When many people at the natural history museum flock to the large fossil remains or eye-catching exhibits, they often overlook the smaller groups of creatures, such as eurypterids. Eurypterids are the order that is part of the Arthropod phylum, and contain the well-known Eurypterus remipes species. These ancient creatures look like a cross between modern scorpions, lobsters, and horseshoe crabs. They are a quite fascinating group of organisms that went from being predators to prey and from prevalent in the Ordovician to extinct during the mass Permian extinction.
All About Eurypterids 