'Mega-Clawed' Creature Had a Spider-Like Brain

A fossilized brain in the preserved remains of an extinct arthropod reveals an ancient nervous system remarkably similar to that of modern-day spiders and scorpions.

October 16, 2013
3:55 PM EDT
This close-up of the head region of the Alalcomenaeus fossil specimen includes superimposed colors of a microscopy technique that reveal the distribution of chemical elements in the fossil. | N. Strausfeld/University of Arizona