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Latest Tetrapod Stories

New Fish Fossil Reveals How Fins May Have Become Hind Limbs
2014-01-14 06:11:22

[ Watch the video: Tiktaalik roseae fossils reveal evolution of hind limbs ] April Flowers for redOrbit.com - Your Universe Online The evolution of hind legs actually began as enhanced hind fins, according to the newly discovered, well-preserved pelvis and a partial pelvic fin from Tiktaalik roseae—a 375 million-year old transitional species between fish and the first legged animals. The findings, published in Proceedings of the National Academy of Sciences (PNAS), challenge the...

The Land Invasion Race: The Evolution Of Fins To Limbs
2013-07-07 19:51:23

Society for Experimental Biology Why did animals with limbs win the race to invade land over those with fins? A new study comparing the forces acting on fins of mudskipper fish and on the forelimbs of tiger salamanders can now be used to analyze early fossils that spanned the water-to-land transition in tetrapod evolution, and further understand their capability to move on land. Research conducted by Sandy Kawano and Richard Blob at Clemson University compared terrestrial locomotion in...

Evolution Of Hips Simpler Than Suspected
2013-05-15 12:04:37

April Flowers for redOrbit.com - Your Universe Online The evolutionary path from the bone structure of the fish to the complex, weight-bearing hips of walking animals was a much simpler process than previously thought, according to a new study. About 395 million years ago, the first tetrapods, or four-legged animals, stepped onto land. This transition was accomplished using strong, weight-bearing hipbones and a connection through the spine via the ilium. These features were not present...

Genome Of The Coelacanth Sequenced
2013-04-18 05:26:08

April Flowers for redOrbit.com - Your Universe Online The genome of the coelacanth, a creature with an evolutionary history that is both enigmatic and illuminating, has been decoded by the Genome Center of the Broad Institute of MIT and Harvard, and analyzed by an international team of researchers. The findings of this study are published in the journal Nature. The coelacanth, a sea-cave dwelling, five-foot long fish with limb-like fins, was once thought to be extinct until a living...

Ancient Fossils Of Tough Fish Shed Light On Evolution Of Four-Footed Animals
2013-03-28 08:08:22

April Flowers for redOrbit.com - Your Universe Online Describing life in the Devonian period in what is now northern Canada, Dr. Ted Daeschler of Drexel University said, "We call it a 'fish-eat-fish world,' an ecosystem where you really needed to escape predation.” The famous fossil fish species Tiktaalik roseae lived in this environment 375 million years ago. Daeschler, associate professor at Drexel University in the Department of Biodiversity, Earth and Environmental Science,...

Aquatic Eel Fossil Has Human-like Spine Morphology
2012-05-23 04:48:16

Surprise discovery contradicts theories about anatomy exclusive to land animals For decades, scientists believed that a spine with multiple segments was an exclusive feature of land-dwelling animals. But the discovery of the same anatomical feature in a 345-million-year-old eel suggests that this complex anatomy arose separately from — and perhaps before — the first species to walk on land. Tarrasius problematicus was an eel-like fish that lived in shallow bodies of water in...

2011-12-28 07:46:39

University of Oregon scientist finds evidence that the transition occurred in humid, wooded floodplains A small fish crawling on stumpy limbs from a shrinking desert pond is an icon of can-do spirit, emblematic of a leading theory for the evolutionary transition between fish and amphibians. This theorized image of such a drastic adaptation to changing environmental conditions, however, may, itself, be evolving into a new picture. University of Oregon scientist Gregory J. Retallack,...

African Lungfish Research Hints At New Evolutionary Step
2011-12-13 13:44:14

Researchers have revealed that the African lungfish can use its thin pelvic limbs to propel itself forward. The team's discovery reshuffles the order of evolutionary events leading up to creatures being able to walk, and also suggests that fossil tracks long thought to be the work of early tetrapods could have been produced instead by lobe-finned ancestors of the lungfish. "In a number of these trackways, the animals alternate their limbs, which suggested that they must have been made...

2011-10-05 12:52:59

A study into the muscle development of several different fish has given insights into the genetic leap that set the scene for the evolution of hind legs in terrestrial animals. This innovation gave rise to the tetrapods–four-legged creatures, and our distant ancestors–that made the first small steps on land some 400 million years ago. A team of Australian scientists led by Professor Peter Currie, of the Australian Regenerative Medicine Institute at Monash University, and Dr...

2011-07-07 00:38:56

New data on the initial diversification of jaws sheds light on early vertebrate feeding ecology More than 99 per cent of modern vertebrates (animals with a backbone, including humans) have jaws, yet 420 million years ago, jawless, toothless armour-plated fishes dominated the seas, lakes, and rivers. There were no vertebrates yet on land and the recently evolved jawed fishes were minor players in this alien world, some sporting unusual jaw shapes and structures that bear little physical...


Word of the Day
glogg
  • Scandinavian punch made of claret and aquavit with spices and raisins and orange peel and sugar.
This word comes from the Swedish 'glogg,' which is an alteration of 'glodgat,' mulled (wine).
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