More than 500 million years ago, a creature with multiple spines around its mouth swam the ancient oceans. It was roughly 4 inches long and was likely a relative to modern-day arrow worms that...
This Terrifying Prehistoric Sea Worm Used to Capture Prey with Spines on Head
More than 500 million years ago, a creature with multiple spines around its mouth swam the ancient oceans. It was roughly 4 inches long and was likely a relative to modern-day arrow worms that...