Redlichiina is a suborder of the order Redlichiida of Trilobites. The suborder contains three superfamilies: Emuelloidea, Redlichioidea and Paradoxidoidea. These trilobites are some of the oldest trilobites known. They originated at the beginning of the Cambrian era and disappeared (possibly by evolving into members of the Ptychopariida order) at the end of the middle Cambrian. Physiology (See the Trilobite article for a definition of morphological terms) Cephalon: Opisthoparian facial sutures.… (More on Redlichiina)