Calvapilosa kroegeri
Early Ordovician (Arenigian)
Fezouata Formation
Mecissi-Zagora Region, Draa Valley
Morocco
13mm newly discovered aculiferan mollusk on 47mm slab. This slug-like animal with a cap-like shell represents a significant find in the study of molluscs and their origins. Rare

See: Spiny Slugs: New fossil discovery sheds light on mollusk evolution