Paleontologists have found a well-preserved fossil of a megacheiran – distant relative of scorpions and spiders – that lived in Cambrian seas about 520 million years ago. The fossil creature, named Alalcomenaeus, is the earliest known to show complete nervous system. This is the fossil of Alalcomenaeus. Image credit: N. Strausfeld / University of Arizona. Collected from the famous Chengjiang formation near Kunming in southwest China, the...
