Kooperativer Bibliotheksverbund

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Format: XV, 630 S. , Ill., Kt.

ISBN: 0231119186

Language: English

URL: Inhaltsverzeichnis

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Format: 65 S. , Ill., graph. Darst.

Series Statement: American Museum Novitates 3480

Language: English

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Format: 1 Online-Ressource (9 Seiten)

Content: The sternum is a stabilizing element in the axial skeleton of most tetrapods, closely linked with the function of the pectoral girdle of the appendicular skeleton. Modern mammals have a distinctive sternum characterized by multiple ossified segments, the origins of which are poorly understood. Although the evolution of the pectoral girdle has been extensively studied in early members of the mammalian total group (Synapsida), only limited data exist for the sternum. Ancestrally, synapsids exhibit a single sternal element and previously the earliest report of a segmental sternum in non-mammalian synapsids was in the Middle Triassic cynodont Diademodon tetragonus. Here, we describe the well-preserved sternum of a gorgonopsian, a group of sabre-toothed synapsids from the Permian. It represents an ossified, multipartite element resembling the mammalian condition. This discovery pulls back the origin of the distinctive “mammalian” sternum to the base of Theriodontia, significantly extending the temporal range of this morphology. Through a review of sternal morphology across Synapsida, we reconstruct the evolutionary history of this structure. Furthermore, we explore its role in the evolution of mammalian posture, gait, and ventilation through progressive regionalization of the postcranium as well as the posteriorization of musculature associated with mammalian breathing.

Content: Peer Reviewed

Note: The article processing charge was funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) – 491192747 and the Open Access Publication Fund of Humboldt-Universität zu Berlin.

In: [London] : Macmillan Publishers Limited, part of Springer Nature, 2022, 12

Language: English

DOI: 10.18452/28252

DOI: 10.1038/s41598-022-17492-6

URN: urn:nbn:de:kobv:11-110-18452/28903-6

URL: Volltext  (kostenfrei)

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Format: xv, 630 p. : , ill., maps.

Edition: Electronic reproduction. Ann Arbor, MI : ProQuest, 2015. Available via World Wide Web. Access may be limited to ProQuest affiliated libraries.

Language: English

Keywords: Electronic books.

URL: Click to View

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Format: 65 S. : , Ill., graph. Darst.

Series Statement: American Museum novitates 3480

In: no:835

Language: English

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Format: 1 online resource : , 239 illus.

ISBN: 9780231509275

Content: Early mammals were significant and fast-evolving elements of the terrestrial biota for much of the Mesozoic, and they have played an increasingly important role in studies of paleoecology, faunal turnover, and historical biogeography. This book thoroughly covers all aspects of the anatomy, paleobiology, and systematics of early mammalian groups, in addition to the extant lineages with long history extending back into Mesozoic. Numerous detailed maps and line drawings enhance the text.

Note: Frontmatter -- , CONTENTS -- , FOREWORD -- , PREFACE -- , 1. Introduction -- , 2. Distribution: Mesozoic Mammals in Space and Time -- , 3. Origin of Mammals -- , 4. The Earliest-Known Stem Mammals -- , 5. Docodontans -- , 6. Australosphenidans and Shuotherium -- , 7. Eutriconodontans -- , 8. Allotherians -- , 9. “Symmetrodontans” -- , 10. “Eupantotherians” (Stem Cladotherians) -- , 11. “Tribotherians” (Stem Boreosphenidans) -- , 12. Metatherians -- , 13. Eutherians -- , 14. Gondwanatherians -- , 15. Interrelationships of Mesozoic Mammals -- , APPENDIX -- , REFERENCES -- , ADDITIONAL REFERENCES -- , ILLUSTRATION CREDITS -- , INDEX , In English.

Language: English

DOI: 10.7312/kiel11918

URL: https://doi.org/10.7312/kiel11918