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Wattwurm haufen.jpg
Lugworm, Arenicola marina, casts on the beach at Ballyholme, Northern Ireland
Scientific classification
Kingdom: Animalia
Phylum: Annelida
Class: Polychaeta
Order: Capitellida
Family: Arenicolidae
Genus: Arenicola
Species: A. marina
Binomial name
Arenicola marina

The lugworm, or sandworm, is a large worm of the phylum Annelida. Lugworms make the coiled tubes of sand that are a familiar sight on a beach at low tide but the lugworm itself is not seen except by people who dig them up from curiosity or to use as fishing bait.

The lugworm can grow to a size of about 9 inches (22 cm). Its body is segmented, like that of an earthworm. It has bristles in the middle of its body. It is a polychaete. It also has well-developed blood-vessels, and gills to breathe in the water.