• Popularly called as the ‘Lug worm’ or ‘Lobe Worm’.

• Lives in burrow of muddy sand.

• Lives in ‘U’ shaped tube (Body shape).

• It is a mud eating polychaete.

• Head consist of prostomium and peristomium.

• Appendages are absent in head.

• Body is divisible into – Head, Pre- branchial region, Branchial region and Post – branchial region.

• Possess an eversible proboscis.

• Parapodia are absent.