Sharks and seals weren’t always the top predators of the oceans. Approximately 518 million years ago, that title went to none other than worms.
According to a new study in Science Advances, a team of researchers recently found the fossils of a previously unknown worm from around 518 million years ago. Terrorizing the oceans around northern Greenland, these fossils were some of the Cambrian’s fiercest, free-swimming predators, representing a long-lost arrow worm, forgotten with the passage of time.
