A New Genus of Fossil Cycads Yixianophyllum gen. nov. from the Late Jurassic Yixian Formation, Western Liaoning, China

被引：0

作者：

ZHENG Shaolin LI Nan LI Yong ZHANG Wu and BIAN Xiongfei Shenyang Institute of Geology and Mineral Resources Ministry of Land and Resources Shenyang Liaoning Botanical Gardens of Xianhu Shenzhen Guangdong ^{[1
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机构：

来源：

Acta Geologica Sinica(English Edition) | 2005年 / 05期

关键词：

western Liaoning; Yixian Formation; Late Jurassic; Cycads; Yixianophyllum gen. nov; epidermal structures;

D O I：

暂无

中图分类号：

Q914.2 [化石];

学科分类号：

0709 ; 070903 ;

摘要：

A new genus of fossil Cycads, Yixianophyllum gen. nov., is reported here. The specimens were collected from the southern hill of Jinjiagou village, Toudaohezi Town, Yixian County, western Liaoning Province, China. The fossil plant-bearing bed belongs to the lower part, the Zhuanchengzi bed, of the Upper Jurassic Yixian Formation (Yixianian). The new genus in leaf shape, venation and epidermal structure shows a transitional form between Mesozoic Cycads (Ctenis, Nilssonia) and modern Cycads (Stangeria and Encephalartos). Since the features of these specimens differ from any known genera of Cycads, a new generic name Yixianophyllum is proposed for these leaves. Typical species, Yixianophyllum jinjiagouense gen. et sp. nov. is described here. A supposed evolutionary tendency of Cycadean leaf-forms with Taeniopteris-type is discussed.

引用

页码：582 / 592

页数：11