Cordania sp.
A rare species from Oklahoma, USA, Cordania. It belongs to the Class Trilobita, Order Proetida, Superfamily Aulacopleuroidea, Family Bathymetopidae.
It tends to trade at high prices due to the high popularity of its disc-shaped head and spines, as well as its low yield.
This specimen was prepped by Bob Carroll in 2012.
I believe I obtained a rare specimen at a very low price through an auction.