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New track on the dawn of the dinosaurs

The "corridor of dawn, or Eodromaeus , was a small theropod that lived during the Late Triassic as Argentina and is now about 230 million years ago was the Southwest Pangea. This small dinosaur about 2 meters was very similar to a Tyrannosaurus rex . In fact, current thinking is that this lizard is the oldest ancestor of the fearsome T. rex. Eodromaeus . illustration from here. One of the results of a study recently published in the journal Science , bipedal dinosaur suggests that it took the made Eoraptor , another small dinosaur that until recently was regarded as the grandfather of theropods. Eoraptor means "dawn thief" and was found-as- Eodromaeus in Ischigualasto Provincial Park or Moon Valley in northwestern Argentina. Eoraptor compared with Homo sapiens. Illustration Dropzink Wikipedia taken. A reassessment of Eoraptor suggests that this lizard was, in fact, an ancestor of the huge vegetarian dinosaurs like Apatosaurus . It is interesting note that Eoraptor and share Eodromaeus morphological characteristics. However, everyone seems to be the ancestor of two different groups of Eodromaeus theropods and Eoraptor of sauropodomorphs . Among theropods are a variety of bipedal dinosaurs, mainly carnivores and the huge sauropodomorphs were very long-necked dinosaurs. This emphasizes the fact of how similar were the ancestors of both groups, which is not surprising considering that this would be the early stage of radiation evolution. Then, the discovery of Eodromaeus , reassessment of Eoraptor and other fauna found in the formation of Ischigualasto suggests that early dinosaurs had morphological features characterize locomotives after other groups of dinosaurs. Therefore, the study authors, led by Ricardo N Martinez de la Universidad Nacional de San Juan suggest that dinosaurs were not "swept" to rival groups, on the contrary, it seems that way his reign was more gradual than previously thought. Apparently, the extinction of other herbivores, not within the group of dinosaurs was gradual and not the result of opportunistic replacement of the dinosaurs, as has been suggested previously. This last point is important. Paleontologists are not only interested in the twilight of the dinosaurs and the tragic stories about that. This type of scientists also are passionate about knowing the origins of this once successful group of reptiles. Some paleontologists may prefer to be cautious about the results of Ricardo and his research colleagues and, indeed, independent groups of researchers assessed the new track on the dawn of the dinosaurs, featuring now-very poetically, the "corridor of dawn." Reference article:

Martinez, R., Sereno, P., Alcober, O., Colombi, C., Renne, P., Montanez, I., & Currie, B. (2011). A Basal Dinosaur from the Dawn of the Dinosaur Era in Southwestern Pangaea Science, 331 (6014), 206-210 DOI: 10.1126/science.1198467

Other notes about the finding:
"Pint-predator rattles the dinosaur family tree "
" The grandfather of Tiranosuario paqueño rex"
"Discovered in Argentina an ancestor of predatory dinosaurs "
" publish a finding Argentine scientists in Science magazine "