The name Protohadros means "First Hadrosaur", since it was the first hadrosaur living in the Late Cretaceous. It was slightly smaller than Plateosaurus, being 7-8 metres long and 3 feet tall. Unlike Plateosaurus, it was not a prosauropod. It was found in Texas. It was related to two dinosaurs, which are Altirhinus and Eolambia.

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