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DOI | 10.1029/2018JD028365 |
A symmoriiform chondrichthyan braincase and the origin of chimaeroid fishes | |
Coates, Michael I.1; Gess, Robert W.2,3; Finarelli, John A.4,5; Criswell, Katharine E.1; Tietjen, Kristen1 | |
2017-01-12 | |
发表期刊 | NATURE
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ISSN | 0028-0836 |
EISSN | 1476-4687 |
出版年 | 2017 |
卷号 | 541期号:7636页码:208-+ |
文章类型 | Article |
语种 | 英语 |
国家 | USA; South Africa; Ireland |
英文摘要 | Chimaeroid fishes (Holocephali) are one of the four principal divisions of modern gnathostomes (jawed vertebrates). Despite only 47 described living species(1), chimaeroids are the focus of resurgent interest as potential archives of genomic data(2) and for the unique perspective they provide on chondrichthyan and gnathostome ancestral conditions. Chimaeroids are also noteworthy for their highly derived body plan(1,3,4). However, like other living groups with distinctive anatomies(5), fossils have been of limited use in unravelling their evolutionary origin, as the earliest recognized examples already exhibit many of the specializations present in modern forms(6,7). Here we report the results of a computed tomography analysis of Dwykaselachus, an enigmatic chondrichthyan braincase from the similar to 280 million year old Karoo sediments of South Africa(8). Externally, the braincase is that of a symmoriid shark(9-13) and is by far the most complete uncrushed example yet discovered. Internally, the morphology exhibits otherwise characteristically chimaeroid specializations, including the otic labyrinth arrangement and the brain space configuration relative to exceptionally large orbits. These results have important implications for our view of modern chondrichthyan origins, add robust structure to the phylogeny of early crown group gnathostomes, reveal preconditions that suggest an initial morpho-functional basis for the derived chimaeroid cranium, and shed new light on the chondrichthyan response to the extinction at the end of the Devonian period. |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000396125500039 |
WOS关键词 | BAYESIAN PHYLOGENETIC INFERENCE ; SHARK ; RECONSTRUCTION ; GNATHOSTOME ; PLACODERM ; DIVERSITY ; EVOLUTION ; ANATOMY ; BIOLOGY ; LIMITS |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/32587 |
专题 | 气候变化 |
作者单位 | 1.Univ Chicago, Dept Organismal Biol & Anat, Chicago, IL 60637 USA; 2.Rhodes Univ, Dept Geol, ZA-6139 Grahamstown, South Africa; 3.Rhodes Univ, Albany Museum, ZA-6139 Grahamstown, South Africa; 4.Univ Coll Dublin, UCD Sci Educ & Res Ctr, UCD Sch Biol & Environm Sci, Dublin 4, Ireland; 5.Univ Coll Dublin, UCD Earth Inst, Dublin 4, Ireland |
推荐引用方式 GB/T 7714 | Coates, Michael I.,Gess, Robert W.,Finarelli, John A.,et al. A symmoriiform chondrichthyan braincase and the origin of chimaeroid fishes[J]. NATURE,2017,541(7636):208-+. |
APA | Coates, Michael I.,Gess, Robert W.,Finarelli, John A.,Criswell, Katharine E.,&Tietjen, Kristen.(2017).A symmoriiform chondrichthyan braincase and the origin of chimaeroid fishes.NATURE,541(7636),208-+. |
MLA | Coates, Michael I.,et al."A symmoriiform chondrichthyan braincase and the origin of chimaeroid fishes".NATURE 541.7636(2017):208-+. |
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