Dental replacement in Mesozoic birds: evidence from newly discovered Brazilian enantiornithines

Abstract Polyphyodonty—multiple tooth generations—in Mesozoic birds has been confirmed since the nineteenth century. Their dental cycle had been assessed through sparse data from tooth roots revealed through broken jawbones and disattached teeth. However, detailed descriptions of their tooth cycling...

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Autores principales:	Yun-Hsin Wu, Luis M. Chiappe, David J. Bottjer, William Nava, Agustín G. Martinelli
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/304f76dfc23142a5a3399322c894c03c
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spelling	oai:doaj.org-article:304f76dfc23142a5a3399322c894c03c2021-12-02T17:37:29ZDental replacement in Mesozoic birds: evidence from newly discovered Brazilian enantiornithines10.1038/s41598-021-98335-82045-2322https://doaj.org/article/304f76dfc23142a5a3399322c894c03c2021-09-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-98335-8https://doaj.org/toc/2045-2322Abstract Polyphyodonty—multiple tooth generations—in Mesozoic birds has been confirmed since the nineteenth century. Their dental cycle had been assessed through sparse data from tooth roots revealed through broken jawbones and disattached teeth. However, detailed descriptions of their tooth cycling are lacking, and the specifics of their replacement patterns remain largely unknown. Here we present unprecedented µCT data from three enantiornithine specimens from the Upper Cretaceous of southeastern Brazil. The high resolution µCT data show an alternating dental replacement pattern in the premaxillae, consistent with the widespread pattern amongst extinct and extant reptiles. The dentary also reveals dental replacement at different stages. These results strongly suggest that an alternating pattern was typical of enantiornithine birds. µCT data show that new teeth start lingually within the alveoli, resorb roots of functional teeth and migrate labially into their pulp cavities at an early stage, similar to modern crocodilians. Our results imply that the control mechanism for tooth cycling is conserved during the transition between non-avian reptiles and birds. These first 3D reconstructions of enantiornithine dental replacement demonstrate that 3D data are essential to understand the evolution and deep homology of archosaurian tooth cycling.Yun-Hsin WuLuis M. ChiappeDavid J. BottjerWilliam NavaAgustín G. MartinelliNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Yun-Hsin Wu Luis M. Chiappe David J. Bottjer William Nava Agustín G. Martinelli Dental replacement in Mesozoic birds: evidence from newly discovered Brazilian enantiornithines
description	Abstract Polyphyodonty—multiple tooth generations—in Mesozoic birds has been confirmed since the nineteenth century. Their dental cycle had been assessed through sparse data from tooth roots revealed through broken jawbones and disattached teeth. However, detailed descriptions of their tooth cycling are lacking, and the specifics of their replacement patterns remain largely unknown. Here we present unprecedented µCT data from three enantiornithine specimens from the Upper Cretaceous of southeastern Brazil. The high resolution µCT data show an alternating dental replacement pattern in the premaxillae, consistent with the widespread pattern amongst extinct and extant reptiles. The dentary also reveals dental replacement at different stages. These results strongly suggest that an alternating pattern was typical of enantiornithine birds. µCT data show that new teeth start lingually within the alveoli, resorb roots of functional teeth and migrate labially into their pulp cavities at an early stage, similar to modern crocodilians. Our results imply that the control mechanism for tooth cycling is conserved during the transition between non-avian reptiles and birds. These first 3D reconstructions of enantiornithine dental replacement demonstrate that 3D data are essential to understand the evolution and deep homology of archosaurian tooth cycling.
format	article
author	Yun-Hsin Wu Luis M. Chiappe David J. Bottjer William Nava Agustín G. Martinelli
author_facet	Yun-Hsin Wu Luis M. Chiappe David J. Bottjer William Nava Agustín G. Martinelli
author_sort	Yun-Hsin Wu
title	Dental replacement in Mesozoic birds: evidence from newly discovered Brazilian enantiornithines
title_short	Dental replacement in Mesozoic birds: evidence from newly discovered Brazilian enantiornithines
title_full	Dental replacement in Mesozoic birds: evidence from newly discovered Brazilian enantiornithines
title_fullStr	Dental replacement in Mesozoic birds: evidence from newly discovered Brazilian enantiornithines
title_full_unstemmed	Dental replacement in Mesozoic birds: evidence from newly discovered Brazilian enantiornithines
title_sort	dental replacement in mesozoic birds: evidence from newly discovered brazilian enantiornithines
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/304f76dfc23142a5a3399322c894c03c
work_keys_str_mv	AT yunhsinwu dentalreplacementinmesozoicbirdsevidencefromnewlydiscoveredbrazilianenantiornithines AT luismchiappe dentalreplacementinmesozoicbirdsevidencefromnewlydiscoveredbrazilianenantiornithines AT davidjbottjer dentalreplacementinmesozoicbirdsevidencefromnewlydiscoveredbrazilianenantiornithines AT williamnava dentalreplacementinmesozoicbirdsevidencefromnewlydiscoveredbrazilianenantiornithines AT agustingmartinelli dentalreplacementinmesozoicbirdsevidencefromnewlydiscoveredbrazilianenantiornithines
_version_	1718379874733785088

Dental replacement in Mesozoic birds: evidence from newly discovered Brazilian enantiornithines

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