20mm Yohoia arthropod and 6mm Scenella on 68mm slab from the famous Burgess Shale. Yohoia is famous for its large, grasping appendages near the head, while Scenella is still a mystery, despite looking like a small cap shell. Scenella has been classified as a mollusc, brachiopod and even a cnidarian, but seems to be part of a larger animal like Halkieria, itself thought to be related to monoplacophoran molluscs.
