Regional disparity in the axial skeleton of Saurichthyidae and implications for axial regionalization in non-teleostean actinopterygians

doi:10.1111/jzo.12878

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	Regional disparity in the axial skeleton of Saurichthyidae and implications for axial regionalization in non-teleostean actinopterygians
	Maxwell, E. E.4; Romano, C.3; Wu, F. -X.1,2
刊名	JOURNAL OF ZOOLOGY
	2021-03-08
页码	13
关键词	Saurichthyidae Birgeria Actinopterygii vertebral column morphology evolution axial skeleton Triassic
ISSN号	0952-8369
DOI	10.1111/jzo.12878
通讯作者	Maxwell, E. E.(erin.maxwell@smns-bw.de)
英文摘要	The postcranial axial skeleton of actinopterygian fishes is typically divided into three regions: (1) an anterior abdominal region, (2) a posterior caudal region and (3) those vertebrae supporting the caudal fin. However, in some actinopterygians, the axial skeleton is more finely subdivided, with up to six morphologically distinct sub-regions recognized. Phylogenetic continuity and homology of structures across these sub-regions have not been investigated in detail, either between or among groups. We examine variation in axial regionalization in saurichthyid fishes, a clade of extinct non-teleostean actinopterygians with highly variable axial skeletal morphology but an otherwise conservative body plan, and compare these findings to other non-teleostean actinopterygians to assess conservation of a regionalized axial skeleton within bony fishes. We document up to eight distinct regions in the vertebral column of Triassic Saurichthys: (1) a postoccipital region, (2) an anterior and (3) a posterior abdominal region, (4) a transitional region spanning the abdominal-caudal boundary, (5) an anterior and (6) a posterior caudal region and (7) preural and (8) ural regions. Based on taphonomical and morphological evidence, the transitional region appears to function in axial stiffening in the area of the median fins, whereas the abdominal region is highly flexible. The degree to which these axial regions are osteologically differentiated is highly variable across Saurichthyidae, implying iterative evolution of differentiation and de-differentiation over relatively short geological timescales. Such variably expressed regionalization was also identified in the outgroup non-teleostean actinopterygians Birgeria and Australosomus. Despite variation in morphological disparity, the regions identified in saurichthyids correlate well with those documented in some teleosts and Paleozoic actinopterygians, suggesting potential deep patterning homology but independent evolution of specific regionalized axial morphologies in response to changing functional demands.
资助项目	National Natural Science Foundation of China[41472019]
WOS研究方向	Zoology
语种	英语
出版者	WILEY
WOS记录号	WOS:000625988200001
资助机构	National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://119.78.100.205/handle/311034/18601]
专题	古脊椎动物与古人类研究所_图书馆1
通讯作者	Maxwell, E. E.
作者单位	1.Chinese Acad Sci, Ctr Excellence Life & Paleoenvironm, Beijing, Peoples R China 2.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Key Lab Vertebrate Evolut & Human Origins, Beijing, Peoples R China 3.Univ Zurich, Palaontol Inst & Museum, Zurich, Switzerland 4.Staatliches Museum Nat Kunde Stuttgart, Rosenstein 1, D-70191 Stuttgart, Germany
推荐引用方式 GB/T 7714	Maxwell, E. E.,Romano, C.,Wu, F. -X.. Regional disparity in the axial skeleton of Saurichthyidae and implications for axial regionalization in non-teleostean actinopterygians[J]. JOURNAL OF ZOOLOGY,2021:13.
APA	Maxwell, E. E.,Romano, C.,&Wu, F. -X..(2021).Regional disparity in the axial skeleton of Saurichthyidae and implications for axial regionalization in non-teleostean actinopterygians.JOURNAL OF ZOOLOGY,13.
MLA	Maxwell, E. E.,et al."Regional disparity in the axial skeleton of Saurichthyidae and implications for axial regionalization in non-teleostean actinopterygians".JOURNAL OF ZOOLOGY (2021):13.