Data from: Platyzoan paraphyly based on phylogenomic data supports a non-coelomate ancestry of Spiralia

Based on molecular data three major clades have been recognized within Bilateria: Deuterostomia, Ecdysozoa and Spiralia. Within Spiralia, small-sized and simply organized animals such as flatworms, gastrotrichs and gnathostomulids have recently been grouped together as Platyzoa. However, the representation of putative platyzoans was low in the respective molecular phylogenetic studies, in terms of both, taxon number and sequence data. Furthermore, increased substitution rates in platyzoan taxa raised the possibility that monophyletic Platyzoa represents an artefact due to long-branch attraction. In order to overcome such problems, we employed a phylogenomic approach, thereby substantially i…