Robert P. Higgins, Taxonomy and Postembryonic Development of the Cryptorhagae, a New Suborder for the Mesopsammic Kinorhynch Genus Cateria, Transactions of the American Microscopical Society, Vol. 87, No. 1 (Jan., 1968), pp. 21-39
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Robert P. Higgins (1968) studied this question.
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