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Paleothyris was a small, agile, lizard-like reptile which lived in the Middle Pennsylvanian epoch in Nova Scotia. Paleothyris had sharp teeth and large eyes, meaning that it was a nocturnal hunter. It was about a foot long. It probably fed on insects and other smaller animals found on the floor of its forest home. Paleothyris was an early sauropsid, yet it still had some features that were more primitive, more tetrapod-like than reptile-like, especially its skull, which lacked fenestra, holes found in the skulls of most modern reptiles, as well as other animals.
