Phacopida
Videos
Phacopida is an order of trilobites that lived from the Late Cambrian to the Late Devonian. It is made up of a morphologically diverse assemblage of taxa in three related suborders.
Dalmanites limulurus trilobite silurian
Tribnod 1
Phacopidae
Videos
Phacopidae is a family of phacopid trilobites that ranges from the Lower Ordovician to the Upper Devonian, with representatives in all paleocontinents.
Phacopida
…eyes. In Phacopida, these were retained, via delayed growth of these immature structures (post-displacement), into the adult form. Eldredgeops rana (Phacopidae) and Dalmanites limulurus (Dalmanitidae) are two of the best-known members of this order. Other known phacopids include Cheirurus (Cheiruridae), Deiphon…
Drotops armatus, Middle Devonian, Bou D Ob Formation, Jbel Issoumour & Jbel Mrakib, Ma Oder Region, Morocco Houston Museum of Natural Science DSC01634
Schizochroal eye of Elredgeops rana
Ductina vietnamica, a phacopid that lacks eyes