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gigantic DINOSAUR - Dinosaurier * Riesen der Urzeit - Halle/Saale

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Published on Apr 9, 2012

Dinosaurs are a diverse group of animals of the clade Dinosauria. They first appeared during the Triassic period, 231.4 million years ago, and were the dominant terrestrial vertebrates for 135 million years, from the beginning of the Jurassic (about 201 million years ago) until the end of the Cretaceous (66 million years ago), when the Cretaceous--Paleogene extinction event led to the extinction of most dinosaur groups at the close of the Mesozoic Era. The fossil record indicates that birds evolved from theropod dinosaurs during the Jurassic Period and, consequently, they are considered a subgroup of dinosaurs by many paleontologists. Some birds survived the extinction event that occurred 66 million years ago, and their descendants continue the dinosaur lineage to the present day.
Die Dinosaurier (Dinosauria, von griechisch δεινός deinós ‚schrecklich', ‚gewaltig' und σαῦρος sauros ‚Eidechse') waren die Gruppe der Landwirbeltiere (Tetrapoda), die im Mesozoikum (Erdmittelalter) von der Mittleren Trias vor rund 235 Millionen Jahren bis zur Kreide-Tertiär-Grenze vor etwa 65 Millionen Jahren die festländischen Ökosysteme dominierte.
In der klassischen Systematik werden die Dinosaurier als ausgestorbener Zweig der Reptilien betrachtet, aus kladistischer Sicht jedoch schließen die Dinosaurier als systematische Einheit die Vögel, die aus einer Gruppe kleiner theropoder Dinosaurier hervorgingen, ein. Somit gingen nicht alle Dinosaurier während des Massenaussterbens am Ende des Mesozoikums unter, sondern es überlebte ein kleiner, spezialisierter Teil von ihnen bis heute als Vögel.

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