"Tetrapodophis doesn't show any of those features that you would expect to see in a snake," said Michael Caldwell, a professor and chair of biological sciences at the University of Alberta in Edmonton, Canada, who is leading the new investigation into the enigmatic fossil. For instance, Tetrapodophis amplectus doesn't have hooked teeth like a snake does, nor does it have a snake-like skull and skeleton, Caldwell said. It's unclear exactly how dolichosaurids are related to snakes, but some evidence suggests they are a sister group to the slithery reptiles, Caldwell said.
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