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Example sentences for: ecdysozoa
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The traditional view is that arthropods are more closely related to annelids than to nematodes, but some recent molecular phylogenies place nematodes and arthropods together in a high-level taxon named Ecdysozoa, which does not include annelids [ 24 25 ] . Other molecular studies give conflicting results [ 26 27 ] . Regardless of the evolutionary relationship between Nematoda and Arthropoda, C. elegans and Drosophila remain useful and valid models for our analyses, and the relationships shown in Figure 1are consistent with both hypotheses.
Support for Coelomata was weakest with the fastest evolving proteins (which also showed compositional heterogeneity), indicating that Ecdysozoa, not Coelomata, may be the result of a rate bias, compositional bias, or other artifact.
The Coelomata hypothesis was significantly supported (≥ 97% bootstrap support, posterior probabilities = 1.0; Ecdysozoa rejected by SH test, P < 0.006; Hypothesis III rejected by SH test, P < 0.027) using either a genus in a different order, Brugia (18 proteins), or Trichinella (six proteins) (Fig.
If nematodes cluster basally because of long-branch attraction, then the strongest support for Ecdysozoa should be obtained with the slowest evolving proteins.
Using the Shimodaira-Hasegawa (SH) test [ 17 ] , this maximum likelihood topology was significantly different from the alternative hypotheses of Ecdysozoa ( P < 0.001) and Hypothesis III ( P < 0.001).