• Arenicola is commonly known as lug-worm or lobe-worm.

• Body is stout, elongated, cylindrical worm-like measuring up to 20 to 25 cm in length and brownish or greenish in colour.

• Body is divisible into three regions, anterior, middle and posterior.

• The anus opens through the last segment.

• Arenicola is a marine worm, lives in U-shaped burrows of sand and mucus