Xenacoelomorpha is the sister group to Nephrozoa

@article{Cannon2016XenacoelomorphaIT,
  title={Xenacoelomorpha is the sister group to Nephrozoa},
  author={J. Cannon and Bruno C. Vellutini and Julian P. S. Smith and F. Ronquist and U. Jondelius and A. Hejnol},
  journal={Nature},
  year={2016},
  volume={530},
  pages={89-93}
}
The position of Xenacoelomorpha in the tree of life remains a major unresolved question in the study of deep animal relationships. [...] Key Result Here we show robust phylogenomic support for Xenacoelomorpha as the sister taxon of Nephrozoa. Our phylogenetic analyses, based on 11 novel xenacoelomorph transcriptomes and using different models of evolution under maximum likelihood and Bayesian inference analyses, strongly corroborate this result.Expand
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Deep gastropod relationships resolved
TLDR
The time of differentiation of the embryonic 4d cell (mesentoblast, responsible for mesoderm formation), differs between the two major clades, highlighting the degree of conservation and significance of development in the evolution of gastropods, as it is also known for spiralian animals more broadly. Expand
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