Dental anatomy of the apex predator Sinraptor Dongi (Theropoda: Allosauroidea) from the late Jurassic of China
| Autor: | Fenglu Han, Christophe Hendrickx, Josef Stiegler, Jonah N. Choiniere, Philip J. Currie, Xiao-Chun Wu, Xing Xu |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
010506 paleontology Dental anatomy medicine.medical_treatment DENTICLE Theropoda 010603 evolutionary biology 01 natural sciences TOOTH Crown (dentistry) Sinraptor purl.org/becyt/ford/1 [https] purl.org/becyt/ford/1.5 [https] stomatognathic system medicine THEROPOD 0105 earth and related environmental sciences Apex predator biology Holotype Anatomy CROWN biology.organism_classification stomatognathic diseases General Earth and Planetary Sciences Shishugou Formation Allosauroidea DINOSAUR Geology |
| Zdroj: | CONICET Digital (CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas instacron:CONICET |
| DOI: | 10.1139/cjes-2019-0231 |
| Popis: | The dental morphology of the holotype of the theropod Sinraptor dongi from the Jurassic Shishugou Formation of China is comprehensively described. We highlight a combination of dental features that appear to be restricted to Sinraptor: (i) crowns with denticulated mesial and distal carinae extending from the root and an irregular surface texture on the enamel; (ii) a D- to salinon-shaped cross-sectional outline at the crown base in mesialmost teeth; (iii) mesial crowns with mesial carinae spiraling mesiolingually and lingually positioned longitudinal groove adjacent to the mesial carina; and (iv) particularly labiolingually compressed lateral teeth with weakly labially deflected distal carinae, flat to concave basocentral surfaces of the labial margins of the crowns, and horizontally elongated distal denticles showing short to well-developed interdenticular sulci. Using cladistic, multivariate, discriminant, and cluster analyses, we demonstrate that the dentition of Sinraptor is relatively similar to that of ceratosaurids, megalosauroids, and other allosauroids and is particularly close to that of Allosaurus. The dental anatomy of Sinraptor and Allosaurus, which differs mainly in the labiolingual compression of the lateral crowns and in the number of premaxillary teeth, shows adaptations towards a predatory lifestyle, including premaxillary teeth capable of enduring tooth-tobone contact and crowns with widely separated mesial and distal carinae capable of inflicting widely open wounds. Fil: Hendrickx, Christophe Marie Fabian. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - Tucumán. Unidad Ejecutora Lillo; Argentina Fil: Stiegler, Josef. The George Washington University; Estados Unidos Fil: Currie, Philip J.. University of Alberta; Canadá Fil: Han, Fenglu. University of Geoscience; China Fil: Xu, Xing. Chinese Academy of Sciences; República de China Fil: Choiniere, Jonah N.. University of the Witwatersrand; Sudáfrica Fil: Wu, Xiao Chung. Canadian Museum of Nature; Canadá |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|