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erin-burnett » erin-burnett » Ma 1ère rubrique » Dinosaurs diversifié au fil du temps, pas soudainement

Dinosaurs diversifié au fil du temps, pas soudainement

La croyance que les dinosaures ont subi explosifs juste avant la diversification des espèces, ils ont disparu est une illusion, pour les bêtes "principaux changements ont eu lieu l'évolution des millions d'années avant, une étude précise.

L'étrange disparition des dinosaures à la fin de l'ère du Crétacé quelque 65 millions d'années a donné lieu à une opinion populaire qui a presque la teinte de la tragédie grecque.

Tout comme les dirigeants de la Terre avaient atteint leur apogée évolutive, un événement catastrophique - peut-être un espace fermé en rock que la terre - a introduit le rideau sur leur long règne.

Scientifique étayant ce point de vue est le nombre de fossiles de dinosaures remontant à une période appelée la révolution terrestre Crétacé, entre 125 millions à 80 millions d'années, lorsque la terre du livre de la vie a été changée à jamais.

Au cours de cette époque de l'émeute la biodiversité, les plantes à fleurs, des insectes sociaux, les papillons, les groupes modernes de lézards, de mammifères, d'oiseaux et peut-être, aussi, tous apparus.

Certains experts ont suggéré que les dinosaures ont également fait partie du spectacle, comme autant d'étranges fossiles, tels que duckbilled hadrosaures, horned cératopsiens, pachycephalosaurs et autres merveilles, la date de cette époque.

Mais une nouvelle étude, publiée le mercredi dans une revue britannique Proceedings of the Royal Society B, dit que les dinosaures ont été moins d'un sideshow dans l'ADN spectaculaire.

Les chercheurs dirigés par Graeme Lloyd, de l'Université de Bristol, dans l'ouest de l'Angleterre, a élaboré un "supertree" de l'évolution des dinosaures, patiemment, l'analyse de la façon dont plus de 450 espèces - environ 70 pour cent de la connaître trouve - développés.
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