Eurypterid
The Eurypterids were the largest arthropods that ever lived. Eurypterids were the most fearsome swimming predators of the Palaeozoic. They ranged in length from six inches to six feet.
Eurypterid fossils have been found on nearly every continent. Eurypterids are still often found in western New York State and southern Ontario, Canada in Silurian rock.
In 1984, Eurypterus remipes was named the State Fossil of New York.