uu.seUppsala University Publications
Change search
ReferencesLink to record
Permanent link

Direct link
Cranial Growth and Variation in Edmontosaurs (Dinosauria: Hadrosauridae): Implications for Latest Cretaceous Megaherbivore Diversity in North America
Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, Ontario, Canada.
Royal Ontario Museum.
2011 (English)In: PLoS ONE, ISSN 1932-6203, Vol. 6, no 9, e25186- p.Article in journal (Refereed) Published
Abstract [en]

The well-sampled Late Cretaceous fossil record of North America remains the only high-resolution dataset for evaluating patterns of dinosaur diversity leading up to the terminal Cretaceous extinction event. Hadrosaurine hadrosaurids (Dinosauria: Ornithopoda) closely related to Edmontosaurus are among the most common megaherbivores in latest Campanian and Maastrichtian deposits of western North America. However, interpretations of edmontosaur species richness and biostratigraphy have been in constant flux for almost three decades, although the clade is generally thought to have undergone a radiation in the late Maastrichtian. We address the issue of edmontosaur diversity for the first time using rigorous morphometric analyses of virtually all known complete edmontosaur skulls. Results suggest only two valid species, Edmontosaurus regalis from the late Campanian, and E. annectens from the late Maastrichtian, with previously named taxa, including the controversial Anatotitan copei, erected on hypothesized transitional morphologies associated with ontogenetic size increase and allometric growth. A revision of North American hadrosaurid taxa suggests a decrease in both hadrosaurid diversity and disparity from the early to late Maastrichtian, a pattern likely also present in ceratopsid dinosaurs. A decline in the disparity of dominant megaherbivores in the latest Maastrichtian interval supports the hypothesis that dinosaur diversity decreased immediately preceding the end Cretaceous extinction event.

Place, publisher, year, edition, pages
2011. Vol. 6, no 9, e25186- p.
National Category
Evolutionary Biology Zoology
Research subject
Biology with specialization in Evolutionary Organismal Biology
URN: urn:nbn:se:uu:diva-217229DOI: 10.1371/journal.pone.0025186ISI: 000295936900030OAI: oai:DiVA.org:uu-217229DiVA: diva2:692560
Available from: 2014-01-31 Created: 2014-01-31 Last updated: 2014-01-31Bibliographically approved

Open Access in DiVA

fulltext(1729 kB)131 downloads
File information
File name FULLTEXT01.pdfFile size 1729 kBChecksum SHA-512
Type fulltextMimetype application/pdf

Other links

Publisher's full text

Search in DiVA

By author/editor
Campione, Nicolas E.
In the same journal
Evolutionary BiologyZoology

Search outside of DiVA

GoogleGoogle Scholar
Total: 131 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 161 hits
ReferencesLink to record
Permanent link

Direct link