A very nice Dicranurus Monstrosus from Atchana Morocco with perfect details in a free standing style, one of the rarest species of trilobites. There is no restoration in the trilobite at all. Dicranurus (genus Dicranurus) is an extinct arthropod belonging to the trilobites. It lived in the Lower Devonian (about 400 million years ago). Its remains have been found mainly in North America and North Africa.