Gary L. Hendrickson, Newton Kingston, Cercaria laramiensis sp. n., a Freshwater Zygocercous Cercaria from Physa gyrina Say, with a Discussion of Cercarial Aggregation, The Journal of Parasitology, Vol. 60, No. 5 (Oct., 1974), pp. 777-781
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Hendrickson et al. (1974) studied this question.
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