Friday, December 11, 2009

Dinosaur fossil fills gaps in evolutionary knowledge

Scientists have unearthed the fossilised bones of a meat-eating dinosaur the size of a large dog which they believed could fill in the gaps about the early evolution and global migration of a group of animals that take over the land for 170 million years.

The dinosaur, called Tawa hallae, lived about 230 million years ago and was originate in a quarry in northern New Mexico. It hold anatomical features that link it with other dinosaurs living much further south in what is now South America. Researchers said that Tawa bear the idea that the dinosaur lineage evolved in the southern part of the supercontinent Pangea. Successive waves of migration from that region resulted in a diverse variety of dinosaurs spreading to other parts of the giant continent, which later on split into several separate continents.

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