KMS Institute of Vertebrate Paleontology and Paleoanthropology
| Structure and possible ventilatory function of unusual, expanded sternal ribs in the Early Cretaceous bird Jeholornis | |
Zheng, Xiaoting1,2; Sullivan, Corwin3,4; O'Connor, Jingmai K.5,6; Wang, Xiaoli1,2,7; Wang, Yan1,2; Zhang, Xiaomei1,2; Zhou, Zhonghe5
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| 2020-12-01 | |
| 发表期刊 | CRETACEOUS RESEARCH
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| ISSN | 0195-6671 |
| 卷号 | 116期号:0页码:10 |
| 摘要 | Many specimens of the basal bird Jeholornis from the Early Cretaceous Jehol Biota of northeast China include one or two distinctive paddle-shaped skeletal elements preserved in the thoracic region. These ossifications have generally been identified as lateral trabeculae, paired processes of the sternum that are common within the derived avian Glade Ornithothoraces. In extant birds, lateral trabeculae define membrane-filled embayments or fenestrae in the caudal portion of the sternum that contribute to the area available for attachment of the pectoralis musculature, which drives the downstroke in flight. The presence of lateral trabeculae in Jeholornis would thus suggest a proportionally larger M. pectoralis, and a more powerful downstroke, than in other non-ornithothoracine avians. However, previously undescribed specimens of Jeholornis reveal that the paddle-shaped elements are actually anomalously expanded sternal ribs, the caudalmost of four pairs in the ribcage. Accordingly, lateral trabeculae are absent in Jeholornis, dovetailing with other evidence that basal birds lack many components of the sophisticated flight apparatus typical of ornithothoracines. The expanded sternal ribs represent a striking, and somewhat functionally enigmatic, autapomorphy of Jeholornis. In many pterosaurs the sternal ribs bear multiple small prominences, the sternocostapophyses, that probably improved the mechanical advantage of ribcage musculature involved in ventilation and increased the area for muscle attachment. The sternal rib expansions seen in Jeholornis presumably served a similar purpose, and are among a suite of derived features of this taxon that appear to represent adaptations for the demands of powered flight but only partially parallel those independently acquired by ornithothoracines. (C) 2020 Elsevier Ltd. All rights reserved. |
| 关键词 | Jeholornis Sternal rib Sternum Respiration Lateral trabecula Jehol Biota |
| DOI | 10.1016/j.cretres.2020.104597 |
| 关键词[WOS] | FORELIMB MYOLOGY ; BASAL BIRDS ; EVOLUTION ; MORPHOLOGY ; FLIGHT ; ENANTIORNITHINE ; CHINA ; ARCHAEOPTERYX ; OSSIFICATION ; DIVERSITY |
| 收录类别 | SCI |
| 语种 | 英语 |
| 资助项目 | National Natural Science Foundation of China[41688103] ; National Natural Science Foundation of China[41472023] ; National Natural Science Foundation of China[41402017] ; University of Alberta ; Natural Sciences and Engineering Research Council of Canada[RGPIN-2017-06246] |
| WOS研究方向 | Geology ; Paleontology |
| WOS类目 | Geology ; Paleontology |
| WOS记录号 | WOS:000579821800022 |
| 出版者 | ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://119.78.100.205/handle/311034/18849 |
| 专题 | 中国科学院古脊椎动物与古人类研究所 |
| 通讯作者 | Sullivan, Corwin |
| 作者单位 | 1.Linyi Univ, Inst Geol & Paleontol, Linyi 276005, Shandong, Peoples R China 2.Shandong Tianyu Museum Nat, Pingyi 273300, Shandong, Peoples R China 3.Univ Alberta, Dept Biol Sci, Edmonton, AB T6G 2E9, Canada 4.Philip J Currie Dinosaur Museum, Wembley, AB T0H 3S0, Canada 5.Chinese Acad Sci, Key Lab Vertebrate Evolut & Human Origins, Inst Vertebrate Paleontol & Paleoanthropol, Beijing 100044, Peoples R China 6.CAS Ctr Excellence Life & Paleoenvironm, Beijing 100044, Peoples R China 7.Shandong Univ Sci & Technol, Coll Earth Sci & Engn, Qingdao 266590, Shandong, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zheng, Xiaoting,Sullivan, Corwin,O'Connor, Jingmai K.,et al. Structure and possible ventilatory function of unusual, expanded sternal ribs in the Early Cretaceous bird Jeholornis[J]. CRETACEOUS RESEARCH,2020,116(0):10. |
| APA | Zheng, Xiaoting.,Sullivan, Corwin.,O'Connor, Jingmai K..,Wang, Xiaoli.,Wang, Yan.,...&Zhou, Zhonghe.(2020).Structure and possible ventilatory function of unusual, expanded sternal ribs in the Early Cretaceous bird Jeholornis.CRETACEOUS RESEARCH,116(0),10. |
| MLA | Zheng, Xiaoting,et al."Structure and possible ventilatory function of unusual, expanded sternal ribs in the Early Cretaceous bird Jeholornis".CRETACEOUS RESEARCH 116.0(2020):10. |
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