Pinterest • Le catalogue d'idées

Explorez Aquatique, Science Rocks et plus encore !

à partir de WIRED

‘Living Fossil’ Fish Gets Its Genome Sequenced

The coelacanth isn’t called a “living fossil” for nothing. The 2-meter-long, 90 kg fish was thought to have gone extinct 70 million years ago—until a fisherman caught one in 1938—and the animal looks a lot like its fossil ancestors dating back 300 million years. Now, the first analysis of the coelacanth’s genome reveals why the fish may have changed so little over the ages. It also may help explain how fish like it moved onto land long ago.

Fossil Bee. Colorado Florissant Fossil Beds. Lived in Oligocere, about 35 million years ago.

Seahorse, HondurasPhoto: Marc Mistersaro Snorkeling under a nightclub in Roatan, Honduras, the photographer caught this ethereal image of a seahorse.

Ichthyosaurus Fossil. Ichthyosaurs were reptiles (not fish) that lived during the Triassic (208 to 248 million years ago) and became extinct during the Cretaceous (65 to 146 million years ago) about 95 million years ago. They measured up to 40 feet long, had strong jaws, sharp teeth and big eyes to see their prey.

Publiez ce que vous voulez (où que vous soyez), personnalisez tout ce que vous désirez et trouvez et suivez les sujets qui vous passionnent. Créez votre blog Tumblr dès aujourd'hui.

Trilobite and Coral; Fossils Early Silurian, 440-420 million years ago

Les créatures marines vivant dans les profondeurs océaniques émettent de la lumière

à partir de WIRED

Oldest Preserved Spider Web Dates Back to Dinosaurs

The world’s oldest known spider web has been discovered on a beach in Sussex, England, trapped inside an ancient chunk of amber. Scientists found the rare amber fossil in December, and have now confirmed that it contains remnants of spider silk spun roughly 140 million years ago by an ancestor of modern orb-weaving spiders.

Helicoprion is a long-lived genus of extinct, shark-like[2] eugeneodontid holocephalid fish. Almost all fossil specimens are of spirally arranged clusters of the individuals' teeth, called "tooth whorls." Helicoprion first arose in the oceans of the late Carboniferous 310 million years ago, survived the Permian–Triassic extinction event, and eventually became extinct during the Early Triassic, 250 million years ago. This fossilized jaw shows the spiral dentures.