Feeds only during high tide when the carapace is covered by water. Food is small and collected by filtering; animal opens operculum and extends the last three long pairs of cirri, which are spread and curved outward resembling a fan-shaped net. It rhythmically extends and retracts the cirri and collects material, transferring it to mouthparts. Cirri can do 33-37 beats per minute to collect food. Preyed on extensively by the dog whelk, Nucella lapillus, and the shanny, Lipophrys pholis.
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