Lugworm  (Arenicola marina)

The presence of this lugworm can be detected by the characteristic signs of one of its U or J-shaped burrows; depressions are formed at the head-end, and a cast of coiled defecated sediment is present at the tail-end (3). This segmented worm has a cylindrical body, which has two distinct regions; the thoracic region bears bristles (known as 'chaetae'), and the last 13 segments also have bushy gills (3). The abdominal region (the tail end), which is thinner than the thoracic region, lacks gills and bristles. The colour of this worm varies greatly; it may be pink, red, brown, black or green (3).