Origin of the Metazoa.

  title={Origin of the Metazoa.},
  author={James A. Lake},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  volume={87 2},
  • James A. Lake
  • Published 1990 in
    Proceedings of the National Academy of Sciences…
The origin of the multicellular animals has been investigated by rate invariant analysis of 18S rRNA sequences. These analyses indicate that (i) the Metazoa is a monophyletic taxon; (ii) the Deuterostomia is a monophyletic taxon; (iii) the Annelida-Mollusca lineage is the sister group of an arthropod subgroup; and (iv) the last common ancestor of the Annelida-Mollusca lineage is most parsimoniously derived from a segmented, hemocoelic ancestor with an open circulatory system. 

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