An analysis of videotape recordings of larval feeding in the sea urchin Lytechinus pictus (Verrill)

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Abstract
Frame-by-frame analysis of videotapes of sea urchin larvae feeding on algal suspensions has shown that most algal cells entering the mouth are captured without reversal of the locomotory cilia. Low concentrations of the calcium blocker verapamil inhibit ciliary reversal without interfering with food capture, providing further evidence that reversals are of little significance in feeding. These observations suggest that the scan and trap theory of food capture does not apply to echinoderm larvae.