HOME >> BIOLOGY >> NEWS
Fossil discovery marks earliest record of limbloss in ancient lizard

ample of paleontological data being used to elucidate the potential molecular genetic causes of a major evolutionary transition, said Dr. Martin Cohn, from the Department of Zoology and University of Florida Genetics Institute.

"This is a terrifically important discovery because it shows, in a group of animals thought to be closely related to snakes, that forelimb reduction and trunk elongation were well underway before the onset of hindlimb reduction," said Cohn. "By uncovering the sequence of the morphological changes that occurred during evolution of a snake-like body plan, Palci and Caldwell's study provides important clues as to which developmental mechanisms could have been involved."

The researchers think this snake-like lizard was about 10 to 12 inches long, had a small head perched on an elongated neck, body and tail and relatively large and well-developed rear limbs. All bones of the forearm, including the hands and digits were not formed during development.

"For some oddball reason the forelimbs were lost before the rear limbs when you would think it would be the opposite," said Caldwell. "The front limbs would be useful for holding onto dinner or digging a hole but it must be developmentally easier to get rid of the forelimbs."

The most well known ancient fossil snakes also kept their hind limbs. Living lizards also show almost every variation in limb reduction from a perfectly formed back limb with no forelimb, or a spike for a forelimb and one or two toes on the rearlimb, to total limblessness. This degree of variation makes it very difficult to understand the pattern of evolutionary limb loss in these animals.

"This discovery is one more data point that might help us answer some questions and perhaps shed some light on the fin to limb transition, which is a key step in the evolution of land animals," said Caldwell. "It doesn't give us all the answers but it's a start."


'"/>

Contact: Phoebe Dey
phoebe.dey@ualberta.ca
780-492-0437
University of Alberta
22-Mar-2007


Page: 1 2 3

Related biology news :

1. Fossil DNA illuminates life
2. Fossils of ancient sea monster found in Montana
3. Fossil is missing link in elephant lineage
4. Fossilized liquid assembly: Nanomaterials research tool
5. Fossils pinpoint tropics as Earths most fruitful biodiversity spawning ground
6. Early bird caught the fish: Fossils depict aquatic origins of birds 115 million years ago
7. Fossil wood gives vital clues to ancient climates
8. Fossils tell the hole story of killer drillers and their prey
9. Fossil Patagonian plants show high insect feeding diversity 52 million years ago
10. Fossil records show biodiversity comes and goes
11. Enzyme discovery sheds light on vitamin D

Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Fossil discovery marks earliest record limbloss ancient lizard

(Date:7/28/2014)... Eight of the top 10 U.S. cities that have ... public inconveniences as frequent road closures, overwhelmed storm drains ... a new NOAA technical report. , This nuisance flooding, ... three U.S. coasts, between 300 and 925 percent since ... Nuisance Flood Frequency Changes around the United States, also ...
(Date:7/28/2014)... There is no cure for Alzheimer,s disease and other ... step closer to finding treatment. , University of Washington ... stop the harmful changes of the body,s normal proteins ... as Alzheimer,s, Parkinson,s, heart disease, Type 2 diabetes and ... as they shift from their normal state into an ...
(Date:7/28/2014)... of a new study suggest two ways to effectively address ... well in obese women, compared to women of a normal ... method, researchers say, but as the population has increased in ... for obese women. Studies have consistently found that obesity has ... may in turn affect how well the pill prevents pregnancy. ...
Breaking Biology News(10 mins):NOAA: 'Nuisance flooding' an increasing problem as coastal sea levels rise 2NOAA: 'Nuisance flooding' an increasing problem as coastal sea levels rise 3New protein structure could help treat Alzheimer's, related diseases 2New protein structure could help treat Alzheimer's, related diseases 3Strategies identified to improve oral contraceptive success with obese women 2
(Date:7/28/2014)... 2014 Sapphire Energy, Inc. , a ... appointment of biotechnology veteran James Levine as ... Levine replaces Cynthia ,CJ, Warner, who is stepping down ... of the company,s board of directors. "The ... deliver commercial scale algae-based fuels has been tremendous, from ...
(Date:7/28/2014)... VA (PRWEB) July 28, 2014 The ... nonprofit authority on the use of health IT to ... Health Plan Identifier (HPID) Workgroup has developed ... a Health Plan and Payer?” The HPID Workgroup, a ... closely with the Centers for Medicare and Medicaid Services ...
(Date:7/28/2014)... July 28, 2014 “2014 ... Lubricant Industry” is a professional and in-depth ... market. The report introduces Lubricant basic information, ... chain structure and industry overview. This research ... domestic market as well as global industry ...
(Date:7/28/2014)... According to a new market research report ... and Joint) Market (By Technology - Stem Cell ... Bone Graft Substitutes, Osteoarticular Diseases, Allogeneic Products, Autogenic ... Share, Growth, Trends and Forecast, 2013 - 2019" ... was valued at USD 2.6 billion in 2012 ...
Breaking Biology Technology:Sapphire Energy Announces New CEO James Levine 2Sapphire Energy Announces New CEO James Levine 3WEDI’s HPID Workgroup Announces Release of Issue Brief: “What is the Difference Between a Health Plan and Payer?” 2Lubricant Market & Adhesion Promoter Industry (Globa, China) Analysis Now Available at DeepResearchReports.com 2Lubricant Market & Adhesion Promoter Industry (Globa, China) Analysis Now Available at DeepResearchReports.com 3Lubricant Market & Adhesion Promoter Industry (Globa, China) Analysis Now Available at DeepResearchReports.com 4Regenerative Medicine Market: Global Industry Analysis, Size, Share, Growth, Trends and Forecast 2013 - 2019 2Regenerative Medicine Market: Global Industry Analysis, Size, Share, Growth, Trends and Forecast 2013 - 2019 3Regenerative Medicine Market: Global Industry Analysis, Size, Share, Growth, Trends and Forecast 2013 - 2019 4
Cached News: