Prismatic dental enamel in theropod dinosaurs

  title={Prismatic dental enamel in theropod dinosaurs},
  author={Eric Buffetaut and Yannicke Dauphin and Jeri J. Jaeger and Ml Martin and Jean-Michel Mazin and Huan Tong},
It is often claimed that reptilian tooth enamel exhibits a simple structure of parallel fibers perpendicular to the external surface of the tooth [1, 2], whereas mammalian enamel shows a more complex structure in which the fibers are assembled into distinct prisms. However, prismatic structures have been reported in the enamel of several reptiles: Triassic placodonts [3], the lizard Uromastyx [4], the Triassic mammal-like reptile Pachygenelus [5] and Alligator [6]. Our SEM studies indicate that… Expand
The evolution of dinosaur tooth enamel microstructure
  • Sunny H. Hwang
  • Biology, Medicine
  • Biological reviews of the Cambridge Philosophical Society
  • 2011
These new specimens provide new insights into the evolution of tooth enamel microstructure in dinosaurs, emphasizing the importance of thorough sampling within broadly inclusive clades, especially among their more basal members. Expand
Tooth enamel microstructure of Revueltosaurus and Krzyzanowskisaurus (Reptilia:Archosauria) from the Upper Triassic Chinle Group, USA: Implications for function, growth, and phylogeny
The first descriptions of the tooth enamel microstructure of two Late Triassic taxa, the crurotarsan Revueltosaurus callenderi Hunt and the putative ornithischian Krzyzanowskisaurus hunti (Heckert), are provided, supporting the hypothesis that they are closely related. Expand
Phylogenetic patterns of enamel microstructure in dinosaur teeth
It is revealed that phylogenetic constraints play a larger role in shaping enamel microstructure in reptiles than previously thought. Expand
Tooth development, histology, and enamel microstructure in Changchunsaurus parvus: Implications for dental evolution in ornithopod dinosaurs
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. Expand
Dental histology of Coelophysis bauri and the evolution of tooth attachment tissues in early dinosaurs
The occurrence of a tripartite periodontium in dinosaurs adds to the growing consensus that the presence of these tissues is the plesiomorphic condition for the major amniote clades and provides the first comparative framework for future studies of dinosaur periodontal development, tooth replacement, and histology. Expand
The development and evolution of mammalian enamel: structural and functional aspects
The modifications in enamel structure that occurred during mammalian evolution are reviewed, as well as the functional and cellular aspects related to these changes. Expand
Incremental growth of therizinosaurian dental tissues: implications for dietary transitions in Theropoda
A significant reduction in the rate of enamel apposition is recorded contrasted with increased relative enamel thickness between early and later diverging therizinosaurians that coincides with anatomical evidence for increased specializations to herbivory in the clade. Expand
Morphometry, Microstructure, and Wear Pattern of Neornithischian Dinosaur Teeth From the Upper Cretaceous Iharkút Locality (Hungary)
The first teeth that can provisionally be referred to the Ajkaceratops genus are presented and it is believed that the methodology discussed in this article will facilitate distinguishing ceratopsian and ornithopod teeth in other localities as well. Expand
Tetrapod Teeth: Diversity, Evolution, and Function
Teeth provide an excellent model system for understanding evolutionary change and how it has led to adaptive diversity across tetrapods. Their durability over geological timescales and their ubiquityExpand
Tooth development in a model reptile: functional and null generation teeth in the gecko Paroedura picta
The fate of the single generation of non‐functional (null generation) teeth is shown to be variable, with some teeth being expelled from the oral cavity, while others are incorporated into the functional bone and teeth, or are absorbed. Expand


Tooth Ultrastructure of Late Triassic Haramiyidae
Six molars of Haramiyidae from the French lower Rhaetic were examined and found to have had a structural pattern defined as "pre-prismatic", consisting of a repetitive pinnate orientation of the c-axes of apatite crystallites but without interprismating material. Expand
Enamel and dentine ultrastructure in the early Jurassic therian Kuehneotherium
Three fragmentary molars of Kuehneotherium from Wales were progressively abraded by grinding and studied by scanning electron microscopy, finding that inner dentine was permeated by numerous tubules not surrounded by peritubular dentine but a peripheral dentine layer adjacent to the enamel-dentine junction was atubular. Expand
Correlation of ameloblast size with enamel prism Pattern: use of scanning electron microscope to make surface area measurements
  • A. Boyde
  • Materials Science, Medicine
  • Zeitschrift für Zellforschung und Mikroskopische Anatomie
  • 2004
The largest ameloblasts, covering 2 to 3 times the area of the former group, were found to be characteristic for Pattern 3 prism formation, and these size differences help to explain differences in the degree of divergence of the crystallites within prism domains, which can now be understood to increase with increasing depression diameter. Expand
however (for it was the literal soul of the life of the Redeemer, John xv. io), is the peculiar token of fellowship with the Redeemer. That love to God (what is meant here is not God’s love to men)Expand
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Polarization Microscopy of Dental Tissue
  • Oxford: Pergamon
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  • Zellforsch. 93, 583
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