Antarctopelta: Dinosaur of the Day скачать в хорошем качестве

Antarctopelta: Dinosaur of the Day

Antarctopelta: Dinosaur of the Day I Know Dino: The big dinosaur podcast. News, interviews, and discussions about dinosaurs. Are you a dinosaur enthusiast? Learn more at   / iknowdino  . You can also visit http://www.IknowDino.com for more information including a link to dinosaur sites near you. Antarctopelta Name means Antarctic shield Lived in the Cretaceous in what is now Antarctica Hard to classify, because it had characteristics of two different families (ankylosaur and nodosaur) Thompson and others in 2011 suggested it is the basal most known nodosaurid Only one species: Antarctopelta oliveroi Species name is in honor of Eduardo Olivero (found the holotype, first mentioned it in print, and worked in Antarctica for many years) Discovered in 1986 on James Ross Island by Argentine geologists Eduardo Olivero and Roberta Scasso (they were hiking and spotted fragments) Was the first dinosaur found on Antarctica, but the second dinosaur from Antarctica to be formally named (first one named was Cryolophosaurus, which was found in 1993) Found in shallow marine deposits Took almost a decade to excavate because of harsh weather and frozen ground Holotype consists of three teeth, part of the lower jaw, skull fragments, vertebrae, partial limb bones, toe bones, and pieces of armor Lots of bones in poor condition because they were fragmented by freeze-thaw weathering Had been written about in previous publications (1987, 1991), but not named until 2006 Named by Leondardo Salgado and Zulma Gasparini Medium sized, estimated to be about 13 ft (4 m) long Stocky Herbivorous Had leaf-shaped asymmetrical teeth Had large teeth compared to other ankylosaurs (largest one was 0.4 in or 10 mm across) Quadrupedal Six different osteoderms were found near Antarctopelta, but not many were articulated with the skeleton, so it’s unclear where they were on the body One osteoderm is the base of a large spike Also flat, oblong plates, similar to the ones that were around the neck of the nodosaurid Edmontonia Also had large, armor circular plates with smaller, polygonal nodules, that may have formed a shield over the hips Had an oval-shaped osteoderm with a keel running down the middle (found in the ribs so may have run in rows along its flank) And had ossicles (small bony nodules) that were probably all around the body Not much of the skull is known, but all skull fragments found were heavily ossified One bone, a supraorbital, had a short spike that would have come outwards over the eye Not all of the tail was found, but some of the vertebrae found probably was near the tip of the tail and they had ossified tendons, which would have stiffened the tail (probably to support a tail club, though that has not been found for Antarctopelta) Nodosaurs do not have club tails At first scientists thought it was a juvenile, but parts of the vertebrae were fused together (as seen in adults) so may be a subadult Earth was warmer when Antarctopelta lived (no ice in Antarctica then) Lived in forests with conifers and possibly deciduous trees But still would have been dark for long periods of time in the winter Antarctic Peninsula at this time was connected to South America, so animals could have traveled between continents (though no evidence yet of common ankylosaurs between Antarctica and South America) Probably lived in the same area and time as ornithopods like Trinisaura To learn more about dinosaurs and I Know Dino, connect with us on the following sites: Facebook:   / iknowdino   Twitter:   / iknowdino   Tumblr:   / iknowdino   Google+: https://plus.google.com/u/0/100785970... Pinterest:   / dinosauria   LinkedIn:   / i-know-dino   Goodreads: https://www.goodreads.com/review/list... iTunes: https://itunes.apple.com/us/podcast/i... Sound Cloud:   / iknowdino   Stitcher: http://www.stitcher.com/podcast/i-kno... For more I Know Dino videos, subscribe to our YouTube channel at    / @iknowdino