Tiny Ancient Creature Carried Its Babies Like 'Kites'

A shield protected its head, which was topped by two sweeping antennalike structures, and it used its 12 pairs of legs to scuttle across the sea bottom in what is now Herefordshire in the U.K. The region looks very different today — for one, it's not underwater anymore — but fossils of numerous small creatures like A. spinosus that once inhabited the ocean are preserved in outcrops inside rocky spheres, "like baseballs," of hardened volcanic ash called concretions, which formed aroun