Xenoturbella 's molluscan relatives⃛

@article{Norn1997XenoturbellaM,
  title={Xenoturbella 's molluscan relatives⃛},
  author={Michael Nor{\'e}n and Ulf Jondelius},
  journal={Nature},
  year={1997},
  volume={390},
  pages={31-32}
}
Despite detailed morphological studies, the phylogenetic relationships of Xenoturbella bocki Westblad 1949 have remained unclear. The marine, worm-like X. bocki was first described as an acoel flatworm. Later it was proposed to be a deuterostome, and most recently as the sister taxon of the Bilateria. Here we present DNA sequence data that place X. bocki within the protostome clade Eutrochozoa. 
The mitochondrial DNA of Xenoturbella bocki: genomic architecture and phylogenetic analysis
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A second complete mitochondrial genome of this species is sequenced and phylogenetic analyses based on the amino acid sequences of all 13 mitochondrial protein-coding genes and on its gene order confirm the deuterostome relationship of Xenoturbella. Expand
Zoology: War of the Worms
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⃛and molluscan embryogenesis
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A study of oogenesis in X. bocki is reported, which contradicts earlier hypotheses as to the phylogeny of the animal and instead suggests a molluscan relationship close to or within the protobranch bivalves. Expand
Xenacoelomorpha, a Key Group to Understand Bilaterian Evolution: Morphological and Molecular Perspectives
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What has been learned over the last decades on the morphology, genomics and phylogenetic relationships of the Xenacoelomorpha is revisited. Expand
New light on the enigmatic Xenoturbella (phylum uncertain): ontogeny and phylogeny
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References

⃛and molluscan embryogenesis
TLDR
A study of oogenesis in X. bocki is reported, which contradicts earlier hypotheses as to the phylogeny of the animal and instead suggests a molluscan relationship close to or within the protobranch bivalves. Expand