Edentulism, beaks, and biomechanical innovations in the evolution of theropod dinosaurs
Identifieur interne : 001176 ( Main/Exploration ); précédent : 001175; suivant : 001177Edentulism, beaks, and biomechanical innovations in the evolution of theropod dinosaurs
Auteurs : Stephan Lautenschlager [Royaume-Uni] ; Lawrence M. Witmer ; Perle Altangerel [Mongolie] ; Emily J. Rayfield [Royaume-Uni]Source :
- Proceedings of the National Academy of Sciences of the United States of America [ 0027-8424 ] ; 2013.
Descripteurs français
- KwdFr :
- MESH :
- anatomie et histologie : Bec, Dinosaures.
- physiologie : Bec, Comportement alimentaire, Dinosaures, Phénomènes biomécaniques, Vol animal.
- Animaux, Évolution biologique.
English descriptors
- KwdEn :
- MESH :
- anatomy & histology : Beak, Dinosaurs.
- physiology : Beak, Biomechanical Phenomena, Dinosaurs, Feeding Behavior, Flight, Animal.
- Animals, Biological Evolution.
Abstract
Edentulism and beaks (rhamphothecae) are distinguishing features among extant birds and are traditionally regarded as a response to weight-saving demands for the evolution of flight. However, keratin-covered beaks paralleled by edentulism appeared in non-avian theropod dinosaurs and as early as the Early Cretaceous. Here, high-resolution, digital biomechanical models of the skull of the Cretaceous therizinosaur
Url:
DOI: 10.1073/pnas.1310711110
PubMed: 24297877
PubMed Central: 3870693
Affiliations:
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Le document en format XML
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<front><div type="abstract" xml:lang="en"><title>Significance</title>
<p>Edentulism and beaks (rhamphothecae) are distinguishing features among extant birds and are traditionally regarded as a response to weight-saving demands for the evolution of flight. However, keratin-covered beaks paralleled by edentulism appeared in non-avian theropod dinosaurs and as early as the Early Cretaceous. Here, high-resolution, digital biomechanical models of the skull of the Cretaceous therizinosaur <italic>Erlikosaurus andrewsi</italic>
are used to investigate the functional significance of these morphological specialisations and adaptations occurring in non-avian, maniraptoriform dinosaurs. Results of finite-element analyses provide evidence that keratinous beaks play an important role in enhancing cranial stability by mitigation stress and strain during feeding and represent an evolutionary innovation developed early in derived theropod dinosaurs.</p>
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