Megalograptus was a giant sea scorpion from the Ordovician period. It hunted fish and other smaller arthropods. They are capable of coming on to land and scavenge any dead thing that lands on to the shores. It relies heavily on there giant pincers to catch its prey similar to modern large scorpions also rely on there pincers. They are hunted by the larger Ornithocones like Cameroceras.