A cerianthid burrowing anemone builds a tube in the sediment out of secreted fine threads and mucus, which it can withdraw rapidly into and completely for protection.

A cerianthid burrowing anemone builds a tube in the sediment out of secreted fine threads and mucus, which it can withdraw rapidly into and completely for protection. Image courtesy of the NOAA Office of Ocean Exploration and Research, Gulf of Mexico 2017.

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