Alpha Centauri 2

 
Please login or register.

Author Topic: Human origins traced to worm fossil in Canada  (Read 783 times)

0 Members and 1 Guest are viewing this topic.

Online Buster's Uncle

  • Celebrating AC2's 10th Year- Little Terraformer That Could
  • Ascend
  • *
  • Posts: 47106
  • €146
  • View Inventory
  • Send /Gift
  • Because there are times when people just need a cute puppy  Soft kitty, warm kitty, little ball of fur  Someone thinks a Winrar is You!  
  • AC2 is my instrument, my heart, as I play my song.
  • Planet tales writer Smilie Artist Custom Faction Modder AC2 Wiki contributor Downloads Contributor
    • View Profile
    • My Custom Factions
    • Awards
Human origins traced to worm fossil in Canada
« on: March 06, 2012, 04:16:26 PM »
Quote
Human origins traced to worm fossil in Canada
AFP – 20 hrs ago...


Paleontologists have traced the origins of humans and other vertebrates to a worm that swam in the oceans half a billion years ago, said a study published Monday.
 
A new analysis of fossils unearthed in the Canadian Rockies determined that the extinct Pikaia gracilens is the most primitive known member of the chordate family, which today includes fish, amphibians, birds, reptiles and mammals.
 
The research published in the British scientific journal Biological Reviews identified a notochord or rod that would become part of the backbone in vertebrates, and skeletal muscle tissue called myomeres in 114 fossil specimens of the creature.
 
They also found a vascular system.
 
"The discovery of myomeres is the smoking gun that we have long been seeking," said the study's lead author, Simon Conway Morris of the Cambridge University.
 
"Now with myomeres, a nerve chord, a notochord and a vascular system all identified, this study clearly places Pikaia as the planet's most primitive chordate.
 
"So, next time we put the family photograph on the mantle-piece, there in the background will be Pikaia."
 
The first specimens of Pikaia were collected by early explorers of the Burgess Shale in 1911. But the animals were overlooked as an ancestor of earthworms or eels.
 
It was not until the 1970s that Morris suggested the five-centimeter (two inch) long, sideways-flattened, somewhat eel-like animal that likely swam by moving its body in a series of side-to-side curves could be the earliest known member of the chordate family.
 
"In particular, it was our use of an electron microscope that allowed us to see very fine details of its anatomy," Jean-Bernard Caron, an assistant professor of ecology and evolutionary biology at the University of Toronto and the study's co-author, told AFP.
 
"It's very humbling to know that swans, snakes, bears, zebras and, incredibly, humans all share a deep history with this tiny creature no longer than my thumb," he said.
http://news.yahoo.com/human-origins-traced-worm-fossil-canada-200018022.html

 

* User

Welcome, Guest. Please login or register.
Did you miss your activation email?


Login with username, password and session length

Select language:

* Community poll

SMAC v.4 SMAX v.2 (or previous versions)
-=-
21 (7%)
XP Compatibility patch
-=-
9 (3%)
Gog version for Windows
-=-
84 (30%)
Scient (unofficial) patch
-=-
31 (11%)
Kyrub's latest patch
-=-
14 (5%)
Yitzi's latest patch
-=-
87 (31%)
AC for Mac
-=-
2 (0%)
AC for Linux
-=-
5 (1%)
Gog version for Mac
-=-
11 (3%)
No patch
-=-
15 (5%)
Total Members Voted: 279
AC2 Wiki Logo
-click pic for wik-

* Random quote

Against such abominations, we organize our defenses on the principle that one strong and able mind can shield the many.
~Spartan Battle Manual

* Select your theme

*
Page created in 0.291 seconds with 34 queries.