High resolution XCT scanning reveals complex morphology of gnathal elements in an Early Devonian arthrodire

doi:10.1016/j.palwor.2018.12.003

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	High resolution XCT scanning reveals complex morphology of gnathal elements in an Early Devonian arthrodire
	Hu, Yu-Zhi 1,2; Young, G. C.2; Burrow, Carole 3; Zhu, You-an 4,5; Lu, Jing 2,5,6
刊名	PALAEOWORLD
	2019-12-01
卷号	28 期号:4 页码:525-534
关键词	Placodermi Arthrodire Early Devonian Gnathal elements Evolution Morphology
ISSN号	1871-174X
DOI	10.1016/j.palwor.2018.12.003
通讯作者	Zhu, You-an(youan.zhu@ebc.uu.se)
英文摘要	Arthodire placoderms, as a possible sister group of Chinese 'maxillate' placoderms plus crown gnathostomes, provide important information regarding early evolution of jaws and teeth. High-resolution computed tomography and digital dissection on a unique articulated 400 million-year-old buchanosteid arthrodire permitsa detailed description of the three types of gnathal elements in basal arthrodires for the first time, giving insights into their morphology and the organization of the associated dentition. In displaying numerous denticle rows (dental fields), the gnathal element morphology is very different from the much-reduced denticulation of higher brachythoracid arthrodires, even though the latter have been used recently to interpret origin and early evolution of teeth. Ossification centres are anterolateral on the anterior supragnathal (attached to the braincase), anteromesial on the posterior supragnathal (attached to the palatoquadrate), and in the central part of the biting portion of the infragnathal (attached to the meckelian cartilage). The latter bone shows no evidence of two ossification centres as has been interpreted for more advanced arthrodires. Denticle rows radiating from the ossification centre form dental fields in all three elements, and are more similar to the gnathal elements of phlyctaeniid and actinolepid arthrodires than to advanced brachythoracids. The new evidence gives insights into the primitive arthrodire condition for comparison with the dermal jaw bones of Chinese 'maxillate' placoderms that have been homologised with the premaxilla, maxilla, and dentary of osteichthyans. The new details will help clarify the sequence of character acquisition in the evolution of marginal jaw bones in basal gnathostome groups. (C) 2018 Elsevier Ireland Ltd Elsevier B.V. and Nanjing Institute of Geology and Palaeontology, CAS. Published by Elsevier B.V. All rights reserved.
资助项目	Strategic Priority Research Program of Chinese Academy of Sciences[XDB26000000] ; Australian Research Council[DP1092870] ; Australian Research Council[DP140104161] ; National Natural Science Foundation of China[41872023] ; National Natural Science Foundation of China[41530102] ; Director's strategic postdoctoral fellowship in the ANU Research School of Physics Engineering ; Swedish Research Council[20144102] ; Wallenberg Scholarship from the Knut and Alice Wallenberg Foundation ; Queensland Museum
WOS关键词	EVOLUTIONARY ORIGINS ; PHARYNGEAL DENTICLES ; PLACODERM FISH ; TEETH ; VERTEBRATES ; PISCES ; JAWS ; GOGO
WOS研究方向	Paleontology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000499969100010
资助机构	Strategic Priority Research Program of Chinese Academy of Sciences ; Australian Research Council ; National Natural Science Foundation of China ; Director's strategic postdoctoral fellowship in the ANU Research School of Physics Engineering ; Swedish Research Council ; Wallenberg Scholarship from the Knut and Alice Wallenberg Foundation ; Queensland Museum
内容类型	期刊论文
源URL	[http://119.78.100.205/handle/311034/16740]
专题	古脊椎动物与古人类研究所_图书馆1
通讯作者	Zhu, You-an
作者单位	1.Australian Natl Univ, Res Sch Earth Sci, Bldg 142 Mills Rd, Canberra, ACT 2601, Australia 2.Australian Natl Univ, Res Sch Phys & Engn, Bldg 60, Canberra, ACT 2601, Australia 3.Queensland Museum, Geosci, 122 Gerler Rd, Hendra, Qld 4011, Australia 4.Uppsala Univ, Subdept Evolut & Dev, Norbyvagen 18A, S-75236 Uppsala, Sweden 5.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Key Lab Vertebrate Evolut & Human Origins, Beijing 100044, Peoples R China 6.CAS Ctr Excellence Life & Paleoenvironm, Beijing 100044, Peoples R China
推荐引用方式 GB/T 7714	Hu, Yu-Zhi,Young, G. C.,Burrow, Carole,et al. High resolution XCT scanning reveals complex morphology of gnathal elements in an Early Devonian arthrodire[J]. PALAEOWORLD,2019,28(4):525-534.
APA	Hu, Yu-Zhi,Young, G. C.,Burrow, Carole,Zhu, You-an,&Lu, Jing.(2019).High resolution XCT scanning reveals complex morphology of gnathal elements in an Early Devonian arthrodire.PALAEOWORLD,28(4),525-534.
MLA	Hu, Yu-Zhi,et al."High resolution XCT scanning reveals complex morphology of gnathal elements in an Early Devonian arthrodire".PALAEOWORLD 28.4(2019):525-534.