Morphological and functional diversity in therizinosaur claws and the implications for theropod claw evolution
Identifieur interne : 000368 ( Pmc/Curation ); précédent : 000367; suivant : 000369Morphological and functional diversity in therizinosaur claws and the implications for theropod claw evolution
Auteurs : Stephan LautenschlagerSource :
- Proceedings of the Royal Society B: Biological Sciences [ 0962-8452 ] ; 2014.
Abstract
Therizinosaurs are a group of herbivorous theropod dinosaurs from the Cretaceous of North America and Asia, best known for their iconically large and elongate manual claws. However, among Therizinosauria, ungual morphology is highly variable, reflecting a general trend found in derived theropod dinosaurs (Maniraptoriformes). A combined approach of shape analysis to characterize changes in manual ungual morphology across theropods and finite-element analysis to assess the biomechanical properties of different ungual shapes in therizinosaurs reveals a functional diversity related to ungual morphology. While some therizinosaur taxa used their claws in a generalist fashion, other taxa were functionally adapted to use the claws as grasping hooks during foraging. Results further indicate that maniraptoriform dinosaurs deviated from the plesiomorphic theropod ungual morphology resulting in increased functional diversity. This trend parallels modifications of the cranial skeleton in derived theropods in response to dietary adaptation, suggesting that dietary diversification was a major driver for morphological and functional disparity in theropod evolution.
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DOI: 10.1098/rspb.2014.0497
PubMed: 24807260
PubMed Central: 4024305
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<front><journal-meta><journal-id journal-id-type="nlm-ta">Proc Biol Sci</journal-id><journal-id journal-id-type="iso-abbrev">Proc. Biol. Sci</journal-id><journal-id journal-id-type="publisher-id">RSPB</journal-id><journal-id journal-id-type="hwp">royprsb</journal-id><journal-title-group><journal-title>Proceedings of the Royal Society B: Biological Sciences</journal-title></journal-title-group><issn pub-type="ppub">0962-8452</issn><issn pub-type="epub">1471-2954</issn><publisher><publisher-name>The Royal Society</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">24807260</article-id><article-id pub-id-type="pmc">4024305</article-id><article-id pub-id-type="doi">10.1098/rspb.2014.0497</article-id><article-id pub-id-type="publisher-id">rspb20140497</article-id><article-categories><subj-group subj-group-type="hwp-journal-coll"><subject>1001</subject><subject>25</subject><subject>70</subject><subject>144</subject></subj-group><subj-group subj-group-type="heading"><subject>Research Articles</subject></subj-group></article-categories><title-group><article-title>Morphological and functional diversity in therizinosaur claws and the implications for theropod claw evolution</article-title><alt-title alt-title-type="short">Theropod claw evolution and function</alt-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Lautenschlager</surname><given-names>Stephan</given-names></name><xref ref-type="corresp" rid="cor1"></xref></contrib></contrib-group><aff><addr-line>School of Earth Sciences</addr-line>,<institution>University of Bristol</institution>,<addr-line>Bristol BS8 1RJ</addr-line>,<country>UK</country></aff><author-notes><corresp id="cor1">e-mail: <email>glzsl@bristol.ac.uk</email></corresp></author-notes><pub-date pub-type="ppub"><day>22</day><month>6</month><year>2014</year></pub-date><volume>281</volume><issue>1785</issue><elocation-id>20140497</elocation-id><history><date date-type="received"><day>1</day><month>3</month><year>2014</year></date><date date-type="accepted"><day>2</day><month>4</month><year>2014</year></date></history><permissions><copyright-statement>© 2014 The Author(s) Published by the Royal Society. All rights reserved.</copyright-statement><copyright-year>2014</copyright-year></permissions><self-uri content-type="pdf" xlink:type="simple" xlink:href="rspb20140497.pdf"></self-uri><abstract><p>Therizinosaurs are a group of herbivorous theropod dinosaurs from the Cretaceous of North America and Asia, best known for their iconically large and elongate manual claws. However, among Therizinosauria, ungual morphology is highly variable, reflecting a general trend found in derived theropod dinosaurs (Maniraptoriformes). A combined approach of shape analysis to characterize changes in manual ungual morphology across theropods and finite-element analysis to assess the biomechanical properties of different ungual shapes in therizinosaurs reveals a functional diversity related to ungual morphology. While some therizinosaur taxa used their claws in a generalist fashion, other taxa were functionally adapted to use the claws as grasping hooks during foraging. Results further indicate that maniraptoriform dinosaurs deviated from the plesiomorphic theropod ungual morphology resulting in increased functional diversity. This trend parallels modifications of the cranial skeleton in derived theropods in response to dietary adaptation, suggesting that dietary diversification was a major driver for morphological and functional disparity in theropod evolution.</p></abstract><kwd-group><kwd>Theropoda</kwd><kwd>shape analysis</kwd><kwd>finite-element analysis</kwd><kwd>functional morphology</kwd></kwd-group><custom-meta-group><custom-meta><meta-name>cover-date</meta-name><meta-value>June 22, 2014</meta-value></custom-meta></custom-meta-group></article-meta></front></pmc></record>Pour manipuler ce document sous Unix (Dilib)
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