Are the Platyhelminthes a monophyletic primitive group? An assessment using 18S rDNA sequences.

@article{Carranza1997AreTP,
  title={Are the Platyhelminthes a monophyletic primitive group? An assessment using 18S rDNA sequences.},
  author={Salvador Carranza and Jaume Bagu{\~n}{\'a} and Marta Riutort},
  journal={Molecular biology and evolution},
  year={1997},
  volume={14 5},
  pages={485-97}
}
In most zoological textbooks, Platyhelminthes are depicted as an early-emerging clade forming the likely sister group of all the other Bilateria. Other phylogenetic proposals see them either as the sister group of most of the Protostomia or as a group derived from protostome coelomate ancestors by progenesis. The main difficulty in their correct phylogenetic placing is the lack of convincing synapomorphies for all Platyhelminthes, which may indicate that they are polyphyletic. Moreover, their… CONTINUE READING
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