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. 2011 Jun 28;6(6):e21206. doi: 10.1371/journal.pone.0021206

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McMahon et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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(A) Individual node comparison of molecular rate (pairwise sequence divergence / million years) versus morphological branch length (steps required under parsimony). (B) K-tree null distribution, with test-statistic indicated by arrow. (C) Distribution of molecular rate (left) and morphological branch length (right) variation. (D) Graphical summary of linear model assumptions: non-linearity of error (left) and heterogeneity of variance (right).