Megalograptus (name meaning "Big Writing") is a genus of eurypterid that originated during the Late Ordovician Era in what is now North America. These sea scorpions are famous for being among the first creatures to come onto dry land.
Thought to have been extinct for 443 million years, there are still some that remain alive on Primeval Island. In fact, they are among the most common eurypterid there, alongside Jaekelopterus, Brontoscorpio, and Pterygotus.