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This lid has up to 160 fine creases around its edge and is symmetrical and usually red. The yellow-coloured body has seven thoracic segments and up to 190 abdominal segments which are protected by the tube.If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button.We'll notify you via e-mail of your refund once we've received and processed the returned item.It is the type species of the genus Serpula and was first described by Linnaeus in 1767. Serpula vermicularis lives in a calcareous tube which is attached to a rock, boulder or other hard surface.The tube is often curved, but is not tightly coiled as in some other related species.Large colonies sometimes form, but these are seldom on rocks. Calcium for its manufacture is stored in two white sacs on the ventral side of the peristomium.

Larvae may settle on the tubes of other worms and their subsequent development can form reefs. This is sometimes due to the activity of certain boring sponges, such as Cliona celata (red boring sponge). The tube is fabricated by the glandular ventral shields on the other thoracic segments, where calcium is mixed with an organic secretion to make a paste.

At least four segments with setae (bristles) are found in the thoracic region.

Serpula vermicularis is cosmopolitan in distribution. It is found in the Pacific and Indian Oceans and the European seaboard of the Atlantic Ocean, but not on the North American coast.

The blood is then pumped through a ventral blood vessel to the tip of the abdomen before returning through a sinus adjoining the gut. vermicularis contains the oxygen-binding pigment chlorocruorin. As well as transporting oxygen to the tissues, this binds carbon monoxide much more efficiently than does human haemoglobin.

This may be the reason why the worm may settle and grow on brown seaweeds such as Fucus, but avoids giant kelp, Nereocystis.

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