Discovery of the first ancestors of scorpions, spiders and horseshoe crabs
The fossil illustrated in the publication, one of the most abundant in the deposit, had never been described before. Measuring between 5 and 10 millimeters in size, it has been named Setapedites abundantis. This animal makes it possible, for the first time, to trace the entire lineage of chelicerates, from the appearance of the earliest arthropods to modern spiders, scorpions and horseshoe crabs https://phys.org/news/2024-05-discovery-ancestors-scorpions-spiders-horseshoe.html
