Donald M. Spoon, George B. Chapman, Ruth S. Cheng, Sandra F. Zane, Observations on the Behavior and Feeding Mechanisms of the Suctorian Heliophrya erhardi (Rieder) Matthes Preying on Paramecium, Transactions of the American Microscopical Society, Vol. 95, No. 3 (Jul., 1976), pp. 443-462
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Spoon et al. (1976) studied this question.