Rice, Mary E. Division of Worms, Smithsonian Institution, Washington, DC.
Last reviewed:January 2021
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One of the minor groups of wormlike marine animals. Once linked with the Echiurida and the Sipunculida under the term Gephyrea, it has since been recognized as a separate phylum of the animal kingdom with uncertain zoological affinities. See also: Echiura; Sipuncula
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