the close ... call for analysts and investors at 2:00 p.m. PT ... information.    To participate on the live ...
(Date:4/2/2015)... April 2, 2015 At its 2015 ACMG ... City , the American College of Medical Genetics ... directors to its Board.  Members of the ACMG Board ... for forming and advancing its policies and programs. ACMG ... "It,s an eventful time in medical genetics ...
Breaking Biology News(10 mins):NXT-ID's Wocket Smart Wallet Nominated for 2015 New York Design Awards in 'Product Design- Technology' 2NXT-ID's Wocket Smart Wallet Nominated for 2015 New York Design Awards in 'Product Design- Technology' 3Synaptics to Report Third Quarter Results on April 23 2American College of Medical Genetics and Genomics Announces New Board Members: Dr. Louanne Hudgins is ACMG President-Elect 2American College of Medical Genetics and Genomics Announces New Board Members: Dr. Louanne Hudgins is ACMG President-Elect 3American College of Medical Genetics and Genomics Announces New Board Members: Dr. Louanne Hudgins is ACMG President-Elect 4American College of Medical Genetics and Genomics Announces New Board Members: Dr. Louanne Hudgins is ACMG President-Elect 5American College of Medical Genetics and Genomics Announces New Board Members: Dr. Louanne Hudgins is ACMG President-Elect 6American College of Medical Genetics and Genomics Announces New Board Members: Dr. Louanne Hudgins is ACMG President-Elect 7American College of Medical Genetics and Genomics Announces New Board Members: Dr. Louanne Hudgins is ACMG President-Elect 8
(Date:4/16/2015)... (PRWEB) April 16, 2015 A new ... it easier for research institutions to learn how Appleā€™s ... data. , The timing is ideal since Apple made ... Research Kit is an open-source framework for developing medical ... provides a way for researchers to collect secure clinical ...
(Date:4/16/2015)... SAN DIEGO , April 16, 2015 ... company dedicated to improving cancer surgeries, announced today that ... lead fluorescent cancer illuminator, AVB-620, in women with primary, ... trial, the company also welcomed the addition of ... affairs. The open label, dose escalation study ...
(Date:4/16/2015)... and MENLO PARK, Calif. , April ... DMPI) (DelMar and the Company), a biopharmaceutical company focused ... orphan drug indications, today announced that the Mayo ... clinical trial site for the ongoing, multicenter Phase I/II ... (GBM), the most common and deadly form of human ...
(Date:4/16/2015)... Seattle, Washington (PRWEB) April 16, 2015 ... for Applied Cancer Science and Resolution Bioscience, Inc. ... agreement to co-develop a novel, blood-based, clinic ready, ... lung cancer (NSCLC). The collaboration is the first ... ALK, RET, and ROS1 fusions in blinded plasma ...
Breaking Biology Technology:Infographic Illustrates Potential for Research Kit to Impact Clinical Research 2Infographic Illustrates Potential for Research Kit to Impact Clinical Research 3Avelas Biosciences Initiates Phase 1b Trial of AVB-620 in Breast Cancer Patients 2Avelas Biosciences Initiates Phase 1b Trial of AVB-620 in Breast Cancer Patients 3DelMar Pharmaceuticals Adds Fourth Clinical Trial Site in Phase I/II Multicenter Study of VAL-083 for Recurrent Malignant Glioma 2DelMar Pharmaceuticals Adds Fourth Clinical Trial Site in Phase I/II Multicenter Study of VAL-083 for Recurrent Malignant Glioma 3DelMar Pharmaceuticals Adds Fourth Clinical Trial Site in Phase I/II Multicenter Study of VAL-083 for Recurrent Malignant Glioma 4DelMar Pharmaceuticals Adds Fourth Clinical Trial Site in Phase I/II Multicenter Study of VAL-083 for Recurrent Malignant Glioma 5Resolution Bioscience announces successful collaboration on a novel, non-invasive, targeted NGS test for lung cancer 2Resolution Bioscience announces successful collaboration on a novel, non-invasive, targeted NGS test for lung cancer 3
Cached News: