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Dispersal and diversity in the earliest North American sauropodomorph dinosaurs, with a description of a new taxon.
Proc Biol Sci. 2011 Apr 07; 278(1708):1044-53.PB

Abstract

Sauropodomorph 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.

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royalsocietypublishing.org
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Authors+Show Affiliations

Rowe TB
Jackson School of Geosciences, C1100, The University of Texas at Austin, Austin, TX 78712, USA. rowe@mail.utexas.edu
Sues HD
No affiliation info available
Reisz RR
No affiliation info available

MeSH

AnimalsArizonaBiodiversityBiological EvolutionBone and BonesDinosaursExtinction, BiologicalFossilsGeography

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

20926438

Citation

Rowe, Timothy B., et al. "Dispersal and Diversity in the Earliest North American Sauropodomorph Dinosaurs, With a Description of a New Taxon." Proceedings. Biological Sciences, vol. 278, no. 1708, 2011, pp. 1044-53.
Rowe TB, Sues HD, Reisz RR. Dispersal and diversity in the earliest North American sauropodomorph dinosaurs, with a description of a new taxon. Proc Biol Sci. 2011;278(1708):1044-53.
Rowe, T. B., Sues, H. D., & Reisz, R. R. (2011). Dispersal and diversity in the earliest North American sauropodomorph dinosaurs, with a description of a new taxon. Proceedings. Biological Sciences, 278(1708), 1044-53. https://doi.org/10.1098/rspb.2010.1867
Rowe TB, Sues HD, Reisz RR. Dispersal and Diversity in the Earliest North American Sauropodomorph Dinosaurs, With a Description of a New Taxon. Proc Biol Sci. 2011 Apr 7;278(1708):1044-53. PubMed PMID: 20926438.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Dispersal and diversity in the earliest North American sauropodomorph dinosaurs, with a description of a new taxon. AU - Rowe,Timothy B, AU - Sues,Hans-Dieter, AU - Reisz,Robert R, Y1 - 2010/10/06/ PY - 2010/10/8/entrez PY - 2010/10/12/pubmed PY - 2011/6/10/medline SP - 1044 EP - 53 JF - Proceedings. Biological sciences JO - Proc Biol Sci VL - 278 IS - 1708 N2 - Sauropodomorph 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. SN - 1471-2954 UR - https://www.unboundmedicine.com/medline/citation/20926438/Dispersal_and_diversity_in_the_earliest_North_American_sauropodomorph_dinosaurs_with_a_description_of_a_new_taxon_ L2 - https://royalsocietypublishing.org/doi/abs/10.1098/rspb.2010.1867?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub=pubmed DB - PRIME DP - Unbound Medicine ER -