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:


(Date:2/26/2017)... , Feb. 25, 2017  Securus Technologies, ... technology solutions for public safety, investigation, corrections and ... Recidivism and Reentry. "Too often, too ... prisons and county jails are trying to tackle ... inmates and friends and family members. While significant steps ...
(Date:2/16/2017)... 16, 2017  Genos, a community for personal ... has received Laboratory Accreditation from the College of ... to laboratories that meet stringent requirements around quality, ... processes. "Genos is committed to maintaining ... We,re honored to be receiving CAP accreditation," said ...
(Date:2/9/2017)... -- The biomass boiler market report by Transparency Market ... globally in terms of revenue (US$ Mn) based on ... biomass boilers has been segmented on the basis of ... market based on feedstock type, has been segmented into ... crops, urban residues, and others. On the basis of ...
Breaking Biology News(10 mins):
(Date:3/22/2017)... (PRWEB) , ... March 22, 2017 , ... ... up human tissue regeneration from small lab samples to full-size tissues, bones, even ... to establish a vascular system that delivers blood deep into the developing tissue. ...
(Date:3/22/2017)... 2017  UBM and the Massachusetts Medical Device ... partnership and the third annual Massachusetts Medtech Week. Massachusetts ... st Annual MassMEDIC Conference held in conjunction ... 2017. MassMEDIC will feature a ... and CEO, Scott Whitaker , at its ...
(Date:3/22/2017)... , March 22, 2017 Oramed ... ( www.oramed.com ), a ... oral drug delivery systems, announced today that Dr. ... will deliver a presentation titled, "Oral Insulin for ... Cambridge Healthtech Institute,s Oligonucleotide and Peptide Therapeutics (OPT) ...
(Date:3/22/2017)... 22, 2017 The global chronic ... research report by Transparency Market Research (TMR). The top ... and AbbVie Inc., accounted for a share of only ... in this market are focusing aggressively on mergers, acquisitions, ... is likely to lead to market consolidation in the ...
Breaking Biology Technology:
Cached News: