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Cutler, Edward B.; Cutler, Norma J. (1985). A revision of the genera Sipunculus and Xenosiphon (Sipuncula). Zoological Journal of the Linnean Society. 85: 219-246.
Cutler, Edward B.; Cutler, Norma J. (1985). A revision of the genera Sipunculus and Xenosiphon (Sipuncula). Zoological Journal of the Linnean Society. 85: 219-246.