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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
Alternative TitleA 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 Ning1; Wang YongDong2; Zhang Wu3; Jiang ZiKun4
2014
Source PublicationSCIENCE CHINA-EARTH SCIENCES
ISSN1674-7313
Volume57Issue:4Pages:671-681
AbstractPermineralized 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.
Other AbstractPermineralized 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.
KeywordMILLEROCAULIS OSMUNDACEAE CHINA CONSTRAINTS PROVINCE GEN AGE Osmundaceae petrified rhizome Ashicaulis anatomical structure Middle Jurassic western Liaoning
Indexed ByCSCD
Language英语
Funding Project[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 IDCSCD:5123465
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/157284
Collection中国科学院金属研究所
Affiliation1.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
Recommended Citation
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.
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