Diacalymene

Diacalymene is a genus of trilobite from the order Phacopida, suborder Calymenina. It includes the species "D. ouzregui", "D. clavicula", "D. diademata" and "D. gabrielsi". It lived in the Ordovician and Silurian periods.
Distribution.
Fossils of the genus have been found in: