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Michael E. Smith, Distribution Patterns and Seasonal Occurrence of Rhabdostyla sp. (Peritricha: Epistylididae) on Dero nivea (Oligochaeta: Naididae), The American Midland Naturalist, Vol. 116, No. 2 (Oct., 1986), pp. 348-355
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Michael E. Smith (1986) studied this question.
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