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An artist depicts "Jurassic mother", the earliest known ancestor of man, merrily scampering through trees in the hunt for juicy bugs.  (Source: Mark A. Klinger / Carnegie Museum of Natural History)

The discover was made in China's northern Liaoning province, which borders North Korea.  (Source: Wikimedia Commons)

The skeleton was painstakingly reconstructed to reveal its secrets.  (Source: Nature/Beijing Museum of Natural History)

The fossil was dated to 160.7 million years old +/- 0.4 million years, making it the oldest known placental mammal. The fossil was dated by measuring radioactive argon in surrounding sanidine deposits.  (Source: Geowiki)
The 160-million year old mammal marked the split between placental mammals and marsupials

"You and me baby ain't nothing but mammals..." - Bloodhound Gang

Scientists may have just found mankind's oldest relative -- the "Jurassic mother from China", Juramaia sinensis.  The fascinating beast fills in crucial missing details in the fossil record of history's evolutionary tree.

I. A Tiny Rat, A Giant Discovery

The skeleton of the rat-like creature was discovered in Liaoning Province, a northern province of China that borders North Korea.  The skeleton was then analyzed by Zhe-Xi Luo, a Carnegie Museum of Natural History paleontologist; Chong-Xi Yuan and Qing-Jin Meng, Chinese Academy of Geological Sciences researchers; and Qiang Ji, a paleontologist at the Beijing Museum of Natural History.

The fossil including impressions of soft residual tissues like hair, an incomplete skull, and a partial skeleton.  The skeleton contained the forepaw bones (the "hand" bones in a mammal paw) and the skull contained a full set of teeth -- both valuable in identifying the creature's identity.

Examining those bones allowed the researchers to identify the mammal as a eutherian, a group of extinct mammals.  Furthermore, they establish that the creature was a placental-eutherian.

Placental-eutherians are distinguished for having a placenta when pregnant -- similar to man and most other modern mammals.  The placenta is a special organ in the uterine wall that handles resource exchange with the developing fetus.  Marsupials ("metatherians") -- such as kangaroos and opossums -- do not have a placenta when pregnant.

II. Discovery Resolves Evolutionary Discrepancy

The discovery solves a puzzling mystery.  Advanced modern genetic analysis had indicated that the placental-eutherian clade had diverged from marsupial-eutherians approximately 160.7 million years ago.  But until now the oldest placental-eutherian was the "dawn mother" Eomaia -- a 125 million year old rat found in China.  Now the genetic evidence and fossil record are in agreement.

The fossil was dated using the 
40Ar/39Ar method on sanidines -- high temperature feldspars -- in the local sediment.  That dating method was accurate to place the age to within a +/- 400,000-year range.

Man's ancestor was more fur than fight, though.  It weighed around one pound soaking wet and its specially adapted paws allowed it to scurry around in tree avoiding the numerous dinosaur predators that stalked the ground.  Its sharp teeth indicate that it feasted primarily on a diet of bugs.

Professor Luo comments
, "The divergence of eutherian mammals from marsupials eventually led to placental birth and reproduction that are so crucial for the evolutionary success of placentals. But it is their early adaptation to exploit niches on the tree that paved their way toward this success."

In an interview
 with MSNBC, he adds, "I imagine this animal to be a shrew-sized insectivorous mammal that hunted insects and was capable of being active in the trees."

The work is published [abstract] in one of science's top peer-review research journals, Nature.

III. Work is Lauded as Groundbreaking Discovery

Often critical studies such as this one draw a great deal of debate and criticism as not all experts are convinced. In this case, however, the community of paleontology experts seems virtually unanimous in their praise of the work, which they say is a vital leap for the field.

States Gregory Wilson, an assistant professor in the University of Washington
’s Department of Biology, "This new specimen is a real jewel among the spectacular treasure chest of the Chinese fossil record," Wilson said. "The exquisitely preserved anatomical details leave little doubt that we're looking at the earliest eutherian yet known not quite a placental yet but on the line to placentals."

"This significantly pulls several major branches of the mammalian phylogenetic tree even farther back into the Age of Dinosaurs, providing better understanding of the context of mammalian evolution. This work will grip the attention of paleontologists, molecular systematists, and anyone interested in their ancient forebears."

The brave little rat would thrive and flourish in the Chinese woodland eventually giving way to
newer eutherians like Eomaia.  After the mass extinction of the dinosaurs -- which occurred about 95 million years after the Jurassic mother rat -- they would descend from the trees, conquering the empty domain that dinosaurs left behind.  Over the next 65 million years a host of new mammal species evolved including -- eventually -- mankind.



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Mother rat? I knew we came from rodents!
By retrospooty on 8/26/2011 9:43:06 AM , Rating: 2
Glad to see science has found an older mammal relative... Its cool to see all the pieces starting to fit together.




RE: Mother rat? I knew we came from rodents!
By Topweasel on 8/26/2011 10:25:53 AM , Rating: 2
But what about the one before that one.


RE: Mother rat? I knew we came from rodents!
By ramuman on 8/26/2011 10:59:27 AM , Rating: 4
Master Splinter


RE: Mother rat? I knew we came from rodents!
By amanojaku on 8/26/2011 11:21:35 AM , Rating: 5
We didn't need a fossil to prove we descended from rats. The proof already exists:

1) Politicians
2) CEOs
3) Reality TV stars
4) RIAA
5) MPAA
6) Lawyers
7) Extremists
8) People who buy and sell overpriced crap (e.g. $500 jeans, $50 finger food, "boutique" or "gamer" electronics, etc...)
9) Posers
10) The guy who stole my pudding from the company fridge (King Rat)


By therealnickdanger on 8/26/2011 11:28:26 AM , Rating: 3
Don't forget New Jersey in general... on second thought, it looks like you didn't forget.


RE: Mother rat? I knew we came from rodents!
By bchandler02 on 8/26/2011 12:58:37 PM , Rating: 5
You forgot Apple, unless you are counting them as part of #8.


RE: Mother rat? I knew we came from rodents!
By JasonMick (blog) on 8/26/2011 3:28:21 PM , Rating: 4
quote:
You forgot Apple, unless you are counting them as part of #8.
They've also joined lots with category #6 frequently of late, so they seem well represented here.


By Samus on 8/26/2011 4:40:32 PM , Rating: 4
Impossible. Rats have far too much respect for eachother for us to decend from them.


By amanojaku on 8/26/2011 7:53:05 PM , Rating: 3
You guys are being generous, seeing as how you left off 7) Extremists and 9) Posers


By YashBudini on 8/26/2011 7:59:53 PM , Rating: 2
Don't neglect Wall St bankers and lobbyists, omnivores in the food chain.


By FastEddieLB on 8/27/2011 3:28:42 PM , Rating: 2
You're confusing rats with sheep in a lot of those.


False echo
By navair2 on 8/28/2011 12:30:58 AM , Rating: 1
Sooo...Scientists are at it yet AGAIN, trying with ultimate failure to prove the THEORY of evolution by the fossil record...a record CREATED in the deluge of Noah's flood.

Yes, a flood that occurred some 4,500 or so years ago. BTW, a perfect environment for CREATING fossils, which scientists admit a cataclysmic event such as the Flood would have had to occur for fossils to be formed...

Said "scientists" are also unable to come up with ANYTHING linking man to apes since Piltdown, Peking man and a few others have been reliably discredited as having been builtup from the fossil remains of ANIMALS.

Nice try, but still ultimately a RAT.




RE: False echo
By PReiger99 on 8/28/2011 8:08:28 AM , Rating: 2
http://troll.me/images/futurama-fry/not-sure-if-tr...

If you believe that a magical world wide flood (water coming out of nowhere) created a large quantity of layers in the ground then you suffer from an hopeless case of scientific illiteracy. Such imaginary flood would only create a single thick layer (geology 101), not only that but more simple and less complex organisms wouldn't be at the bottom while more evolved on the top (evolutionary order). But I guess you also believe that an old bearded man just build a oil tanker-sized ship... out of wood (who knew that ship building was so well understood back then considering that the Santa Maria was "just" 75 feet long and was build about 4000 years later by a society much more technologically advanced).


RE: False echo
By KnowledgeInternet on 8/29/2011 3:50:10 PM , Rating: 2
Also, archaeological evidence shows undisputed evidence of uninterrupted human societies on all continents continuously thoughout the past 10,000 years - evidence that the World (Earth) did not flood. Asia, Africa, Europe, SouthEast Asia (The Middle East) and The Americas have evidence of human settlement, uninterrupted, THROUGH the time period of this alleged "global flood." Did a downpour of rain from the mountains north of Mesopotamia/Sumer result in a massive flood causing the Euphrates and other rivers in the flat region of Mesopotamia to overflow their banks and "flood" civilization (Think of modern river floods - the land LOOKS like a global flood) ? Yes, archaeological evidence REVEALS that.


RE: False echo
By lagomorpha on 8/28/2011 4:14:09 PM , Rating: 2
Please be a troll.

http://www.fromoldbooks.org/Stone-AmericanAnimals/...

That is an example of a rodent skull. Notice the large incisors. The picture from this article is a species that no longer exists on earth, it has either died out with no progeny or its descendants evolved into other things.


RE: False echo
By CharonPDX on 8/29/2011 2:56:46 PM , Rating: 2
YAY TROLL!

Not a very good troll, either. Too obvious.

Thanks for playing, please try again.


RE: False echo
By navair2 on 8/29/2011 8:52:34 PM , Rating: 2
I'm not playing. I'll continue to believe God's Word over "scientists" who just can't seem to get "it" right. Mankind is so determined to PROVE God wrong they'll believe anything.

As for Noah's flood, if Turkey would let anyone get up to Mt. Ararat, you might see footage of the real vessel. But as long as their government forbids archeological expeditions from going, we won't know, will we?

Now...perhaps someone forgot to tell the truth about some things in recent "digs", such as dinosaur footprints side-by-side with a man's prints in FOSSILIZED ROCK discovered in Texas some years back...or the Plesiosaur carcass dragged up by a Japanese fishing trawler in 1977...or the Coelacanth found alive in 1938, when it was SUPPOSED to be extinct?

This article is nothing more than sorry "research" done by people who don't really KNOW and will continue speculating. I'll trust the Lord, He makes much more sense....;)


RE: False echo
By Skywalker123 on 8/29/2011 11:43:05 PM , Rating: 2
I don't think he's a troll, he's really that stupid


RE: False echo
By lagomorpha on 9/1/2011 2:59:54 PM , Rating: 2
I don't think he can possibly be that stupid, the last post gives it away. Not to mention the idea that some old guy built a boat large enough to house enough animals to repopulate the earth.

"if Turkey would let anyone get up to Mt. Ararat, you might see footage of the real vessel. But as long as their government forbids archeological expeditions from going, we won't know, will we?"

Many towns in Turkey actually make a considerable amount of money from Christians going there on pilgrimage in an attempt to locate Noah's Ark. They generally wander around the mountains for a few weeks digging around and spending money until they give up. Every other year someone even claims to have found a piece of the Ark which always turns out to be a board from some several hundred year old building.


RE: False echo
By mritter1981 on 9/1/2011 6:09:24 PM , Rating: 2
However it should also be noted, that there is no emperical evidence of "God", or intelligent design either. Honestly I'll take the word of a scientist, which the catholic religion once touted as wizards, and subsequently killed. Over the supposed words of a magic man in the sky. Science also shows no racism. Religion does. How many wars were fought over different scientific theories? How many over differences of religion?


Title...
By therealnickdanger on 8/26/2011 9:47:27 AM , Rating: 2
Perhaps:

Scientists: "Jurassic Mother" is Man's Oldest Mammalian Ancestor




RE: Title...
By JasonMick (blog) on 8/26/2011 10:10:19 AM , Rating: 2
Good point! Added "rat" in for good measure.

Thanks for the suggestion. :)


RE: Title...
By lagomorpha on 8/26/2011 1:39:19 PM , Rating: 1
It's probably worth pointing out that it is not a rat or even a rodent. Look at those teeth. Do those look like rodent teeth?

The small mammal may be the ancestor of both humans and rats but it is its own species. This distinction may be important later when creationists ask, "if humans descended from rats whycum there still be rats!?!?" Not that they would be swayed but every little bit of stamping on ignorance helps.


RE: Title...
By retrospooty on 8/26/11, Rating: -1
RE: Title...
By Iketh on 8/27/2011 4:59:56 PM , Rating: 3
you ignorant bastard! you can fix ignorance with education, but you can't fix stupid... unless you have that pill in Limitless


RE: Title...
By retrospooty on 8/28/2011 10:01:18 AM , Rating: 3
Most religious people arent "stupid" per say, they are ignorant. Not uneducated as in, they have never heard of evolution therefore are ignorant of it. They have chosen to ignore 100's of thousands of pieces of geologic, DNA and fossil evidence to prefer a magic man theory. That you cannot fix.


RE: Title...
By PReiger99 on 8/27/2011 10:33:17 AM , Rating: 2
You make too much sense, you don't belong here.


We are descended from rats~~~
By heidilee2 on 8/26/2011 10:29:07 AM , Rating: 2
Wowsers!!!!All people need to realize we are all one family in order to survive!!!!!!!!!!!!!!! If we could embrace our origens as small rodents, it might be easier to see that we are all one family and save ourselves from ourselves.




RE: We are descended from rats~~~
By Bad-Karma on 8/26/2011 10:59:02 AM , Rating: 2
So your saying inter-species incest is preferable? Ewwwwww.....


By YashBudini on 8/26/2011 8:02:52 PM , Rating: 2
quote:
If we could embrace our origens as small rodents, it might be easier to see that we are all one family and save ourselves from ourselves.

And how do we do that? Crawl down into a subway system and invite those local inhabitants to Thanksgiving dinner?


AWESOME title pic!
By andylawcc on 8/26/2011 12:18:44 PM , Rating: 2
what's his name again? crap....




RE: AWESOME title pic!
By LBID on 8/26/2011 2:32:58 PM , Rating: 2
Master Splinter, of course!


You dirty rat!
By Graviton on 8/27/2011 7:45:06 PM , Rating: 2
You killed my great great great great great great great...

...great great great great great grandfather's brother!




lol
By Argon18 on 8/26/11, Rating: -1
RE: lol
By JasonMick (blog) on 8/26/2011 10:16:38 AM , Rating: 2
quote:
humans came from a bug eating tree rat? riiight. lmao, who makes this stuff up??

Not sure if serious:
http://static.esportsea.com/global/images/teams/40...

But your name is argon, so it relates to the article at least! (argon dating?) ;)


RE: lol
By AnnihilatorX on 8/26/2011 10:31:18 AM , Rating: 3
If that makes you feel better, human comes from the remanants of supernova, or stardust.


RE: lol
By ClownPuncher on 8/26/2011 3:51:34 PM , Rating: 3
You saying David Bowie is God?


RE: lol
By kleinma on 8/26/2011 10:40:00 AM , Rating: 3
Versus what? Magic man in the sky making us 6000 years ago?


RE: lol
By Flunk on 8/26/2011 11:09:40 AM , Rating: 3
Over the course of millions of years of evolution, yes. It's actually fairly simple to understand, even if the underlying mechanisms are quite complicated.


RE: lol
By shane.carroll on 8/26/2011 9:19:07 PM , Rating: 2
Umm remember when the sun revolved around the earth? Because I'm pretty sure you do...


RE: lol
By Reclaimer77 on 8/27/11, Rating: 0
RE: lol
By Some1ne on 8/26/2011 9:24:00 PM , Rating: 2
Nobody made it up. That's the point. Observation tells us what is most likely to be true, and we no longer need to rely upon made up stories.


"I modded down, down, down, and the flames went higher." -- Sven Olsen

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