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. 2011 Sep 28;6(9):e25186. doi: 10.1371/journal.pone.0025186

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Campione, Evans.

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) Revised biostratigraphic ranges of edmontosaur species during the latest Cretaceous. Based on our results either a cladogenetic (left) or anagenetic mode (right) of evolution is possible for this genus. (B) Results from the morphometric analysis including virtually all hadrosaurid skulls known from the latest Cretaceous (Figures 2 and S3A). The minimum convex polygons represent specimens known from the three time intervals described in the text. The centroid for each cluster and 95% confidence intervals is marked by an ‘X’ and the dotted lines. (C) Pattern of hadrosaurid morphological disparity, as measured by Foote's Disparity Metric, from 73 to 65 Ma, which shows a significant drop from the early to late Maastrichtian.