Social Media Sidebar

Announcement

Please sign up, comment on articles and bring your friends!

Current poll

PlanetTech is asking:

What do you think about our new web site?

Love it, indeed
Really good solution
Same as old one
The old one was better
This is a new option

Quote of the day

People say we're running out of energy. That's only true if we stick with these old 19th century technologies. We are awash in energy from sunlight.

 

Ray Kurzweil

 

World's Oldest Broken Bone Pushes Back Our Transition to Land by Two Million Years

RATE THIS! +44
Posted in Science on 27th May, 2015 06:57 PM by AlexMuller

Researchers analyzing the world’s oldest broken (and healed) bone have discovered that a 333-million-year-old amphibian-looking critter spent most of its life on land, not water. The findings push back the origin of our early terrestrial ancestors by at least two million years. 

 
Tetrapods include all of the land-living vertebrates we have today, including some who returned to life at sea (like whales) and some who lost their legs (like snakes). But exactly when and how terrestrial tetrapods originated has been mystery. Researchers think the advent of vertebrate terrestrialization took place during the Early Carboniferous, but fossils from the first 30 million years of this period are very rare.
 
To better understand this pivotal behavioral transition, Queensland Museum’s Peter Bishop and colleagues studied the oldest known broken tetrapod bone: the forearm of Ossinodus pueri from the mid-Viséan of Queensland, Australia. This two-meter-long primitive tetrapod lived around 333 million years ago, and it fractured its radius under a high-force, impact-type scenario. The presence of a thickened, hardened callus (see image above) indicates that healing had begun; by the time this animal died, its radius was already partially healed. 
 
When the team reconstruct the forces required to cause the fracture, New Scientist explains, they found that the magnitude of the force was so large (relative to the animal’s size) that the fall must have happened on land. Assuming that Ossinodus weighed 25 kilograms (55 pounds), it would only need to fall 85 centimeters (33 inches) to sustain an impact force sufficient to fracture its radius. 
 
"Those kinds of impact forces are very difficult to achieve in water, because water acts like a cushion," Bishop said, speaking to New Scientist. Additionally, the team also found anatomical features in both its spongy bone tissue and the opening to the nutrient canal in its bones that appear to be important adaptations for terrestrial weight support. 
 
Taken together, these findings suggest that Ossinodus spent a significant portion of its time on land. This pushes back the date for the origin of terrestrial tetrapods into the Carboniferous by at least two million years. And that means that it’s possible that terrestriality in vertebrates first evolved in large tetrapods of Gondwana -- rather than in small, 40-centimeter-long European tetrapods that were widely regarded as the oldest known terrestriality adapted vertebrates.

Tags: evolutionfossilbiologyanimalresearchnatural history

Read original article » Back to category

Comments

Author: Guest
Posted: 2015-05-28
+1
This fossil was an amazing find! Timeline of evolution is getting a significant correction and various implications of terrestrial life have to be considered Reply


 

Recent headlines

  • Posted in Hardware on 2017-10-24 02:50:29
    Brain Stimulation can accelerate learning by 40%, could.....read more
    Posted in Software on 2017-10-23 16:21:22
    Low Level AI specialists make $300K-500K and top names.....read more
    Posted in Science on 2017-10-23 16:18:39
    Spacex Falcon Heavy should launch in the next 37 days..read more
    Posted in Science on 2017-10-23 16:12:52
    More acidic oceans 'will affect all sea life'..read more
    Posted in Science on 2017-10-22 20:21:21
    Moon colonization: many lava tube caves, water and high.....read more
Posted in Business on 2013-10-10 01:33
China is working towards a manned lunar mission in about.....read more
Posted in Business on 2013-10-20 07:17
Spacex says China is their main competitor for commercial.....read more
Posted in Software on 2013-10-20 06:43
Pirate Bay Browser Clocks 1,000,000 Downloads..read more
Posted in Medicine on 2013-10-10 02:10
Google reportedly investing hundreds of millions into new.....read more
Posted in Medicine on 2013-10-14 03:13
Endothelial Cells Can Repair and Regenerate Organs,.....read more
Posted in Science on 01.01.2010
Spacex says China is their main competitor for commercial.....read more
Posted in Science on 01.01.2010
Staring at Your Phone Could Be Making You Short Sighted..read more
Posted in Science on 01.01.2010
Oculus Rift virtual reality headset coming to mobile, but.....read more
Posted in Science on 01.01.2010
China is working towards a manned lunar mission in about.....read more
Posted in Science on 01.01.2010
Delivering drugs via nanoparticles to target mitochondria..read more

Recent Blog Posts

  • Posted by AlexMuller
    Scientists probe Neptune's depths to reveal secrets of icy.....read more
    Posted by AlexMuller
    New terahertz imaging approach could speed up skin cancer.....read more
    Posted by AlexMuller
    Rebutting the claim that antidepressants do not work..read more
    Posted by AlexMuller
    Artificial neural networks decode brain activity during.....read more
    Posted by AlexMuller
    Four Earth-sized planets detected orbiting the nearest.....read more

Login to your Account

Login to your PlanetTech Account here

Username:
Password:
Remember me
or

Create a New Account

You just need username and password

The following errors occured:
Username:
Email:
Password:
Verify password:
Remember me