Thanks for that photo Melissa.
I've always thought that trilobites are very difficult things to learn to identify as there were so many variations. As your specimen is somewhat worn and a bit lacking in surface detail I'm afraid I cannot be certain. I thought initially that it was Phacops
but the glabella, or the central lump on on the head shield looks the wrong shape.
However, having examined a few pictures I'm pretty convinced that it is a trilobite that belonged to the Suborder Calymenina (part of the Order Phacopida). I'd imagine the animal you have there is Calymene sp
, or certainly a very closely linked animal. This was a late Ordovician-Silurian trilobite.
It looks like the fossil has undergone severe and very crude repair. Can you be certain the head, or cephalon, even belongs to the same animal? It should have 11-13 segments on the thorax and a rounded tail (pygidium).
This particular trilobite is, I'm afraid, fairly common and are frequently found in fossil shops around the world. A main source of these seems to be Morocco at the moment. Even though it is not rare, it does not make it any less interesting, though!
Just discovered this amusing fact whilst looking Calymene
up: it is known as the 'Dudley locust'. It was so common in quarries in Dudley near Birmingham, UK, that it actually features on the town's coat of arms!
For information on trilobites this is the ultimate resource on the web:
A Guide to the Orders of Trilobites
Perhaps you might like to look Calymene
up on Dr Sam Gon's site and see if you agree? There is also a nice photo of Calymene
I think the points to look out for are the pattern of notches on the head shield and the shape of the arc of the head.