Somnium

                               Cyphaspis cf. heissae

                         VAN VIERSEN & PRESCHER, 2014

                     Middle Devonian, upper Eifelian, Hanonet Formation (lower part)

"Devil horned" Cyphaspis (Trilobita, Otarioninae): examples from the Middle Devonian of the Ardennes (Belgium), Eifel (Germany) and Ma'der (Morocco).

Geologica Belgica (2014) 17/3-4: 268-275