A reappraisal of the morphology and systematics of Extuaspis megista, a brachythoracid arthrodire from the Early Devonian of Yunnan, China
文献类型：期刊论文
| 作者 | Xue, Qinyuan1,2; Wang, Junqing2; Zhu, Min1,2; Zhu, You-an1,2 |
| 刊名 | JOURNAL OF SYSTEMATIC PALAEONTOLOGY
 |
| 出版日期 | 2025-12-31 |
| 卷号 | 23期号:1页码:16 |
| 关键词 | Placodermi Arthrodira Brachythoraci Buchanosteoidea phylogeny |
| ISSN号 | 1477-2019 |
| DOI | 10.1080/14772019.2025.2455751 |
| 英文摘要 | Exutaspis megista Y.-H. Liu and Wang 1981, discovered in the Lower Devonian Jiucheng Formation of Yunnan Province, south-western China, has been under phylogenetic contention since it was first described. Initially placed within Phlyctaeniidae, it was later suggested to be a member of Brachythoraci. Here, we re-examine the morphology of Exutaspis in detail, including the visceral surface of the skull roof and the dorsal aspect of the neurocranium, using the holotype and an additional specimen. Our redescription shows that Exutaspis possesses characters commonly seen in brachythoracids, such as an unbifid posterior postorbital process, the presence of a lateral consolidated arch and a developed nuchal thickening. Further, its morphology aligns closely with that of buchanosteoids, a cosmopolitan group of brachythoracids, particularly in the outline of the preorbital plates and in the dorsal profile of the neurocranium. To further elucidate the phylogenetic position of Exutaspis, we composed an updated matrix that contains 174 characters and 86 taxa, incorporating brachythoracids and comprehensively sampling arthrodires. The maximum parsimony analysis and Bayesian inference both recovered Exutaspis within the monophyletic Buchanosteoidea as the sister group of Goodradigbeeon australianum. The increasing knowledge of the diversity in the basal array of brachythoracids and their characters, such as the visceral consolidated structures on their skull roofs, provides important insight into the rise of brachythoracids from small bottom-feeders to fast-swimming giants. |
| WOS关键词 | PLACODERM FISHES ; SOUTH CHINA ; EUBRACHYTHORACID ARTHRODIRES ; ASPINOTHORACID ARTHRODIRE ; WEE JASPER ; GOGO ; OHIO ; AUSTRALIA ; REDESCRIPTION ; ACTINOLEPIDA |
| 资助项目 | National Natural Science Foundation of China ; [42272028] |
| WOS研究方向 | Evolutionary Biology ; Paleontology |
| 语种 | 英语 |
| WOS记录号 | WOS:001426709700001 |
| 出版者 | TAYLOR & FRANCIS LTD |
| 源URL | [http://119.78.100.205/handle/311034/24372]  |
| 专题 | 中国科学院古脊椎动物与古人类研究所 |
| 通讯作者 | Zhu, Min; Zhu, You-an |
| 作者单位 | 1.Univ Chinese Acad Sci, Beijing 100044, Peoples R China 2.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, CAS Key Lab Vertebrate Evolut & Human Origins, Beijing 100044, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xue, Qinyuan,Wang, Junqing,Zhu, Min,et al. A reappraisal of the morphology and systematics of Extuaspis megista, a brachythoracid arthrodire from the Early Devonian of Yunnan, China[J]. JOURNAL OF SYSTEMATIC PALAEONTOLOGY,2025,23(1):16. |
| APA | Xue, Qinyuan,Wang, Junqing,Zhu, Min,&Zhu, You-an.(2025).A reappraisal of the morphology and systematics of Extuaspis megista, a brachythoracid arthrodire from the Early Devonian of Yunnan, China.JOURNAL OF SYSTEMATIC PALAEONTOLOGY,23(1),16. |
| MLA | Xue, Qinyuan,et al."A reappraisal of the morphology and systematics of Extuaspis megista, a brachythoracid arthrodire from the Early Devonian of Yunnan, China".JOURNAL OF SYSTEMATIC PALAEONTOLOGY 23.1(2025):16. |
入库方式： OAI收割
来源：古脊椎动物与古人类研究所
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