Clade-based calculations of MDI values.

<p>Comparison of the morphological disparity index (MDI) derived through the analysis of disparity through time (DTT) plots of individual clades. The MDI values represent the overall difference in disparity between the observed and the unconstrained null hypothesis (see Methods and <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0055629#pone-0055629-g007" target="_blank">Figure 7</a>). Values of MDI below zero are indicate that disparity tends to be distributed among subclades, while MDI values above zero indicate that disparity tends to be distributed within subclades.