Covering response in sea urchins

Abstract

THE tendency of many species of sea urchins to pick up particles and debris with their spines and tube feet, and to move and then hold the particles on their aboral surface is well known. Functional bases (decreasing the susceptibility to water or wave action, desiccation, light, or predation; supplying nutrients through skin digestion and absorption) have been ascribed to this “covering reaction”1–13.

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