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Libbie H. Hyman, North American Triclad Turbellaria. IX. The Priority of Dugesia Girard 1850 over Euplanaria Hesse 1897 with Notes on American Species of Dugesia, Transactions of the American Microscopical Society, Vol. 58, No. 3 (Jul., 1939), pp. 264-275
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Libbie H. Hyman (1939) studied this question.
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