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Wear patterns and dental functioning in an Early Cretaceous stegosaur from Yakutia, Eastern Russia
Isolated stegosaurian teeth from the Early Cretaceous high-latitude (palaeolatitude estimate of N 62°- 66.5°) Teete locality in Yakutia (Eastern Siberia, Russia) are characterized by a labiolingually compressed, slightly asymmetrical and mesiodistally denticulated (9–14 denticles) crown, a pronounce...
Autores principales: | , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Public Library of Science
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7968641/ https://www.ncbi.nlm.nih.gov/pubmed/33730093 http://dx.doi.org/10.1371/journal.pone.0248163 |
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author | Skutschas, Pavel P. Gvozdkova, Vera A. Averianov, Alexander O. Lopatin, Alexey V. Martin, Thomas Schellhorn, Rico Kolosov, Petr N. Markova, Valentina D. Kolchanov, Veniamin V. Grigoriev, Dmitry V. Kuzmin, Ivan T. Vitenko, Dmitry D. |
author_facet | Skutschas, Pavel P. Gvozdkova, Vera A. Averianov, Alexander O. Lopatin, Alexey V. Martin, Thomas Schellhorn, Rico Kolosov, Petr N. Markova, Valentina D. Kolchanov, Veniamin V. Grigoriev, Dmitry V. Kuzmin, Ivan T. Vitenko, Dmitry D. |
author_sort | Skutschas, Pavel P. |
collection | PubMed |
description | Isolated stegosaurian teeth from the Early Cretaceous high-latitude (palaeolatitude estimate of N 62°- 66.5°) Teete locality in Yakutia (Eastern Siberia, Russia) are characterized by a labiolingually compressed, slightly asymmetrical and mesiodistally denticulated (9–14 denticles) crown, a pronounced ring-like cingulum, as well as a “complex network of secondary ridges”. The 63 teeth (found during on-site excavation in 2012, 2017–2019 and screen-washing in 2017–2019) most likely belong to one species of a derived (stegosaurine) stegosaur. Most of the teeth exhibit a high degree of wear and up to three wear facets has been observed on a single tooth. The prevalence of worn teeth with up to three wear facets and the presence of different types of facets (including steeply inclined and groove-like) indicate the tooth-tooth contact and precise dental occlusion in the Teete stegosaur. The microwear pattern (mesiodistally or slightly obliquely oriented scratches; differently oriented straight and curved scratches on some wear facets) suggest a complex jaw mechanism with palinal jaw motion. Histological analysis revealed that the Teete stegosaur is characterized by relatively short tooth formation time (95 days) and the presence of a “wavy enamel pattern”. Discoveries of a “wavy enamel pattern” in the Teete stegosaur, in a Middle Jurassic stegosaur from Western Siberia, and in the basal ceratopsian Psittacosaurus, suggest that this histological feature is common for different ornithischian clades, including ornithopods, marginocephalians, and thyreophorans. A juvenile tooth in the Teete sample indicates that stegosaurs were year-round residents and reproduced in high latitudes. The combination of high degree of tooth wear with formation of multiple wear facets, complex jaw motions, relatively short tooth formation time and possibly high tooth replacement rates is interpreted as a special adaptation for a life in high-latitude conditions or, alternatively, as a common stegosaurian adaptation making stegosaurs a successful group of herbivorous dinosaurs in the Middle Jurassic–Early Cretaceous and enabeling them to live in both low- and high-latitude ecosystems. |
format | Online Article Text |
id | pubmed-7968641 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | Public Library of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-79686412021-03-31 Wear patterns and dental functioning in an Early Cretaceous stegosaur from Yakutia, Eastern Russia Skutschas, Pavel P. Gvozdkova, Vera A. Averianov, Alexander O. Lopatin, Alexey V. Martin, Thomas Schellhorn, Rico Kolosov, Petr N. Markova, Valentina D. Kolchanov, Veniamin V. Grigoriev, Dmitry V. Kuzmin, Ivan T. Vitenko, Dmitry D. PLoS One Research Article Isolated stegosaurian teeth from the Early Cretaceous high-latitude (palaeolatitude estimate of N 62°- 66.5°) Teete locality in Yakutia (Eastern Siberia, Russia) are characterized by a labiolingually compressed, slightly asymmetrical and mesiodistally denticulated (9–14 denticles) crown, a pronounced ring-like cingulum, as well as a “complex network of secondary ridges”. The 63 teeth (found during on-site excavation in 2012, 2017–2019 and screen-washing in 2017–2019) most likely belong to one species of a derived (stegosaurine) stegosaur. Most of the teeth exhibit a high degree of wear and up to three wear facets has been observed on a single tooth. The prevalence of worn teeth with up to three wear facets and the presence of different types of facets (including steeply inclined and groove-like) indicate the tooth-tooth contact and precise dental occlusion in the Teete stegosaur. The microwear pattern (mesiodistally or slightly obliquely oriented scratches; differently oriented straight and curved scratches on some wear facets) suggest a complex jaw mechanism with palinal jaw motion. Histological analysis revealed that the Teete stegosaur is characterized by relatively short tooth formation time (95 days) and the presence of a “wavy enamel pattern”. Discoveries of a “wavy enamel pattern” in the Teete stegosaur, in a Middle Jurassic stegosaur from Western Siberia, and in the basal ceratopsian Psittacosaurus, suggest that this histological feature is common for different ornithischian clades, including ornithopods, marginocephalians, and thyreophorans. A juvenile tooth in the Teete sample indicates that stegosaurs were year-round residents and reproduced in high latitudes. The combination of high degree of tooth wear with formation of multiple wear facets, complex jaw motions, relatively short tooth formation time and possibly high tooth replacement rates is interpreted as a special adaptation for a life in high-latitude conditions or, alternatively, as a common stegosaurian adaptation making stegosaurs a successful group of herbivorous dinosaurs in the Middle Jurassic–Early Cretaceous and enabeling them to live in both low- and high-latitude ecosystems. Public Library of Science 2021-03-17 /pmc/articles/PMC7968641/ /pubmed/33730093 http://dx.doi.org/10.1371/journal.pone.0248163 Text en © 2021 Skutschas et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. |
spellingShingle | Research Article Skutschas, Pavel P. Gvozdkova, Vera A. Averianov, Alexander O. Lopatin, Alexey V. Martin, Thomas Schellhorn, Rico Kolosov, Petr N. Markova, Valentina D. Kolchanov, Veniamin V. Grigoriev, Dmitry V. Kuzmin, Ivan T. Vitenko, Dmitry D. Wear patterns and dental functioning in an Early Cretaceous stegosaur from Yakutia, Eastern Russia |
title | Wear patterns and dental functioning in an Early Cretaceous stegosaur from Yakutia, Eastern Russia |
title_full | Wear patterns and dental functioning in an Early Cretaceous stegosaur from Yakutia, Eastern Russia |
title_fullStr | Wear patterns and dental functioning in an Early Cretaceous stegosaur from Yakutia, Eastern Russia |
title_full_unstemmed | Wear patterns and dental functioning in an Early Cretaceous stegosaur from Yakutia, Eastern Russia |
title_short | Wear patterns and dental functioning in an Early Cretaceous stegosaur from Yakutia, Eastern Russia |
title_sort | wear patterns and dental functioning in an early cretaceous stegosaur from yakutia, eastern russia |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7968641/ https://www.ncbi.nlm.nih.gov/pubmed/33730093 http://dx.doi.org/10.1371/journal.pone.0248163 |
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