Origin of the avian predentary and evidence of a unique form of cranial kinesis in Cretaceous ornithuromorphs

doi:10.1073/pnas.1911820116

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	Origin of the avian predentary and evidence of a unique form of cranial kinesis in Cretaceous ornithuromorphs
	Bailleul, Alida M.1,2; Li, Zhiheng 1,2; O'Connor, Jingmai 1,2; Zhou, Zhonghe 1,2
刊名	PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
	2019-12-03
卷号	116 期号:49 页码:24696-24706
关键词	predentary birds sesamoid kinesis proprioception
ISSN号	0027-8424
DOI	10.1073/pnas.1911820116
通讯作者	Bailleul, Alida M.(alida.bailleul@ivpp.ac.cn) ; Zhou, Zhonghe(zhouzhonghe@ivpp.ac.cn)
英文摘要	The avian predentary is a small skeletal structure located rostra! to the paired dentaries found only in Mesozoic ornithuromorphs. The evolution and function of this enigmatic element is unknown. Skeletal tissues forming the predentary and the lower jaws in the basal ornithuromorph Yanornis martini are identified using computed-tomography, scanning electron microscopy, and histology. On the basis of these data, we propose hypotheses for the development, structure, and function of this element. The predentary is composed of trabecular bone. The convex caudal surface articulates with rostromedial concavities on the dentaries. These articular surfaces are covered by cartilage, which on the dentaries is divided into 3 discrete patches: 1 rostral articular cartilage and 2 symphyseal cartilages. The mechanobiology of avian cartilage suggests both compression and kinesis were present at the predentary-dentary joint, therefore suggesting a yet unknown form of avian cranial kinesis. Ontogenetic processes of skeletal formation occurring within extant taxa do not suggest the predentary originates within the dentaries, nor Meckel's cartilage. We hypothesize that the predentary is a biomechanically induced sesamoid that arose within the soft connective tissues located rostra! to the dentaries. The mandibular canal hosting the alveolar nerve suggests that the dentary teeth and predentary of Yanomis were proprioceptive. This whole system may have increased foraging efficiency. The Mesozoic avian predentary apparently coevolved with an edentulous portion of the premaxilla, representing a unique kinetic morphotype that combined teeth with a small functional beak and persisted successfully for similar to 60 million years.
资助项目	Chinese Academy of Sciences-President's International Fellowship Initiative program ; Craton destruction and terrestrial life evolution program of the National Natural Science Foundation of China[41688103] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB26000000]
WOS关键词	SECONDARY CARTILAGE ; ORNITHURINE BIRD ; EVOLUTION ; BONE ; MOVEMENT ; HOMOLOGY ; SKELETON ; SKULL ; MORPHOLOGY ; MOTILITY
WOS研究方向	Science & Technology - Other Topics
语种	英语
出版者	NATL ACAD SCIENCES
WOS记录号	WOS:000500804600049
资助机构	Chinese Academy of Sciences-President's International Fellowship Initiative program ; Craton destruction and terrestrial life evolution program of the National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://119.78.100.205/handle/311034/16759]
专题	古脊椎动物与古人类研究所_图书馆1
通讯作者	Bailleul, Alida M.; Zhou, Zhonghe
作者单位	1.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Key Lab Vertebrate Evolut & Human Origins, Beijing 100044, Peoples R China 2.Chinese Acad Sci, Ctr Excellence Life & Paleoenvironm, Beijing 100044, Peoples R China
推荐引用方式 GB/T 7714	Bailleul, Alida M.,Li, Zhiheng,O'Connor, Jingmai,et al. Origin of the avian predentary and evidence of a unique form of cranial kinesis in Cretaceous ornithuromorphs[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2019,116(49):24696-24706.
APA	Bailleul, Alida M.,Li, Zhiheng,O'Connor, Jingmai,&Zhou, Zhonghe.(2019).Origin of the avian predentary and evidence of a unique form of cranial kinesis in Cretaceous ornithuromorphs.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,116(49),24696-24706.
MLA	Bailleul, Alida M.,et al."Origin of the avian predentary and evidence of a unique form of cranial kinesis in Cretaceous ornithuromorphs".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 116.49(2019):24696-24706.