Phylogenetic tree reconstruction using maximum likelihood (PhyML). Numbers at internal nodes represent bootstrap values. Syndermata are shown as a spiralian taxon, with a sistergroup relationship to Platyhelminthes. Moreover, Eurotatoria appear paraphyletic, with Bdelloidea being more closely related to Acanthocephala than to Monogononta.
Witek et al. BMC Evolutionary Biology 2008 8:345 doi:10.1186/1471-2148-8-345