plosone-phylo
pone.0025186.g007
Biostratigraphy and evolution of edmontosaurs and hadrosaurid disparity during latest Cretaceous.
(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.
pone.0025186.g007
Biostratigraphy and evolution of edmontosaurs and hadrosaurid disparity during latest Cretaceous.
(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.