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Harley J. Van Cleave, Wilbur L. Bullock, Morphology of Neoechinorhynchus emydis, a Typical Representative of the Eoacanthocephala. I. The Praesoma, Transactions of the American Microscopical Society, Vol. 69, No. 3 (Jul., 1950), pp. 288-308
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Cleave et al. (1950) studied this question.
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