Claim: Acadagnostus is a genus of the family Peronopsidae, in the order Agnostida, an order of arthropod which first developed near the end of the Early Cambrian period and thrived during the Middle Cambrian.
Evidence: Agnostida is an order of arthropod which first developed near the end of the Early Cambrian period and thrived during the Middle Cambrian. Family: Peronopsidae Order: Agnostida Acadagnostus is a genus of trilobite from the Middle Cambrian, with 7 species currently recognized.