It has a relatively weak foothold on the rocks at low tide, and individuals can frequently be found lying near the base of a rock from which they have fallen at low tide. Individuals are not gregarious, and a study on the Oregon coast found that marked individuals remain within 65.6 ft (20 m) of the point of release even after two years of time. They often harbor a commensal polychaete worm, the scaleworm (Arctonoe vittata), ven-trally in the pallial groove (mantle cavity) on one side of the foot. The commensal feeds on plankton and detritus brought in by the respiratory currents of the host.
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