Social Media Sidebar


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

Just because something doesn’t do what you planned it to do doesn’t mean it’s useless.


Thomas Edison

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

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


Author: Guest
Posted: 2015-05-28
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 Science on 2019-01-05 00:26:50
    China Lands Chang'e 4 on the Far Side of the more
    Posted in Science on 2018-12-31 00:24:45
    Support for Human Gene Editing to Fix Diseases in more
    Posted in Science on 2018-12-31 00:15:06
    Will Mimicking The Nervous System Advance more
    Posted in Science on 2018-12-26 15:04:48
    NASA Gives Us Sugar in Space to Confirm Building more
    Posted in Business on 2018-12-21 22:48:10
    US Air Force Funds SpaceX Starlink For $28.7 more
Posted in Business on 2013-10-10 01:33
China is working towards a manned lunar mission in more
Posted in Business on 2013-10-20 07:17
Spacex says China is their main competitor for more
Posted in Software on 2013-10-20 06:43
Pirate Bay Browser Clocks 1,000,000 more
Posted in Medicine on 2013-10-10 02:10
Google reportedly investing hundreds of millions into more
Posted in Medicine on 2013-10-14 03:13
Endothelial Cells Can Repair and Regenerate Organs, more
Posted in Science on 01.01.2010
Spacex says China is their main competitor for more
Posted in Science on 01.01.2010
Staring at Your Phone Could Be Making You Short more
Posted in Science on 01.01.2010
Oculus Rift virtual reality headset coming to mobile, more
Posted in Science on 01.01.2010
China is working towards a manned lunar mission in more
Posted in Science on 01.01.2010
Delivering drugs via nanoparticles to target more

Recent Blog Posts

  • Posted by AlexMuller
    Even light drinking increases risk of more
    Posted by AlexMuller
    Researchers have discovered how to slow more
    Posted by AlexMuller
    Human retinas grown in a dish explain how color vision more
    Posted by AlexMuller
    The smartphone app that can tell you’re depressed before more
    Posted by AlexMuller
    Neural networks don’t understand what optical illusions more

Login to your Account

Login to your PlanetTech Account here

Remember me

Create a New Account

You just need username and password

The following errors occured:
Verify password:
Remember me