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Stephen, A. C. (1965). A revision of the classification of the phylum Sipuncula. Annals and Magazine of Natural History. (Series 13) 7 (80): 457–462.
Stephen, A. C. (1965). A revision of the classification of the phylum Sipuncula. Annals and Magazine of Natural History. (Series 13) 7 (80): 457–462.
