Fig. 3. Food capture, ingestion and digestion. (A) Ciliary beating drives water orally past the extended tentacles (arrows) and causes the animal to glide slowly through the water, bringing the tentacles into contact with a copepod. (B) Tentacular contraction and flexion brings the prey to the margin while the manubrium points across to it with flared lips. (C) Peduncle (p) and manubrium (m) of an unfed animal at rest. (D) Lateral flexion (pointing) to a site where food is held by the tentacles. (E,F) Changes in the diameter of the manubrium during peristalsis in a fed animal. (G) Lip flaring evoked by a shock from a stimulating electrode (s) on a peduncular radial canal.

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