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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, E-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
Identifiers
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: 2017-12-06Bibliographically approved

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Campione, Nicolas E.

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