Transformation of the pectoral girdle in pennaraptorans: critical steps in the formation of the modern avian shoulder joint

doi:10.7717/peerj.16960

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	Transformation of the pectoral girdle in pennaraptorans: critical steps in the formation of the modern avian shoulder joint
	Wu, Qian 1,2; O'Connor, Jingmai K.4; Wang, Shiying 5; Zhou, Zhonghe2,3
	2024-02-29
发表期刊	PEERJ
ISSN	2167-8359
卷号	12 页码:42
通讯作者	Wu, Qian([email protected])
摘要	Important transformations of the pectoral girdle are related to the appearance of flight capabilities in the Dinosauria. Previous studies on this topic focused mainly on paravians yet recent data suggests flight evolved in dinosaurs several times, including at least once among non-avialan paravians. Thus, to fully explore the evolution of flightrelated avian shoulder girdle characteristics, it is necessary to compare morphology more broadly. Here, we present information from pennaraptoran specimens preserving pectoral girdle elements, including all purportedly volant taxa, and extensively compare aspects of the shoulder joint. The results show that many pectoral girdle modifications appear during the evolution from basal pennaraptorans to paravians, including changes in the orientation of the coracoid body and the location of the articulation between the furcula and scapula. These modifications suggest a change in forelimb range of motion preceded the origin of flight in paravians. During the evolution of early avialans, additional flight adaptive transformations occur, such as the separation of the scapula and coracoid and reduction of the articular surface between these two bones, reduction in the angle between these two elements, and elongation of the coracoid. The diversity of coracoid morphologies and types of articulations joining the scapulacoracoid suggest that each early avialan lineage evolved these features in parallel as they independently evolved more refined flight capabilities. In early ornithothoracines, the orientation of the glenoid fossa and location of the acrocoracoid approaches the condition in extant birds, suggesting a greater range of motion in the flight stroke, which may represent the acquisition of improved powered flight capabilities, such as ground take -off. The formation of a new articulation between the coracoid and furcula in the Ornithuromorpha is the last step in the formation of an osseous triosseal canal, which may indicate the complete acquisition of the modern flight apparatus. These morphological transitions equipped birds with a greater range of motion, increased and more efficient muscular output and while at the same time transmitting the increased pressure being generated by ever more powerful flapping movements in such a way as to protect the organs. The driving factors and functional adaptations of many of these transitional morphologies are as yet unclear although ontogenetic transitions in forelimb function observed in extant birds provide an excellent framework through which we can explore the behavior of Mesozoic pennaraptorans.
关键词	Flight evolution Coracoid Furcula Scapula Triosseal canal
DOI	10.7717/peerj.16960
关键词[WOS]	PRIMITIVE ENANTIORNITHINE BIRD ; BIZARRE JURASSIC MANIRAPTORAN ; EARLY CRETACEOUS BIRD ; DROMAEOSAURID DINOSAUR ; FEATHERED DINOSAURS ; TROODONTID THEROPOD ; PROVIDES INSIGHTS ; ORNITHURINE BIRD ; YIXIAN FORMATION ; EARLY EVOLUTION
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[42288201] ; Scientific Research Foundation of Shenyang Normal University[BS202305]
项目资助者	National Natural Science Foundation of China ; Scientific Research Foundation of Shenyang Normal University
WOS研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
WOS记录号	WOS:001175344000003
出版者	PEERJ INC
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/23480
专题	中国科学院古脊椎动物与古人类研究所
通讯作者	Wu, Qian
作者单位	1.Univ Chinese Acad Sci, Beijing, Peoples R China 2.CAS Ctr Excellence Life & Paleoenvironm, Beijing, Peoples R China 3.Chinese Acad Sci, Key Lab Vertebrate Evolut & Human Origins, Inst Vertebrate Paleontol & Paleoanthropol, Beijing, Peoples R China 4.Field Museum Nat Hist, Negaunee Integrat Res Ctr, Chicago, IL USA 5.Shenyang Normal Univ, Coll Paleontol, Shenyang, Peoples R China
推荐引用方式 GB/T 7714	Wu, Qian,O'Connor, Jingmai K.,Wang, Shiying,et al. Transformation of the pectoral girdle in pennaraptorans: critical steps in the formation of the modern avian shoulder joint[J]. PEERJ,2024,12:42.
APA	Wu, Qian,O'Connor, Jingmai K.,Wang, Shiying,&Zhou, Zhonghe.(2024).Transformation of the pectoral girdle in pennaraptorans: critical steps in the formation of the modern avian shoulder joint.PEERJ,12,42.
MLA	Wu, Qian,et al."Transformation of the pectoral girdle in pennaraptorans: critical steps in the formation of the modern avian shoulder joint".PEERJ 12(2024):42.