Eurypterids, colloquially referred to as sea scorpions, are ancient, marine arthropods. They lived in different places around the world.
List of eurypterids
- Megalograptus was a relatively small eurypterid that lived during the Ordovician.
- During the Silurian, larger eurypterids evolved like Pterygotus, which was one of the largest arthropods to ever live.