Umaltolepis and associated Pseudotorellia leaves from the Middle Jurassic of Yima in Henan Province, Central China
Umaltolepis and associated Pseudotorellia leaves from the Middle Jurassic of Yima in Henan Province, Central China
复制标题
中国河南省义马中侏罗世的 Umaltolepis 和相关的 Pseudotorellia 叶
DOI：
10.1016/j.revpalbo.2019.104111
复制
发表时间：
2019-12-01
影响因子：
1.9
通讯作者：
Shi, Gongle
中科院分区：
文献类型：
--
作者：
Dong, Chong;Zhou, Zhiyan;Shi, Gongle
种子结构 Umaltolepis 被认为是由 Pseudotorellia 叶子的相同植物产生的，这是基于它们在同一化石承载层中的剂量关联以及它们角质层的相似性，尤其是气孔结构。在本文中，我们描述了来自中国中部河南省义马中侏罗统义马组的 Umaltolepis 和 Pseudotorellia 的新材料。伊马榆十一月是伞状、卵形至椭圆形、四裂的罩杯。杯罩裂片是树脂质的，具有厚的外角质层和分散的、或多或少纵向定向的气孔。伊马假托雷利亚 sp. 的叶子。十一月狭倒披针形，有两条脉进入叶基部并二分一次或两次，产生4-6条平行脉，这些脉在叶尖附近会聚并连接在一起。叶子在相邻的叶脉之间有纺锤形的树脂体，厚的角质层在背面有分散的、纵向的气孔。伊马 U. yimaensis 和 P. yimaensis 的气孔非常相似，均由下沉的保卫细胞组成，周围有专门的侧向附属细胞和非特化的极细胞，并且在气孔坑两侧都有两个弓形角质层脊，在保卫细胞和附属细胞之间有一个蝴蝶状的凸缘。伊马组中 U. yimaensis 和 P. yimaensis 的共生及其角质层结构和树脂体存在的相似性进一步证实 Umaltolepis 和 Pseudotorellia 是由同一类植物产生的。这些化石也为华中地区中侏罗世银杏植物生殖器官的高度多样性提供了新的证据。 (C) 2019 Elsevier B.V. 保留所有权利。
The seed-bearing structure Umaltolepis is considered to be produced by the same plants of Pseudotorellia leaves based on their dose association in the same fossil bearing horizon and similarities in their cuticles, especially in stomatal structures. In this paper we describe new material of Umaltolepis and Pseudotorellia from the Middle Jurassic Yima Formation in Yima, Henan Province, Central China. Umaltolepis yimaensis sp. nov. is an umbrella-like, ovate to elliptical, four-lobed cupule. The cupule lobes are resinous with thick outer cuticle, and scattered, more or less longitudinally oriented stomata. Leaves of Pseudotorellia yimaensis sp. nov. are narrowly oblanceolate, with two veins entering leaf base and dichotomizing once or twice to produce 4-6 parallel veins that converge and join together near leaf apex. The leaves have fusiform resin bodies between neighboring veins, and thick cuticles with scattered, longitudinally oriented stomata on the abaxial side. The stomata of U. yimaensis and P. yimaensis are very similar, both consisting of sunken guard cells surrounding by specialized lateral subsidiary cells and unspecialized polar cells, and both have two bow-shaped cuticular ridges flanking the stomatal pit and a butter-fly like flange between guard and subsidiary cells. The co-occurrence of U. yimaensis and P. yimaensis in the Yima Formation and their similarities in cuticular structures and in the presence of resin bodies further confirm that Umaltolepis and Pseudotorellia are produced by the same group of plants. These fossils also provide new evidence for a high diversity of ginkgophyte reproductive organs in the Middle Jurassic of Central China. (C) 2019 Elsevier B.V. All rights reserved.