A new structurally preserved fern rhizome of Osmundaceae (Filicales) Ashicaulis wangii sp nov from the Jurassic of western Liaoning and its significances for palaeobiogeography and evolution

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	A new structurally preserved fern rhizome of Osmundaceae (Filicales) Ashicaulis wangii sp nov from the Jurassic of western Liaoning and its significances for palaeobiogeography and evolution
其他题名	A new structurally preserved fern rhizome of Osmundaceae (Filicales)Ashicaulis wangiisp. nov. from the Jurassic of western Liaoning and its significances for palaeobiogeography and evolution
	Tian Ning 1; Wang YongDong 2; Zhang Wu 3; Jiang ZiKun 4
	2014
发表期刊	SCIENCE CHINA-EARTH SCIENCES
ISSN	1674-7313
卷号	57 期号:4 页码:671-681
摘要	Permineralized osmundaceous rhizome with anatomical and phylogenetic information plays a significant role in understanding the origin, evolution, and diversity variation of the fern family Osmundaceae in geological history. The northern Hebei and western Liaoning region is one of the most important fossil localities for the Jurassic osmundaceous rhizome fossils in the Northern Hemisphere; however, the diversity character of osmundaceous rhizome fossil remains poorly known. A new structurally preserved fern rhizome species, Ashicaulis wangii sp. nov., is described from the Middle Jurassic Tiaojishan Formation in Beipiao City, Liaoning Province, northeastern China. The rhizome is composed of heterogeneous pith, an ectophloic-dictyoxylic siphonostele, a two-layered cortex, and a mantle of adventitious roots and petiole bases. The xylem cylinder, with complete leaf gaps, consists of 15-17 xylem strands. The petiole base is characterized by a heterogeneous sclerotic ring and numerous sclerenchyma masses in the petiolar cortex. Among five known Ashicaulis species with heterogeneous sclerotic ring, four of them are documented from China. Therefore, osmundaceous rhizome fossils from China show endemic anatomical characteristics and significances for palaeobiogeography. Comparisons of anatomical features suggest that A. wangii sp. nov. bears close similarities to Osmunda pluma Miller from the Paleocene of Dakota, USA. Fossil species of A. wangii provides new evidence for further understanding the species diversity of osmundaceous rhizome fossil in China and in the Northern Hemisphere, and contributes to exploring the macroevolution process of the Mesozoic osmundaceous plants.
其他摘要	Permineralized osmundaceous rhizome with anatomical and phylogenetic information plays a significant role in understanding the origin, evolution, and diversity variation of the fern family Osmundaceae in geological history. The northern Hebei and western Liaoning region is one of the most important fossil localities for the Jurassic osmundaceous rhizome fossils in the Northern Hemisphere; however, the diversity character of osmundaceous rhizome fossil remains poorly known. A new structurally preserved fern rhizome species, Ashicaulis wangii sp. nov., is described from the Middle Jurassic Tiaojishan Formation in Beipiao City, Liaoning Province, northeastern China. The rhizome is composed of heterogeneous pith, an ectophloic– dictyoxylic siphonostele, a two–layered cortex, and a mantle of adventitious roots and petiole bases. The xylem cylinder, with complete leaf gaps, consists of 15–17 xylem strands. The petiole base is characterized by a heterogeneous sclerotic ring and numerous sclerenchyma masses in the petiolar cortex. Among five known Ashicaulis species with heterogeneous sclerotic ring, four of them are documented from China. Therefore, osmundaceous rhizome fossils from China show endemic anatomical characteristics and significances for palaeobiogeography. Comparisons of anatomical features suggest that A. wangii sp. nov. bears close similarities to Osmunda pluma Miller from the Paleocene of Dakota, USA. Fossil species of A. wangii provides new evidence for further understanding the species diversity of osmundaceous rhizome fossil in China and in the Northern Hemisphere, and contributes to exploring the macroevolution process of the Mesozoic osmundaceous plants.
关键词	MILLEROCAULIS OSMUNDACEAE CHINA CONSTRAINTS PROVINCE GEN AGE Osmundaceae petrified rhizome Ashicaulis anatomical structure Middle Jurassic western Liaoning
收录类别	CSCD
语种	英语
资助项目	[Ministry of Science and Technology, China] ; [National Natural Science Foundation of China] ; [CAS] ; [Team Program of Scientific Innovation and Interdisciplinary Cooperation of CAS] ; [State Key Laboratory of Palaeobiology and Stratigraphy (Nanjing Institute of Geology and Palaeontology, CAS)] ; [Liaoning Provincial Education Department] ; [Shenyang Normal University]
CSCD记录号	CSCD:5123465
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/157284
专题	中国科学院金属研究所
作者单位	1.沈阳师范大学 2.中国科学院 3.中国科学院金属研究所 4.Chinese Acad Geol Science, Beijing 100037, Peoples R China
推荐引用方式 GB/T 7714	Tian Ning,Wang YongDong,Zhang Wu,et al. A new structurally preserved fern rhizome of Osmundaceae (Filicales) Ashicaulis wangii sp nov from the Jurassic of western Liaoning and its significances for palaeobiogeography and evolution[J]. SCIENCE CHINA-EARTH SCIENCES,2014,57(4):671-681.
APA	Tian Ning,Wang YongDong,Zhang Wu,&Jiang ZiKun.(2014).A new structurally preserved fern rhizome of Osmundaceae (Filicales) Ashicaulis wangii sp nov from the Jurassic of western Liaoning and its significances for palaeobiogeography and evolution.SCIENCE CHINA-EARTH SCIENCES,57(4),671-681.
MLA	Tian Ning,et al."A new structurally preserved fern rhizome of Osmundaceae (Filicales) Ashicaulis wangii sp nov from the Jurassic of western Liaoning and its significances for palaeobiogeography and evolution".SCIENCE CHINA-EARTH SCIENCES 57.4(2014):671-681.