The lugworm or sandworm (''Arenicola marina'') is a large marine worm of the

phylum In biology, a phylum (; plural: phyla) is a level of classification or taxonomic rank below kingdom and above class. Traditionally, in botany the term division has been used instead of phylum, although the International Code of Nomenclature ...

Annelida. Its coiled

castings In metalworking Metalworking is the process of shaping and reshaping metals to create useful objects, parts, assemblies, and large scale structures. As a term it covers a wide and diverse range of processes, skills, and tools for producing ob ...

are a familiar sight on a beach at low tide but the animal itself is rarely seen except by those who, from curiosity or to use as

fishing bait Fishing bait is any substance used to attract and catch fish, e.g. on a fishing hook. Bait items are both selected from and placed within the environment to achieve enhanced prey capture success. Traditionally, fishing baits are natural fish foo ...

, dig the worm out of the sand. In the UK, the lugworm species ''Arenicola marina'' is commonly known as the blow lugworm, and rarely exceeds . There is a second species of UK lugworm ''Arenicola defodiens'' commonly called the black lugworm. As well as growing larger than blow lugworm (in line with descriptions for Europe and North America lugworm below) they are generally much darker, often totally black. They can be distinguished by the different wormcasts they produce - ''Arenicola defodiens'' makes a spiral cast, while that of ''Arenicola marina'' is jumbled. When fully grown, the lugworm of the coasts of

Europe Europe is a large peninsula conventionally considered a continent in its own right because of its great physical size and the weight of its history and traditions. Europe is also considered a Continent#Subcontinents, subcontinent of Eurasia ...

is up to long and in diameter. Other species on the

North America North America is a continent in the Northern Hemisphere and almost entirely within the Western Hemisphere. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and th ...

n coast range from . The body is like that of any typical annelid: ringed or segmented. Its head end, which is blackish-red and bears no tentacles or bristles, passes into a fatter middle part which is red. This in turn passes into a thinner yellowish-red tail end. The middle part has bristles along its sides and also pairs of feathery gills. There is a well-developed system of blood vessels with red blood rich in the oxygen-carrying pigment, haemoglobin.

Life in a burrow

A lugworm lives in a U-shaped burrow in sand. The U is made of an L-shaped gallery lined with mucus, from the toe of which a vertical unlined shaft runs up to the surface. This is a head shaft. At the surface the head shaft is marked by a small saucer-shaped depression. The tail shaft, from it, is marked by a highly coiled cast of sand. The lugworm lies in this burrow with its head at the base of the head shaft, swallowing sand from time to time. This makes the columns of sand drop slightly, so there is a periodic sinking of the sand in the saucer-shaped depression. When it first digs its burrow the lugworm softens the sand in its head shaft by pushing its head up into it with a piston action. After that the sand is kept loose by a current of water driven through the burrow from the hind end by the waves of contraction passing along the worm's body. It weighs . Lugworms also have hairs on the outside of their bodies that act as external gills. These can rapidly increase its uptake of oxygen. Lugworm blood has a large oxygen carrying capacity which may have medical applications. Lugworm cast

Burrowing larvae

Once it burrows into the sand a lugworm seldom leaves it. It can stay there for weeks on end, sometimes changing its position slightly in the sand. But it may leave the burrow completely and re-enter the sand, making a fresh burrow for breeding but for 2 days in early October there is a genital crisis. This is when all the lugworms liberate their ova and sperms into the water above, and there the ova are fertilized. The ova are enclosed in tongue-shaped masses of jelly about 8 inches long, 3 inches wide and 1 inch thick. Each mass is anchored at one end. The larvae hatching from the eggs feed on the jelly and eventually break out when they have grown to a dozen segments and are beginning to look like their parents. They burrow into the sand, usually higher up the beach than the adults, and gradually move down the beach as they get older.

In popular culture

A singing lugworm figures in ''The Man Who Dreamed of Faeryland'' by

William Butler Yeats William Butler Yeats (13 June 186528 January 1939) was an Irish poet, dramatist, writer and one of the foremost figures of 20th-century literature. He was a driving force behind the Irish Literary Revival and became a pillar of the Irish liter ...

:Yeats, W.B
The Man Who Dreamed of Faeryland
/ref>

Cartoonist A cartoonist is a visual artist who specializes in both drawing and writing cartoons (individual images) or comics (sequential images). Cartoonists differ from comics writers or comic book illustrators in that they produce both the literary and g ...

Piers Baker created a syndicated

comic strip A comic strip is a Comics, sequence of drawings, often cartoons, arranged in interrelated panels to display brief humor or form a narrative, often Serial (literature), serialized, with text in Speech balloon, balloons and Glossary of comics ter ...

called '' Ollie and Quentin'', with a buddy storyline about Ollie, a

seagull Gulls, or colloquially seagulls, are seabirds of the family Laridae in the suborder Lari. They are most closely related to the terns and skimmers and only distantly related to auks, and even more distantly to waders. Until the 21st century, ...

and Quentin, a lugworm. The strip originated in the UK in 2002, with

King Features Syndicate King Features Syndicate, Inc. is a American content distribution and animation studio, consumer product licensing and print syndication company owned by Hearst Communications that distributes about 150 comic strips, newspaper columns, editori ...

introducing it to international

syndication Syndication may refer to: * Broadcast syndication, where individual stations buy programs outside the network system * Print syndication, where individual newspapers or magazines license news articles, columns, or comic strips * Web syndication, ...

in early 2008. Baker considers the strip "an homage to all the poor lugworms that he used as bait while sea fishing in his youth."

References

External links

Lugworm at Britannica Online

Video footage of Lugworm funnels and casts
{{Taxonbar, from=Q21155 Polychaetes Animals described in 1758 Taxa named by Carl Linnaeus