Rare Presbynileus ibexensis Utah Ordovician Trilobite

Here is a superbly-preserved Ordovician trilobite from Utah known as Presbynileus ibexensis. The state is far better known for its panoply of Cambrian trilobites, with those from the Ordovician considerably more rarely seen. It is completely articulated and quite 3-D in appearance, an exceptional example of this uncommon trilobite. This one is enrolled in a defensive posture, perhaps a response to whatever stress led to its demise.