Sea Scorpions, or Eurypterids, were arthropods that lived in the sea 450-400 million years ago. It ranged from 8 centimetres to 2 metres in length. The species featured on Sea Monsters (BBC) was Megalograptus, which was 1 metre long. Sea Scorpions were carnivorous and had the ability to venture out onto land for limited periods of time. They also mated on land. Their claws ended in razor sharp spines rather than pincers, likely used to sift through the seabed to find food, then rip it to shreds. They had a heavy carapace for defense against larger predators. They were often preyed upon by Orthocones, however because the orthocones could crush them to death and use its beak to break open its carapace.