Gigantoscorpio willsi

Gigantoscorpio willsi was a prehistoric scorpion species that lived during the Carboniferous Period. Fossils indicate that this ancient arachnid was a giant among its kind, measuring between 35 cm (14 inches) and potentially over a meter (3.3 feet) in length. This size far exceeds modern scorpions, which typically average around 6 cm (2.5 inches).1

The evolution of scorpions dates back to the Silurian Period, with some scientists suggesting they may have evolved from giant water scorpions (order Eurypterida). Early scorpions, like Gigantoscorpio willsi, were likely marine or amphibious, requiring water for support due to their large size. The transition to terrestrial life involved the development of book lungs to replace external gills.2