Bargain "Devil Horned" Cyphaspis Walteri Trilobite Cluster

This is a cluster of four, spiny Cyphaspis walteri trilobites collected from the Bou Dib Formation near Mrakib, Morocco. This species is sometimes referred to as the "Devil Horn" Cyphaspis for obvious reasons. The largest trilobite is about 1.65" long including its spines. The preparation on this piece is pretty rough, hence the bargain price.

This species was finally formally described in 2014. A link to the paper can be found below.

“Devil horned” Cyphaspis (Trilobita, Otarioninae): examples from the Middle
Devonian of the Ardennes (Belgium), Eifel (Germany) and Ma’der (Morocco)