When removed from the tube, this individual is about 6 cm total length. Note that the animal has immediately begun to produce a new mass of mucus around itself.
A colony of Myxicola infundibulum on the side of a dock. The colony is about 30 cm across and each funnel-like set of radioles is about 2.5-3 cm across. The entire colony is a ball of mucus that remains when the animals withdraw rapidly into their slime tubes. (Photo by: Dave Cowles, July 2014)
The body of the worm is buried in the sand - what you can see here is the feeding filter. They normally retract in the blink of an eye but this one was a bit slow...