Spiny legged 308-million-year-old arachnid discovered in the Mazon Creek locality

More than 300 million years ago, all sorts of arachnids crawled around the Carboniferous coal forests of North America and Europe. These included familiar ones we'd recognize, such as spiders, harvestmen and scorpions—as well as exotic animals that now occur in warmer regions like whip spiders and whip scorpions.