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The Anatomically Preserved Tripinnate Frond Rothwellopteris pecopteroides gen. et sp. nov. from the Latest Permian of South China: Timing the Stem to Crown Group Transition in Marattiales
He, Xiao-Yuan1; Wang, Shi-Jun2; Wang, Jun (王军)3; Hilton, Jason4
2019-10-01
发表期刊INTERNATIONAL JOURNAL OF PLANT SCIENCES
ISSN1058-5893
卷号180期号:8页码:869-881
摘要

Premise of research. Fern fronds are common in Late Paleozoic and Mesozoic strata. Large tri- or multipinnate fronds are mainly preserved as impression/compressions, while anatomically preserved specimens are typically smaller and comprise dispersed petioles, rachides, ultimate pinna, and pinnules. Here, we describe a large, anatomically preserved tripinnate frond from the latest Permian of southwest China that provides the first detailed histological information for a Cathaysian marattialean with pinnule morphology of the cosmopolitan Carboniferous-Permian pecopteriod type, but with different frond anatomy. Methodology. Specimens were prepared by the cellulose acetate peel technique and studied by light microscopy. Pivotal results. The tripinnate frond has a main rachis and a primary pinnae rachis with many (>70) small vascular bundles arranged in cycles and abundant tanniferous cells. Pinnules are small, and their bases are entirely attached to the ultimate rachis. Abundant vascular bundles in the rachises are distinct from previously recognized marattialean genera, justifying the establishment of Rothwellopteris pecopteroides gen. et sp. nov. Comparison of pinnule morphology with impression/compression fossils shows the specimen to be an anatomically preserved equivalent of Pecopteris marginata Li et al. Conclusions. Rothwellopteris pecopteroides displays a novel combination of marattialean characters from the extinct Paleozoic family Psaroniaceae and the extant family Marattiaceae. Its frond morphology resembles Psaroniaceae including Psaronius but differs from extant Marattiaceae that are monopinnate, palmate, or, as in Angiopteris, bipinnate and that have large pinnules with contracted bases. By contrast, its anatomy, with abundant vascular bundles, is similar to Marattiaceae, especially Angiopteris, but it is distinct from members of the Psaroniaceae in which the rachis possesses one or two tangentially elongate vascular bundles. Pecopteris marginata shows that, by the latest Permian, Marattiales had already evolved frond anatomy typical of extant genera, demonstrating that the stem group to crown group transition commenced prior to the Triassic.

关键词eusporangiate fern Marattiales Psaroniaceae Marattiaceae evolution volcaniclastic tuff Xuanwei Formation stem group crown group
DOI10.1086/704946
语种英语
关键词[WOS]GUIZHOU PROVINCE ; SOUTHWESTERN CHINA ; XUANWEI FORMATION ; GIGANTOPTERIDALES ; PSARONIUS ; PLANTS ; TRUNK
资助项目National Natural Science Foundation of China[41472021] ; National Natural Science Foundation of China[41162001] ; National Natural Science Foundation of China[41530101] ; National Natural Science Foundation of China[U1702242] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB26000000]
WOS研究方向Plant Sciences
WOS类目Plant Sciences
WOS记录号WOS:000487116000005
项目资助者National Natural Science Foundation of China ; Strategic Priority Research Program of Chinese Academy of Sciences
出版者UNIV CHICAGO PRESS
文献类型期刊论文
条目标识符http://ir.nigpas.ac.cn/handle/332004/27866
专题中国科学院南京地质古生物研究所
通讯作者He, Xiao-Yuan
作者单位1.Yunnan Univ, Inst Deep Time Terr Ecol, Kunming, Yunnan, Peoples R China
2.Chinese Acad Sci, Inst Bot, Beijing, Peoples R China
3.Chinese Acad Sci, State Key Lab Palaeobiol & Stratig, Nanjing Inst Geol & Palaeontol, Nanjing, Jiangsu, Peoples R China
4.Univ Birmingham, Sch Geog Earth & Environm Sci, Birmingham, W Midlands, England
推荐引用方式
GB/T 7714
He, Xiao-Yuan,Wang, Shi-Jun,Wang, Jun ,et al. The Anatomically Preserved Tripinnate Frond Rothwellopteris pecopteroides gen. et sp. nov. from the Latest Permian of South China: Timing the Stem to Crown Group Transition in Marattiales[J]. INTERNATIONAL JOURNAL OF PLANT SCIENCES,2019,180(8):869-881.
APA He, Xiao-Yuan,Wang, Shi-Jun,Wang, Jun ,&Hilton, Jason.(2019).The Anatomically Preserved Tripinnate Frond Rothwellopteris pecopteroides gen. et sp. nov. from the Latest Permian of South China: Timing the Stem to Crown Group Transition in Marattiales.INTERNATIONAL JOURNAL OF PLANT SCIENCES,180(8),869-881.
MLA He, Xiao-Yuan,et al."The Anatomically Preserved Tripinnate Frond Rothwellopteris pecopteroides gen. et sp. nov. from the Latest Permian of South China: Timing the Stem to Crown Group Transition in Marattiales".INTERNATIONAL JOURNAL OF PLANT SCIENCES 180.8(2019):869-881.
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