The bristleworm Protula tubularia is widespread on southern and western coasts of Britain where it lives right down from the shore to a depth of 100m. Often found singly, it builds a short, white, calcerous tube and the colourful. flower-like head projects to catch suspended material. Not easy to approach and the head will snap back into the tube if it detects movement or a sudden shadow.
Loch Nevis, Western Scotland