Developmental and evolutionary novelty in the serrated teeth of theropod dinosaurs

  title={Developmental and evolutionary novelty in the serrated teeth of theropod dinosaurs},
  author={Kirstin S. Brink and Robert R. Reisz and Aaron R H Leblanc and RongSeng Chang and Y. C. Lee and Cheng-Cheng Chiang and Timothy Huang and David C. Evans},
  journal={Scientific Reports},
Tooth morphology and development can provide valuable insights into the feeding behaviour and evolution of extinct organisms. The teeth of Theropoda, the only clade of predominantly predatory dinosaurs, are characterized by ziphodonty, the presence of serrations (denticles) on their cutting edges. Known today only in varanid lizards, ziphodonty is much more pervasive in the fossil record. Here we present the first model for the development of ziphodont teeth in theropods through histological… 

Convergent dental adaptations in the serrations of hypercarnivorous synapsids and dinosaurs

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Tooth histology and development in the "middle" Cretaceous ornithischian dinosaur Changchunsaurus parvus is described, and wavy enamel is suggested to have evolved in association with a shearing-type dentition in a roughly symmetrically-enameled crown.

Amniote Dental Histology, Development, and Variation: Perspectives From the Fossil Record

By comparing histological sections of a large sample of modern and extinct amniotes, this thesis establishes tooth tissue homology across several major amniote groups and shows that even mammals and crocodilians possess the most complex forms of tooth attachment.

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Hidden dental diversity in the oldest terrestrial apex predator Dimetrodon.

A time-calibrated phylogenetic analysis indicates that changes in dental morphology occur in the absence of any significant changes in skull morphology, suggesting that the morphological change is associated with changes in feeding style and trophic interactions in these ecosystems.


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Convergent evolution of the maxilla-dental-complex among carnivorous archosaurs

It is proposed that increases in the length of teeth, and the presumed increase in the depth of penetration by the teeth, are associated with an increased resistance to sagittal (dorso-ventral) bending of the skull for all sizes of carnivorous archosaurs.

A Functional Explanation for Denticulation in Theropod Dinosaur Teeth

  • D. D'Amore
  • Environmental Science
    Anatomical record
  • 2009
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The development of complex tooth shape in reptiles

Whether the processes used to form such morphologies are conserved between divergent lizards and whether the underlying mechanisms share similarities with those of mammals is discussed.

Semiaquatic adaptations in a giant predatory dinosaur

Adaptations for a semiaquatic lifestyle in the dinosaur Spinosaurus aegyptiacus are described, including retraction of the fleshy nostrils to a position near the mid-region of the skull and an elongate neck and trunk that shift the center of body mass anterior to the knee joint.


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On the Occurrence of Exceptionally Large Teeth of Troodon (Dinosauria: Saurischia) from the Late Cretaceous of Northern Alaska

Abstract Exceptionally large teeth attributable to the theropod genus Troodon are abundant in Upper Cretaceous rocks (Campanian–Maastrichtian) of northern Alaska. The dominance of low-angle light in

The Evolution of Extreme Hypercarnivory in Metriorhynchidae (Mesoeucrocodylia: Thalattosuchia) Based on Evidence from Microscopic Denticle Morphology

A cladistic analysis shows that ziphodont dentition may have evolved independently in Dakosaurus and Geosaurus, or been acquired earlier by their common ancestor and secondarily lost in Torvoneustes and related taxa.