 Each species differed from each other in the sizes of their glabella, as well as the size and curves of the pygidium and free cheek spines.Cheirurids had the ability to enroll to protect their softer ventral area, and the spines would have thrust upward and outward.In all adult specimens of the genus, the body has up to nine segments, not including the cephalon or pygidium (which is formed from at least two fused and reduced segments).