"Walking Cactus" called missing link for insects
Plant or animal? The mysterious fossil defies classification. Fossils from an extinct creature, dubbed a "walking cactus," may reveal a piece of arthropod history in their jointed legs.
Fossils of a 10-legged wormy creature that lived 520 million years ago may fill an important gap in the history of the evolution of insects, spiders, and crustaceans.
The so-called walking cactus belongs to a group of extinct worm-like creatures called lobopodians that are thought to have given rise to arthropods. Spiders and other arthropods have segmented bodies and jointed limbs covered in a hardened shell.
Before the discovery of the walking cactus, Diania cactiformis, all lobopodian remains had soft bodies and soft limbs, said Jianni Liu, the lead researcher who is affiliated with Northwest University in China and Freie University in Germany.
"Walking cactus is very important because it is sort of a missing link from lobopodians to arthropods," Liu told LiveScience. "Scientists have always suspected that arthropods evolved from somewhere amongst lobopodians, but until now we didn't have a single fossil you could point at and say that is the first one with jointed legs. And this is what walking cactus shows." [Image of walking cactus fossil] More>>
Stephanie Pappas (LiveScience.com, Feb. 25, 2011)
"The fact that the child was cremated within the center of the house… this was an important member of society," said study author Ben Potter, an archaeologist at the University of Alaska, Fairbanks.
The child's remains aren't the only thing about the find that excites Potter and his colleagues. The Paleoindian inhabitants of Alaska left few structures behind; usually, archaeologists discover outdoor hearths and specialized tools that suggest temporary work sites or hunting camps.
Annoying head of Egyptian antiquities under fire
(FOX) The political upheaval in Egypt has thrown Egyptian archaeology into a state of uncertainty: Expeditions have been disrupted. Moreover, Zahi Hawass (at left), the head of the country's antiquity council, is now coming under fire from protesters. Known for his flamboyant style -- including an Indiana Jones-style fedora -- and his boosterism of Egypt's treasures, Hawass is the face of Egyptian archaeology. As secretary general of the Supreme Council of Antiquities (SCA), Hawass is in charge of approving any archaeological research that goes on in Egypt. More>>
No comments:
Post a Comment