The long-necked sauropod dinosaurs were among the most massive creatures to have ever evolved (their immensity only surpassed by the blue whale), but like all dinosaurs their early relatives were quite small. A newly announced early sauropodomorph dinosaur,
About 230 million years ago in what is now Argentina, the first dinosaurs scurried through the forest—creatures that had short arms, sharp-toothed jaws, and ran on two legs. Eoraptor was one such early dinosaur, and it was found in the early 1990s in the same area in which
The discovery of Panphagia has some important implications, and it may become even more important as several as-yet-undescribed dinosaurs mentioned in the paper come to light. Not only does it offer clues about how the sauropod branch of the dinosaur family tree originated, but it hints that there are even older dinosaurs yet to be found. Since Panphagia lived alongside, but was different from, other early dinosaurs like Eoraptor, it can be hypothesized that there was an even earlier divergence between the early ancestors of sauropods and theropods. The common ancestor for all dinosaurs would be even older, and so the new discovery suggests that dinosaur evolution reached back deeper into the Triassic than the evidence previously supported. For now, though, Panphagia is a beautiful transitional fossil that helps us understand how the gigantic sauropods evolved.