This is a classic trilobite. It is a Wanneria walcottana from Pennsylvania. This specimen was collected in 1984, and has been in a collection ever since. This trilobite was split out of the rock. Both the part and counterpart of the trilobite are present. The counterpart (not pictured) may be even more detailed than the trilobite itself. This is a true Wanneria, which are much rarer than Olenellus in the fossil record. The trilobite is complete, and showcases the textbook bilobate pygidium extremely well. This specimen is much better than the photo shows. It is an excellent example of this rare trilobite from a locality that has been closed for over a decade.