New DH calendar
Article updated: 10/15/2013 7:43 AM

Dino DNA? No, but fossilized mosquito has been found

This image provided by the Smithsonian Institution shows a fossilized female mosquito in a paper-thin piece of shale. The 46 million year-old insect drew blood in its last meal, was blown into a lake in what is now northwestern Montana and sank, belly still full. It's a first for biology, a blood meal found intact in a fossil.

This image provided by the Smithsonian Institution shows a fossilized female mosquito in a paper-thin piece of shale. The 46 million year-old insect drew blood in its last meal, was blown into a lake in what is now northwestern Montana and sank, belly still full. It's a first for biology, a blood meal found intact in a fossil.

 

Associated Press

The dinosaurs in “Jurassic Park” were cloned from DNA found in fossilized mosquitos like the one recently discovered in Montana — but don’t expect life to imitate art.

The dinosaurs in "Jurassic Park" were cloned from DNA found in fossilized mosquitos like the one recently discovered in Montana -- but don't expect life to imitate art.

 

Associated Press

 1 of 2 
 
text size: AAA
By Associated Press

WASHINGTON -- In a steamy tropical forest 46 million years ago, a prehistoric mosquito bit a critter, drew blood and was blown into a lake in what is now northwestern Montana. Belly full, she died and sank.

Flash forward to the present. Researchers found the minuscule female insect fossilized in a paper-thin piece of shale -- which had sat in someone's basement for 25 to 30 years with other rocks -- and concluded it still contains its last supper. A study in the Proceedings of the National Academy of Science reports a first for biology: a blood meal found intact in a fossil.

Advertisement

While the scenario sounds eerily similar to the Michael Crichton book and movie "Jurassic Park," no new T. rexes will result.

Unfortunately for would-be dinosaur cloners, the mosquito flew long after dinosaurs went extinct, and its meal was probably blood from a dino descendant, a bird. And an even bigger blow to the "Jurassic Park" scenario is that scientists have long known that DNA from other critters couldn't survive in insect fossils, said study lead author Dale Greenwalt, a retired biochemist who collects and analyzes insect fossils from Montana for the Smithsonian Institution.

So this is more a scientific curiosity, a look-what-we-found, that starts out like early chapters of the sci-fi thriller.

"It's following Crichton's script in that we're using a blood engorged fossil mosquito and in this case we're using the direct descendent of the dinosaurs, given that we're 20 million years late," Greenwalt said.

Using two different types of light-refracting x-rays that determine what chemicals are present, Greenwalt and colleagues determined that the female mosquito's belly was full of iron, a major feature of blood that gets oxygen to the rest of the body. Iron levels were higher than elsewhere in her body and anywhere on a non-biting male used as a control subject. Then the team found evidence of porphyrins, which are bound to iron in blood. Putting the two together makes "a definitive case" for blood, Greenwalt said.

Outside expert Mary Schweitzer of North Carolina State University said while the study is exciting and significant, it is preliminary and she thinks Greenwalt's team didn't prove their conclusion that it is blood by ruling out all other possibilities.

Comments ()
We are now using Facebook comments to offer a more inclusive, social and constructive discussion. Guidelines: Keep it civil and on topic; no profanity, vulgarity, slurs or personal attacks. People who harass others or joke about tragedies will be blocked. If a comment violates these standards or our terms of service, click the X in the upper right corner of the comment box. To find our more, read our FAQ.

This article filed under

Latest Video

MostViewed

Today
Yesterday
Most Commented
Top Jobs

    View all Top Jobs Place a job ad

    MarketsReport

    DHExtras

       
    • Newspaper next section - Newspaper next section Report card checker - report card checker
    • Dh innovation award 2 - Dh innovation award 2 Zillow /real estate page
    • Discuss refer On Guard series
    • Newspaper archives -- Monday or anyday Mike North

    FacebookActivity

    BusinessDirectory

    Connect with a business or service in your area fast. First select a town, then enter a search term or choose one of the listed popular searches:

    Don't see your town listed? Visit our full directory to begin your search.