What are the ancestors of the woodlice?

Woodlice, or pillbugs, are terrestrial crustaceans that belong to the order Isopoda. Their ancestors are primarily aquatic crustaceans, which evolved adaptations to survive on land around 300 million years ago. The closest living relatives of woodlice are marine isopods, which still inhabit aquatic environments today. This evolutionary transition marks a significant adaptation, allowing woodlice to thrive in terrestrial ecosystems.