Systematic searches for molecular synapomorphies in model metazoan genomes give some support for Ecdysozoa after accounting for the idiosyncrasies of Caenorhabditis elegans.

@article{Copley2004SystematicSF,
  title={Systematic searches for molecular synapomorphies in model metazoan genomes give some support for Ecdysozoa after accounting for the idiosyncrasies of Caenorhabditis elegans.},
  author={R. R. Copley and Patrick Aloy and Robert B. Russell and Maximilian J. Telford},
  journal={Evolution & development},
  year={2004},
  volume={6 3},
  pages={164-9}
}
There has been broad acceptance among evolutionary biologists of the Ecdysozoa hypothesis that, based principally on molecular phylogenetic studies of small and large subunit ribosomal RNA sequences, postulates a close relationship between molting taxa such as arthropods and nematodes. On the other hand, recent studies of as many as 100 additional genes do not support the Ecdysozoa hypothesis and instead favor the older Coelomata hypothesis that groups the coelomate arthropods with the… CONTINUE READING