jueves, 31 de diciembre de 2009
miércoles, 30 de diciembre de 2009
lunes, 28 de diciembre de 2009
Lexovisaurus - The Dinosaur with Plates
Lexovisaurus is a dinosaur that had a medium size with enough plates on the body. They were found sometime during Middle to Late Jurassic era. They were named Osmosaurus in the beginning. But later on they were again renamed as Lexovisaurus. The name Lexovisaurus means Lexovian lizard. This again comes from the Celtic culture. Their fossils show them to be a member of the stegosaur family. These were group of herbivorous dinosaurs. They were primarily found in the Northern Hemisphere. Their fossils were found all across China , England and North America .
Not much is known about them. The remains of this species were found in England and France . In the year 1957, Robert Hoffsetter named them Lexovisaurus. They were named after a tribe which used to inhabit the same place. This tribe was called the Gallic tribe.
Procompsognathus, when first discovered in Germany & described in 1913, was regarded as an ancestor to the 3 foot Compsognathus, which held the title for smallest dinosaur until the discovery of Microraptor, a pigeon-sized gliding Dromaeosaurid. It is now thought that Procompsognathus does still belong in the Coelurisauria order, but the crushed fossil does not supply enough information to classify it further. Procompsognathus' only fossilized remains, named SMNS 12591, consists of a crushed & fragmented neck & tail, with the arms & hips badly damaged as well. The supposed head pointed it towards being a Coelophysid, but it is now thought to be a different animal's, pushed close to the Procompsognathus' body. The dinosaur Procompsognathus Triassicus features heavily in & was popularized by the first Jurassic Park novel, however they were depicted as similar to birds, while actually having less relation to them than T. Rex which was made out to lumber slowly, nothing like a bird. Michael Crichton also scripted the dinosaurs as poisonous, based on no fossil evidence.
The Efraasia herbivore dinosaur was first discovered in Baden-Wurttemberg, Germany by Eberhard Fraas.
Efraasia's Fossils have been identified incorrectly, at least, four times in total. Originally these Efraasia fossils were named under the Rauisuchian family as a Teratosaurus(not a Efraasia), named by Friedrich Von Huene in 1908. Rauisuchians were reptile predators in the late triassic Period. On a closer look at the Rauisuchians and the Teratosaurus by a Eberhard Fraas, he found that the fossils more closely resembled a Thecodontosaurus. In 1932 it was mentioned to be a Paleosaurus..
In 2002, even through it was believed that portions of the fossils were a juvenile Sellosaurus, it was identified as a new species (Efraasia).
The Thecodontosaurus meaned socket toothed lizard. Fossils for this Triassic dinosaur were found in South England and Wales. The first fossils of the Thecodontosaurus was destroyed by bombings from Germany in WWII in 1940. More skeleton fossils had been found what was thought in Australia, but probably from England instead.
The Original classification of Thecodontosaurus was a Prosauropoda which was in 1998. but shortly after it was realized that this dinosaur should've been under the Sauropod classification because this dinosaur existed during the timeline where a prosauropod classification was created. Thecodontosaurus just was a little too primitive to fit under the Prosauropoda category.
The Thecodontosaurus was about 1.3 meters long, with a short neck, large skull, large eyes, and leaf shaped teeth. This herbivores hands and feet each had five digits, the hands were long and rather narrow with an extended claw on each. The front limbs were also much shorter than the legs, and the tail was much longer than the head, neck and body put together.
There has also been a major claim that this dinosaur is actually an already described different dinosaur called Pantydraco.
jueves, 3 de diciembre de 2009
A big fin stood like a sail on this huge dinosaur's back! Scientists think the fin was taller than a person. Blood vessels filled the fin . Sometimes wind cooled the blood vessels. These tubes carried the cooler blood through the dinosaur's body.