A new mammal from the Lower Cretaceous Jehol Biota and implications for eutherian evolution
Here we report on a new Early Cretaceous eutherian represented by a partial skeleton from the Jiufotang Formation at Sihedang site, Lingyuan City, Liaoning Province that fills a crucial gap between the earliest eutherians from the Yixian Formation and later Cretaceous eutherians. The new specimen reveals, to our knowledge for the first time in eutherians, that the Meckelian cartilage was ossified but reduced in size, confirming a complete detachment of the middle ear from the lower jaw. Seven hyoid elements, including paired stylohyals, epihyals and thyrohyals and the single basihyal are preserved. For the inner ear the ossified primary lamina, base of the secondary lamina, ossified cochlear ganglion and secondary crus commune are present and the cochlear canal is coiled through 360°. In addition, plesiomorphic features of the dentition include weak conules, lack of pre- and post-cingula and less expanded protocones on the upper molars and height differential between the trigonid and talonid, a large protoconid and a small paraconid on the lower molars. The new taxon displays an alternating pattern of tooth replacement with P3 being the last upper premolar to erupt similar to the basal eutherian Juramaia. Parsimony analysis places the new taxon with Montanalestes, Sinodelphys and Ambolestes as a sister group to other eutherians. This article is part of the theme issue 'The impact of Chinese palaeontology on evolutionary research'.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2022 |
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| Erschienen: |
2022 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:377 |
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| Enthalten in: |
Philosophical transactions of the Royal Society of London. Series B, Biological sciences - 377(2022), 1847 vom: 28. März, Seite 20210042 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Wang, Hai-Bing [VerfasserIn] |
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| Links: |
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| Themen: |
Early Cretaceous |
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| Anmerkungen: |
Date Completed 28.04.2022 Date Revised 28.04.2022 published: Print-Electronic figshare: 10.6084/m9.figshare.c.5772143 Citation Status MEDLINE |
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| doi: |
10.1098/rstb.2021.0042 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM336575378 |
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| 245 | 1 | 2 | |a A new mammal from the Lower Cretaceous Jehol Biota and implications for eutherian evolution |
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| 500 | |a figshare: 10.6084/m9.figshare.c.5772143 | ||
| 500 | |a Citation Status MEDLINE | ||
| 520 | |a Here we report on a new Early Cretaceous eutherian represented by a partial skeleton from the Jiufotang Formation at Sihedang site, Lingyuan City, Liaoning Province that fills a crucial gap between the earliest eutherians from the Yixian Formation and later Cretaceous eutherians. The new specimen reveals, to our knowledge for the first time in eutherians, that the Meckelian cartilage was ossified but reduced in size, confirming a complete detachment of the middle ear from the lower jaw. Seven hyoid elements, including paired stylohyals, epihyals and thyrohyals and the single basihyal are preserved. For the inner ear the ossified primary lamina, base of the secondary lamina, ossified cochlear ganglion and secondary crus commune are present and the cochlear canal is coiled through 360°. In addition, plesiomorphic features of the dentition include weak conules, lack of pre- and post-cingula and less expanded protocones on the upper molars and height differential between the trigonid and talonid, a large protoconid and a small paraconid on the lower molars. The new taxon displays an alternating pattern of tooth replacement with P3 being the last upper premolar to erupt similar to the basal eutherian Juramaia. Parsimony analysis places the new taxon with Montanalestes, Sinodelphys and Ambolestes as a sister group to other eutherians. This article is part of the theme issue 'The impact of Chinese palaeontology on evolutionary research' | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Research Support, Non-U.S. Gov't | |
| 650 | 4 | |a Early Cretaceous | |
| 650 | 4 | |a Eutheria | |
| 650 | 4 | |a Jehol Biota | |
| 650 | 4 | |a Meckelian cartilage | |
| 650 | 4 | |a inner ear | |
| 650 | 4 | |a tooth replacement | |
| 700 | 1 | |a Hoffmann, Simone |e verfasserin |4 aut | |
| 700 | 1 | |a Wang, Dian-Can |e verfasserin |4 aut | |
| 700 | 1 | |a Wang, Yuan-Qing |e verfasserin |4 aut | |
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