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The oldest record of Alvarezsauridae (Dinosauria: Theropoda) in the Northern Hemisphere
Procoelous caudal vertebrae, a carpometacarpus with a hypertrophied metacarpal II, and robust proximal and ungual phalanges of manual digit II of a small theropod dinosaur from the Upper Cretaceous (Turonian) Bissekty Formation at Dzharakuduk, Uzbekistan, show unequivocal synapomorphies of the clade...
Autores principales: | , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Public Library of Science
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5656310/ https://www.ncbi.nlm.nih.gov/pubmed/29069094 http://dx.doi.org/10.1371/journal.pone.0186254 |
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author | Averianov, Alexander Sues, Hans-Dieter |
author_facet | Averianov, Alexander Sues, Hans-Dieter |
author_sort | Averianov, Alexander |
collection | PubMed |
description | Procoelous caudal vertebrae, a carpometacarpus with a hypertrophied metacarpal II, and robust proximal and ungual phalanges of manual digit II of a small theropod dinosaur from the Upper Cretaceous (Turonian) Bissekty Formation at Dzharakuduk, Uzbekistan, show unequivocal synapomorphies of the clade Alvarezsauridae and thus are referred to it. The caudal vertebrae have a unique longitudinal canal within the neural arch. The carpometacarpus, with metacarpal III occupying about one third of the width of the carpometacarpus, shows the most plesiomorphic stage of the evolution of the forelimb among known alvarezsaurids. The proximal phalanx of manual digit II differs from the corresponding bone in Parvicursorinae in having a less asymmetrical proximal articular surface without a dorsal process and short ventral ridges. The ungual phalanx of manual digit II has laterally open ventral foramina. The Bissekty alvarezsaurid possibly represents a basal parvicursorine and is the stratigraphically oldest known alvarezsaurid in Asia known to date. |
format | Online Article Text |
id | pubmed-5656310 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | Public Library of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-56563102017-11-09 The oldest record of Alvarezsauridae (Dinosauria: Theropoda) in the Northern Hemisphere Averianov, Alexander Sues, Hans-Dieter PLoS One Research Article Procoelous caudal vertebrae, a carpometacarpus with a hypertrophied metacarpal II, and robust proximal and ungual phalanges of manual digit II of a small theropod dinosaur from the Upper Cretaceous (Turonian) Bissekty Formation at Dzharakuduk, Uzbekistan, show unequivocal synapomorphies of the clade Alvarezsauridae and thus are referred to it. The caudal vertebrae have a unique longitudinal canal within the neural arch. The carpometacarpus, with metacarpal III occupying about one third of the width of the carpometacarpus, shows the most plesiomorphic stage of the evolution of the forelimb among known alvarezsaurids. The proximal phalanx of manual digit II differs from the corresponding bone in Parvicursorinae in having a less asymmetrical proximal articular surface without a dorsal process and short ventral ridges. The ungual phalanx of manual digit II has laterally open ventral foramina. The Bissekty alvarezsaurid possibly represents a basal parvicursorine and is the stratigraphically oldest known alvarezsaurid in Asia known to date. Public Library of Science 2017-10-25 /pmc/articles/PMC5656310/ /pubmed/29069094 http://dx.doi.org/10.1371/journal.pone.0186254 Text en https://creativecommons.org/publicdomain/zero/1.0/ This is an open access article, free of all copyright, and may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose. The work is made available under the Creative Commons CC0 (https://creativecommons.org/publicdomain/zero/1.0/) public domain dedication. |
spellingShingle | Research Article Averianov, Alexander Sues, Hans-Dieter The oldest record of Alvarezsauridae (Dinosauria: Theropoda) in the Northern Hemisphere |
title | The oldest record of Alvarezsauridae (Dinosauria: Theropoda) in the Northern Hemisphere |
title_full | The oldest record of Alvarezsauridae (Dinosauria: Theropoda) in the Northern Hemisphere |
title_fullStr | The oldest record of Alvarezsauridae (Dinosauria: Theropoda) in the Northern Hemisphere |
title_full_unstemmed | The oldest record of Alvarezsauridae (Dinosauria: Theropoda) in the Northern Hemisphere |
title_short | The oldest record of Alvarezsauridae (Dinosauria: Theropoda) in the Northern Hemisphere |
title_sort | oldest record of alvarezsauridae (dinosauria: theropoda) in the northern hemisphere |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5656310/ https://www.ncbi.nlm.nih.gov/pubmed/29069094 http://dx.doi.org/10.1371/journal.pone.0186254 |
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