Polychaete worm
Early Ordovician (Arenigian)
Upper Fezouata Formation
Zagora, Draa Valley
Morocco

Ordovician polychaete worms were marine segmented worms that lived during the Ordovician Period, approximately 485–444 million years ago. Like modern polychaetes, they belonged to the annelid group and inhabited ancient seafloors ranging from shallow tropical shelves to deeper marine environments.
37mm ploychaete worm on 97mm slab