Anagenetic_centrosaurine_taxa.jpg
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Summary
| Description | Stratigraphic and temporal relationship of the centrosaurine taxa hypothesized as representing an anagenetic lineage, with the evolution of their parietal ornamentation, within their respective geological formations. Letters are colour coded by taxon to match transformation of parietal ornamentation listed. (a) Styracosaurus albertensis, (b) Stellasaurus ancellae, (c) and (c') Einiosaurus procurvicornis MOR 373 and MOR 456, respectively, indicating slight stratigraphic separation with associated morphological change of the P4 process, (d) Achelousaurus horneri, (e) Pachyrhinosaurus lakustai. Generalized stratigraphic columns are based on [18]. Relative taxon placement is based on stratigraphic occurrence of specimens within their respective geological formations and the temporal relationships of host strata based on [18] (see Material and methods and Discussion). Styracosaurus ovatus is omitted due to its uncertain stratigraphic placement within the Two Medicine Formation. Parietal line drawings used and modified from Evans and Ryan ([22] fig. 15), Public Library of Science (PLoS), used under Creative Commons Attribution 4.0. |
| Date | |
| Source | https://royalsocietypublishing.org/doi/full/10.1098/rsos.200284 |
| Author | John P. Wilson, Michael J. Ryanand David C. Evans |
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