Gigantoscorpio willsi

Gigantoscorpio willsi is an extinct species of scorpion which existed during the Mississippian epoch between 346.7 million and 330.9 million years ago. Its type specimen is BMNH In. 42706a,b, In. 42707, which is a 3D body fossil of its exoskeleton found near modern-day United Kingdom. It grew up to 3 ft long, almost 10 times bigger than the largest scorpion alive today.