Alitta virens, commonly known as the sandworm or ragworm, is a marine polychaete worm notable for its burrowing habits in sandy and muddy substrates. It can reach up to 1 meter in length and is characterized by its segmented body and parapodia for locomotion. Sandworms play a crucial ecological role as both prey for birds and fish and as sediment aerators.

Alitta virens, commonly known as the sandworm or king ragworm, is native to the North Atlantic Ocean. Its geographical distribution extends along the coasts of Europe, from the North Sea and the British Isles down to the Mediterranean. It is also found along the eastern coast of North America, from the Gulf of Saint Lawrence to the Carolinas.

Alitta virens typically inhabits intertidal and subtidal zones, thriving in sandy or muddy substrates where it can burrow. It is often found in environments with moderate to high salinity, typical of marine coastal areas. The species prefers temperate climates where it can benefit from moderate temperatures and nutrient-rich waters.

This polychaete worm plays a crucial role in the benthic ecosystem as a detritivore, feeding on organic matter in the sediment. Its burrowing activity helps aerate the substrate, promoting nutrient cycling and providing habitat for other marine organisms. Additionally, Alitta virens serves as an important food source for various fish and bird species, contributing to the coastal food web.