This is a very rare trilobite association. It is a Selenopeltis buchii and Brongniartella sp. from the Ordovician Sandstone of Morocco. Selenopeltis is a large type of Odontopleurid trilobite that has extremely long genal and pleural spines and two pairs of shorter spines on the pygidium. Brongniartella is a rare Homolonotid trilobite with small eyes and a wide shovel-like lip on the head. This specimen, incredibly, has a complete example of each type represented! This fossil was meticulously prepared here in the EXTINCTIONS Prep Lab under a microscope, as are all of our Moroccan trilobites. The large Selenopeltis is very well articulated and wonderfully prone. The long genal and pleural spines are intact and display strikingly. The Brongniartella is also complete and is very inflated and 3-D. But the best feature of this fossil is that both trilobites are NATURAL to the plate - they are not composited! It is extremely rare to have these two types of trilobites represented on the same slab, but to have two examples of this quality fossilized together is almost unheard of.