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ALL ABOUT DINOSAURS!
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Chasmatosaurus, a crocodile-like, meat-eater (a thecodont) from the Triassic period.
This is a cladogram of the clade Reptilia (reptiles), tracing the ancestry of these groups.
Until recently, the earliest-known dinosaur was Eoraptor lunensis (meaning"dawn raptor") which lived about 228 million years ago. It was a small, primitive theropod (a bipedal meat-eater) about 3 feet (1 m) long. It lived in what is now Argentina, South America (fossils were found at the Ischigualasto Formation).
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