ringed worms

Echiura (an order of Polychaete ringed worms, commonly referred to as spoon worms)

Common bioturbators include annelids ("ringed worms") such as oligochaetes, bivalves like mussels, clams, gastropods, holothurians.

The annelids (also called "ringed worms"), formally called Annelida (from Latin anellus "little ring"), are a large phylum of segmented worms, with over 22,000 modern species including ragworms, earthworms and leeches.