Friday, December 18, 2009
Scientists in the US have unearthed the fossilised bones of a meat-eating dinosaur the size of a large dog which they say could fill in the gaps about the early evolution and global migration of a group of animals that ruled the land for 170 million years.
Tawa hallae lived about 230 million years before and was found in a quarry in northern New Mexico. It owns anatomical features that link it with other dinosaurs living much further south in what is now South America.
Researchers say Tawa bears 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 split into numerous separate continents.