Earliest sea scorpion discovered in Iowa
Huge predator stalked ocean 460 million years ago
![illustration of giant sea scorpion](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2015/09/090415_mr_ancientscorp_main_free.jpg?fit=860%2C460&ssl=1)
SEA MONSTER A new species of giant sea scorpion (illustrated) lived about 460 million years ago and may have used paddlelike limbs to swim.
Patrick Lynch/Yale Univ.