Very small organic particles appear to be the primary food source of cephalocarids. Using the metachronal beat of the thoracic limbs, they pass these small organic particles to the mouth. As the limbs separate, particle-laden fluids are pulled through the interlimb space toward the mid-ventral food groove. As adjacent limbs come together, the fluid is pushed away from the body and particles are retained on the setae of the endites. Turbulence removes particles from the setae and into the food groove. It may be that mucus secreted from glands in the endites helps to bind the particles for ingestion.
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