Dispersal and diversity in the earliest North American sauropodomorph dinosaurs, with a description of a new taxon

dc.contributor.authorRowe, Timothy,B.
dc.contributor.authorSues, Hans-Dieter
dc.contributor.authorReisz, Robert R.
dc.date.accessioned2012-02-03T20:47:10Z
dc.date.available2012-02-03T20:47:10Z
dc.date.issued2011
dc.description.abstractSauropodomorph dinosaurs originated in the Southern Hemisphere in the Middle or Late Triassic and are commonly portrayed as spreading rapidly to all corners of Pangaea as part of a uniform Late Triassic to Early Jurassic cosmopolitan dinosaur fauna. Under this model, dispersal allegedly inhibited dinosaurian diversification, while vicariance and local extinction enhanced it. However, apomorphy-based analyses of the known fossil record indicate that sauropodomorphs were absent in North America until the Early Jurassic, reframing the temporal context of their arrival. We describe a new taxon from the Kayenta Formation of Arizona that comprises the third diagnosable sauropodomorph from the Early Jurassic of North America. We analysed its relationships to test whether sauropodomorphs reached North America in a single sweepstakes event or in separate dispersals. Our finding of separate arrivals by all three taxa suggests dispersal as a chief factor in dinosaurian diversification during at least the early Mesozoic. It questions whether a 'cosmopolitan' dinosaur fauna ever existed, and corroborates that vicariance, extinction and dispersal did not operate uniformly in time or under uniform conditions during the Mesozoic. Their relative importance is best measured in narrow time slices and circumscribed geographical regions.
dc.format.extent1044–1053
dc.identifier0962-8452
dc.identifier.citationRowe, Timothy,B., Sues, Hans-Dieter, and Reisz, Robert R. 2011. "<a href="https://repository.si.edu/handle/10088/17624">Dispersal and diversity in the earliest North American sauropodomorph dinosaurs, with a description of a new taxon</a>." <em>Proceedings of the Royal Society B: Biological Sciences</em>, 278, (1708) 1044–1053. <a href="https://doi.org/10.1098/rspb.2010.1867">https://doi.org/10.1098/rspb.2010.1867</a>.
dc.identifier.issn0962-8452
dc.identifier.urihttp://hdl.handle.net/10088/17624
dc.relation.ispartofProceedings of the Royal Society B: Biological Sciences 278 (1708)
dc.titleDispersal and diversity in the earliest North American sauropodomorph dinosaurs, with a description of a new taxon
dc.typearticle
sro.description.unitNH-Paleobiology
sro.description.unitNMNH
sro.identifier.doi10.1098/rspb.2010.1867
sro.identifier.itemID98710
sro.identifier.refworksID77348
sro.identifier.urlhttps://repository.si.edu/handle/10088/17624

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