The tube anemone has a long worm-like body protected by a membranous tube that rests in the sediment on the sea bed. The open end of the tube has two whorls of tentacles (totalling more than 200) subdivided between labial and feeding tentacles which are often different colours. The external, labial tentacles are over 20cm long while the inner, feeding tentacles, are much shorter. Colours vary between violet and fuchsia, allowing the two varieties to be distinguished.
This species lives inside a long tube ( up to approx. 1m.) The tube is actually produced by the animal itself by secreting mucus which solidifies when it comes into contact with the water. The tube anemone feeds on plankton and small marine life and reproduces between January and July.