Systematics and Taxonomy
Several molecular studies carried out since then have questioned the monophyly of the Phyllodocida, although it is recognized that none of these studies have very complete taxon sampling (Rousset et al. 2006, and references within). It has been difficult to root the polychaete tree, and it has been suggested that the root of the polychaetes lies within the Phyllodocida, rendering this group paraphyletic (Rouse and Pleijel, 2001)
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