Oviraptor

The Oviraptor (" robber of œufs") dinosaure Théropode of Mongolia describes for the first time in 1924 by Henry Fairfield Osborn was small a . Its Latin name comes to him owing to the fact that its first fossil was found beside an egg pile which had been taken for eggs of Protoceratops, which been worth with the species the name of O. philoceratops , philoceratops meaning " who likes the cératopsiens. However, it is believed today that these eggs belonged rather to the oviraptor itself - it probably brooded them. This reversal of thought of the scientists is due to a discovery of a connected, Citipati , found animal brooding its eggs (Clark, Makovicky & Barsbold, 2000). The oviraptor form the base of the éponyme family of the oviraptoridés , named by Barsbold Rinchen in 1976. It then used the name to form a group, the oviraptorosaures.

Food mode

The oviraptor could have eaten eggs extremely well indeed. In 1977 however, Barsbold claimed that its nozzle was well enough strong to break the shells of Mollusque S like the Palourde, commune in the geological formations in which one finds the oviraptor. The idea of a jaw to break the shells was initially proposed by Osborn, which believed that this made toothless nozzle, with the extension of some bones under the jaw, could have acted as tool to break the egg shells. These bones, the Ectopterygoïde S, do not form in fact not part of a structure to break eggs, making the theory of Osborn erroneous. However, other craniums of oviraptoridés found in years 1970 and 1980 show that the bones of the jaw are indeed ready to break eggs, being part of the principal bone of the upper jaw (or Maxillaire), which converges in the medium to form a pair of teeth. The remainder of the Palate, contrary to that of all the other dinosaurs, was stretched under the line of the jaw and would have applied a pressure in space between the jaws lower, deprived of teeth. The Kératine forming the nozzle of the birds recovered the higher and lower edges nozzle, and extremely probably the palate, as proposed by Barsbold and Osborn.

Hiring and time

The oviraptor lived towards the end of the Crétacé, during the Santonien, and could also have extremely well lived in with the Campanien, there is that 80 to 70 million years; one almost exclusively finds it in the Formation of Djadokhta in Mongolia, just as in the north-eastern area of the Autonomous region of Neimongol in China, in a sector named Bayan Mandahu. Parents of the oviraptor, put aside Citipati stated Ci-high, account amongst other things Ingenia and Chirostenotes .

Morphology

The oviraptor was one of the dinosaurs having more the pace of a bird among the not-avian dinosaurs. Its Rib cage, amongst other things, watch of the typical features of the birds, of which a whole of elements on each coast which would have kept the rigid cage. A relative of the oviraptor, Nomingia , was found with a Pygostyle, a series of welded vertebrae which nowadays assistance to support the feathers of the tail of the birds.

Traditionally, the oviraptor east depicts with a distinctive peak similar to that of the Casoar. D-examination of some oviraptoridés (Clark, Norell & Barsbold, 2001) showed this well-known dinosaur however was in fact only one species of citipati. The oviraptor extremely probably had an exact peak, but its dimensions, just as its general pace, are not known in an exact way, because the found craniums were often crushed.

Simple: Oviraptor

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