1.1" Devil Horned Cyphaspis Walteri Trilobite With Two Headers

Here is nice, 1.1" long example of the Devonian trilobite Cyphaspis walteri sometimes referred to as the "Devil Horn" Cyphaspis for obvious reasons. It is nicely prepared with free-standing spines and about 2% shell restoration. There are two heads of Cyphaspis, one ventral and one dorsal associated with it.

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)