Two Walliserops trilobites, frozen mid-crawl across a Devonian seafloor. Finding one of these elaborate trilobites requires breaking through meters of Moroccan limestone. Finding two this close together is exceptionally rare.

Each trilobite displays the genus's signature feature: a three-pronged trident extending from the head like a crown. Dozens of free-standing spines radiate from their bodies, delicate structures that required painstaking preparation to reveal. Four hundred million years ago, these armored arthropods used compound eyes to navigate shallow tropical seas, their spines possibly serving as sensory organs, defensive weapons, or elaborate displays for attracting mates.