New toothed Early Cretaceous ornithuromorph bird reveals intraclade diversity in pattern of tooth loss

doi:10.1080/14772019.2019.1682696

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	New toothed Early Cretaceous ornithuromorph bird reveals intraclade diversity in pattern of tooth loss
	Wang, Min 1,2; O'Connor, Jingmai K.1,2; Zhou, Shuang 1,2; Zhou, Zhonghe 1,2
刊名	JOURNAL OF SYSTEMATIC PALAEONTOLOGY
	2019-11-09
页码	15
关键词	Cretaceous bird dentition tooth loss homoplasy Jehol Biota Ornithuromorpha phylogeny Schizooura
ISSN号	1477-2019
DOI	10.1080/14772019.2019.1682696
通讯作者	Wang, Min(wangmin@ivpp.ac.cn)
英文摘要	The earliest record of the Ornithuromorpha, which includes crown birds, is currently known from the Early Cretaceous Jehol Biota in north-eastern China. Here we describe a new ornithuromorph bird, Mengciusornis dentatus gen. et sp. nov., from the Jiufotang Formation of this biota. Mengciusornis preserves a suite of morphological features exclusively observed among ornithuromorphs in the sympatric taxon Schizooura, including a robust and 'V'-shaped furcula with a short hypocleidium, and a humerus with a large, rectangular deltopectoral crest in which the distodorsal corner is distinctively developed into a sharp, angular point. The results of our phylogenetic analysis recover these two species together in a clade, positioned stemward within the Ornithuromorpha. Mengciusornis has toothed premaxillae, in stark contrast with the edentulous jaws of Schizooura, demonstrating that dentition varied considerably between some closely related species. Furthermore, all previously known Jehol ornithuromorphs with toothed premaxillae have an edentulous rostral portion of the element, suggesting that tooth loss in this clade proceeded from the rostral end caudally, whereas in Mengciusornis the premaxilla lacks this edentulous rostral tip although the maxilla and dentary are toothless, indicating that the pattern of tooth loss, not unexpectedly, varied between lineages of ornithuromorphs. This observation suggests a strong degree of plasticity in the developmental mechanisms regulating tooth and beak formation, which is supported by earlier evidence that indicates teeth have been lost multiple times within Aves and Dinosauria. Mengciusornis preserves a ventrally hooked scapular acromion that is convergently evolved in parallel with some enantiornithines and neornithines, providing further evidence of the homoplasy that characterizes avian evolution. http://zoobank.org/urn:lsid:zoobank.org:pub:311B34B9-1CBF-47A6-B821-650C04560137
资助项目	Key Research Program of Frontier Sciences, CAS[ZDBS-LY-DQC002] ; National Natural Science Foundation of China[41722202] ; National Natural Science Foundation of China[41688103]
WOS关键词	ENANTIORNITHINE AVES ORNITHOTHORACES ; EVOLUTION ; CHINA ; SKULL ; MORPHOLOGY ; REDUCTION ; INSIGHT
WOS研究方向	Evolutionary Biology ; Paleontology
语种	英语
出版者	TAYLOR & FRANCIS LTD
WOS记录号	WOS:000495727100001
资助机构	Key Research Program of Frontier Sciences, CAS ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://119.78.100.205/handle/311034/16954]
专题	古脊椎动物与古人类研究所_图书馆1
通讯作者	Wang, Min
作者单位	1.CAS Ctr Excellence Life & Paleoenvironm, Beijing 100044, Peoples R China 2.Chinese Acad Sci, Key Lab Vertebrate Evolut & Human Origins, Inst Vertebrate Paleontol & Paleoanthropol, Beijing 100044, Peoples R China
推荐引用方式 GB/T 7714	Wang, Min,O'Connor, Jingmai K.,Zhou, Shuang,et al. New toothed Early Cretaceous ornithuromorph bird reveals intraclade diversity in pattern of tooth loss[J]. JOURNAL OF SYSTEMATIC PALAEONTOLOGY,2019:15.
APA	Wang, Min,O'Connor, Jingmai K.,Zhou, Shuang,&Zhou, Zhonghe.(2019).New toothed Early Cretaceous ornithuromorph bird reveals intraclade diversity in pattern of tooth loss.JOURNAL OF SYSTEMATIC PALAEONTOLOGY,15.
MLA	Wang, Min,et al."New toothed Early Cretaceous ornithuromorph bird reveals intraclade diversity in pattern of tooth loss".JOURNAL OF SYSTEMATIC PALAEONTOLOGY (2019):15.