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dc.contributor.author
LeBlanc, Aaron R. H.
dc.contributor.author
Apesteguía, Sebastián
dc.contributor.author
Larsson, Hans C. E.
dc.contributor.author
Caldwell, Michael Wayne
dc.date.available
2022-09-15T12:12:17Z
dc.date.issued
2020-05
dc.identifier.citation
LeBlanc, Aaron R. H.; Apesteguía, Sebastián; Larsson, Hans C. E.; Caldwell, Michael Wayne; Unique Tooth Morphology and Prismatic Enamel in Late Cretaceous Sphenodontians from Argentina; Cell Press; Current Biology; 30; 9; 5-2020; 1755-1761.e2
dc.identifier.issn
0960-9822
dc.identifier.uri
http://hdl.handle.net/11336/168855
dc.description.abstract
Mammals and reptiles have evolved divergent adaptations for processing abrasive foods. Mammals have occluding, diphyodont dentitions with taller teeth (hypsodonty), more complex occlusal surfaces, continuous tooth eruption, and forms of prismatic enamel that prolong the functional life of each tooth [1, 2]. The evolution of prismatic enamel in particular was a key innovation that made individual teeth more resilient to abrasion in early mammals [2–4]. In contrast, reptiles typically have thin, non-prismatic enamel, and shearing, polyphyodont dentitions with multi-cusped or serrated tooth crowns, multiple tooth rows, rapid tooth replacement rates, or batteries made of hundreds of teeth [5–9]. However, there are rare cases where reptiles have evolved alternative solutions to cope with abrasive diets. Here, we show that the combined effects of herbivory and an ancestral loss of tooth replacement in a lineage of extinct herbivorous sphenodontians, distant relatives of the modern tuatara (Sphenodon punctatus) [10], are associated with the evolution of wear-resistant and highly complex teeth. Priosphenodon avelasi, an extinct sphenodontian from the Cretaceous of Argentina, possesses a unique cone-in-cone dentition with overlapping generations of teeth forming a densely packed tooth file. Each tooth is anchored to its predecessor via a rearrangement of dental tissues that results in a novel enamel-to-bone tooth attachment. Furthermore, the compound occlusal surfaces, thickened enamel, and the first report of prismatic enamel in a sphenodontian are convergent strategies with those in some mammals, challenging the perceived simplicity of acrodont dentitions [11–15] and showcasing the reptilian capacity to produce complex and unusual dentitions.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Cell Press
dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
CONVERGENCE
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CRETACEOUS
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DENTITION
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ENAMEL
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HERBIVORY
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LEPIDOSAURIA
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PRIOSPHENODON
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SPHENODONTIA
dc.subject.classification
Paleontología
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Ciencias de la Tierra y relacionadas con el Medio Ambiente
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CIENCIAS NATURALES Y EXACTAS
dc.title
Unique Tooth Morphology and Prismatic Enamel in Late Cretaceous Sphenodontians from Argentina
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2022-09-15T02:15:52Z
dc.journal.volume
30
dc.journal.number
9
dc.journal.pagination
1755-1761.e2
dc.journal.pais
Estados Unidos
dc.description.fil
Fil: LeBlanc, Aaron R. H.. University of Alberta; Canadá
dc.description.fil
Fil: Apesteguía, Sebastián. Universidad Maimónides; Argentina. Fundación de Historia Natural Félix de Azara; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil
Fil: Larsson, Hans C. E.. McGill University; Canadá
dc.description.fil
Fil: Caldwell, Michael Wayne. University of Alberta; Canadá
dc.journal.title
Current Biology
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.cub.2020.02.071
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