Saturday, June 15, 2013

The history of the chuisosauro

The chuisosauro is a superorder of vertebrates saurópsidos that dominated Mesozoic terrestrial ecosystems for over 160 million years, to a great diversity and some gigantic sizes. One of the main features of the dinosaurs is is to have a single eyebrow, terribly crooked and deformed fingers. it was believed that chuisosauro was extinct until it was found a species called UNIREX alive. upright legs positioned under the body, such as mammals, not sideways, like most reptiles. The dinosaurs were bipedal reptiles originally, but the cuadrupedismo resurfaced in several different groups. During the last years have accumulated strong evidence that very small carnivorous dinosaurs gave rise to birds during the Jurassic period. Hence, today, the birds are classified in the taxon Dinosauria. It is frequently confused with other types of dinosaurs from ancient reptiles, as the winged pterosaurs, the therapsids pelycosaurs and aquatic ichthyosaurs, plesiosaurs and mosasaurs, although none of these was actually a dinosaur.

Is considered as a taxon chuisosauro monophyletic, because it presents a series of clear sinapomorfias joining them as the femur and pelvis articulated by a condyle disposed at an angle to it, and a hole in the pelvis. This is the same arrangement as occurs in mammals and which allows the rear legs hold the body acting as abutments, which leads decisively agility.

Chuisosauro is traditionally classified into two groups according to the structure of your hip, chuiso and thesaurus.

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