A New Species of the Extinct Genus Schizolepis from the Jurassic Daohugou Flora, Inner Mongolia, China with Special Reference to the Fossil Diversity and Evolutionary Implications
A New Species of the Extinct Genus Schizolepis from the Jurassic Daohugou Flora, Inner Mongolia, China with Special Reference to the Fossil Diversity and Evolutionary Implications
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DOI：
10.1111/j.1755-6724.2011.00415.x
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发表时间：
2011-04
期刊：
影响因子：
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通讯作者：
Jianwei Zhang;A. D’Rozario;Jian-xin Yao;Zhenjie Wu;Li-jun Wang
中科院分区：
文献类型：
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作者：
Jianwei Zhang;A. D’Rozario;Jian-xin Yao;Zhenjie Wu;Li-jun Wang
道虎沟裂鳞鱼十一月是从中国内蒙古自治区宁城县道虎沟植物群的侏罗纪沉积物中描述的。雌锥体细长，呈圆柱形，种鳞复合体松散地呈螺旋状排列在锥轴上，间隔3～5毫米。种子鳞呈双叶状，几乎从基部开始分开；鳞片没有明显的叶柄，但在与圆锥轴相连的区域有一个铰接处。种鳞各裂片呈椭圆形，中下部最宽；裂片钝尖，边缘完整。苞片鳞片呈扇形。根据裂鳞鱼的记录，这是侏罗纪沉积物中首次报道裂鳞鱼雌球果的种子鳞、有翅种子和营养枝一起保存。这一新发现提供了证据，证实了裂鳞鱼与现存松科的系统发育地位。
Schizolepis daohugouensis sp. nov. is described from the Jurassic sediments of Daohugou flora, from Ningcheng County, Inner Mongolia Autonomous Region, China. The female cone is slender, cylindrical in shape, seed scale complexes are loosely and helically arranged on the cone axis at intervals of 3–5 mm. The seed scales are bilobed and divided almost from the base; the scales have no evident petiole but an articulation at the region of attachment to the cone axis. Each lobe of the seed scales is oval in shape, widest at the lower middle part; lobes are obtusely pointed with entire margins. Bract scale is fan shaped. Based on the records of Schizolepis, this is the first report of the occurrence of female cone of Schizolepis with the seed scales, the winged seeds and vegetative branches preserved together in the Jurassic deposits. The new discovery provides evidence that confirms the phylogenetic position of Schizolepis to the extant Pinaceae.