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Annelid phylogeny and the status of Sipuncula and Echiura

Torsten H Struck*, Nancy Schult, Tiffany Kusen, Emily Hickman, Christoph Bleidorn, Damhnait McHugh and Kenneth M Halanych

BMC Evolutionary Biology 2007, 7:57  doi:10.1186/1471-2148-7-57