A bizarre Palissya ovulate organ from Upper Triassic strata of the;Zixing coal field, Hunan Province, China

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	A bizarre Palissya ovulate organ from Upper Triassic strata of the;Zixing coal field, Hunan Province, China
	Wang ZiQiang
刊名	CHINESE SCIENCE BULLETIN
	2012
卷号	57 期号:10 页码:1169-1177
关键词	Palissya conifer female dwarf shoot Rhaetican Hunan of China
ISSN号	919BC
英文摘要	Palissya, a little-known reproductive organ with a long history, is recorded from China and Asia for the first time. A new species, Palissya hunanensis (sp. nov.), is described from the Upper Triassic Rhaetican strata of the Zixing coal field of Hunan Province. The ovulate cone has a compound shoot system that consists of a main axis and many helically-arranged axillary structures referred to as female dwarf shoots, each of which is subtended by a bract. Despite a superficial similarity, P. hunanensis differs from the typical species P. sphenolepis (Braun) Nathorst in a number of subtle but consistent features: the cone is much smaller and narrower, the bracts are much thinner, there are fewer pairs of cup-like seed scales, and the seed scales are adaxially attached to a thick axis rather than to bracts. These traits are all distinctly different from other species of the genus. Moreover, SEM observation of the new species reveals morphological features of the seed scales and seeds and details of the female dwarf shoot; significantly increases our knowledge of Palissya; and provides new evidence that it is a conifer. Palissya is related to the Lower Permian Lebowskia, a voltzian conifer bearing ovuliferous structures similar to the bract plus dwarf-shoot organization of Palissya. Palissya-type conifers probably grew in specialized marine-continent habitats, unlike most other extant and extinct conifers that grow in drier upland environments.
学科主题	古生物学
WOS关键词	SEED PLANT PHYLOGENY ; CONIFERS ; REEVALUATION ; EVOLUTION ; CONES ; NOV. ; GEN.
WOS研究方向	Multidisciplinary Sciences
语种	英语
WOS记录号	WOS:000302294600010
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39474]
专题	中国地质调查局天津地质调查中心
作者单位	Chinese Acad Geol Sci, Tianjin Inst Geol & Mineral Resources, Tianjin 300170, Peoples R China.
推荐引用方式 GB/T 7714	Wang ZiQiang. A bizarre Palissya ovulate organ from Upper Triassic strata of the;Zixing coal field, Hunan Province, China[J]. CHINESE SCIENCE BULLETIN,2012,57(10):1169-1177.
APA	Wang ZiQiang.(2012).A bizarre Palissya ovulate organ from Upper Triassic strata of the;Zixing coal field, Hunan Province, China.CHINESE SCIENCE BULLETIN,57(10),1169-1177.
MLA	Wang ZiQiang."A bizarre Palissya ovulate organ from Upper Triassic strata of the;Zixing coal field, Hunan Province, China".CHINESE SCIENCE BULLETIN 57.10(2012):1169-1177.