A new species of the extinct genus Austrohamia (Cupressaceae s.l.) in the Daohugou Jurassic flora of China and its phytogeographical implications
A new species of the extinct genus Austrohamia (Cupressaceae s.l.) in the Daohugou Jurassic flora of China and its phytogeographical implications
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DOI：
10.1111/j.1759-6831.2011.00165.x
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发表时间：
2012-01
影响因子：
3.7
通讯作者：
Jianwei Zhang;A. D’Rozario;Li-jun Wang;Ya Li;Jian-xin Yao
中科院分区：
文献类型：
--
作者：
Jianwei Zhang;A. D’Rozario;Li-jun Wang;Ya Li;Jian-xin Yao
摘要本文报道了一种新的针叶树--刺苞澳汉木（Austrohamia acanthobractea，sp. nov.）描述了内蒙古道虎沟侏罗纪植物群。这些材料由保存完好的多叶树枝和树枝以及排卵锥所代表的印模组成。多叶的嫩枝具至少两级分枝;末级的小枝互生或近对生与螺旋状安排的叶，下延的在基部具上部圆形的端部;背腹扁平和单脉。卵形球果椭圆形，长不到1厘米，顶生在末级和次末级枝上，由螺旋排列的苞片组成，胚珠分布在苞片的正面。在太平洋两岸存在相似的，如果不是相同的分类群，表明原始柏科在泛大陆的东亚（欧亚大陆）和南美洲之间的世界性分布。
Abstract A new conifer, Austrohamia acanthobractea, sp. nov., is described from the Jurassic Daohugou flora, Inner Mongolia Autonomous Region, China. The material consists of impressions represented by well‐preserved leafy twigs and branches as well as ovulate cones. Leafy shoots with at least two orders of branching; ultimate branchlets alternate or sub‐opposite with helically arranged leaves, decurrent at base with distal rounded tip; dorsiventrally flattened and univeined. Ovuliferous cones elliptical, less than 1 cm long, terminally borne on ultimate and penultimate branches, composed of helically arranged bracts with ovules disposed on their adaxial surfaces. The presence of similar, if not identical taxa, on both sides of the Pacific indicates the cosmopolitan distribution of primitive Cupressaceae between East Asia (Eurasia) and South America in the Pangaea.