Rhipidopsis in the upper Permian of the Dead Sea region, Jordan – Another clade of Mesozoic gymnosperms in the Permian?

约旦死海地区二叠纪上部的Rhipidopsis – 二叠纪中生代裸子植物的另一个分支？

基本信息

批准号：
444573967
负责人：
Professor Dr. Hans Kerp
金额：
--
依托单位：
Forschungsstelle für Paläobotanik
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2020
资助国家：
德国
起止时间：
2019-12-31 至 2020-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/444573967?language=en
关键词：
Rhipidopsis upper Permian Dead Sea

项目摘要

In recent years, the upper Permian of the Dead Sea region (Jordan) has yielded a rich and varied flora. This flora is of special interest because: (1) it is one of the very few rich and diverse late Permian floras, (2) of its superb preservation with excellent cuticles which enable whole-plant reconstructions, (3) it consists of a mixture of elements from different floral provinces, i.e. Euramerica, Cathaysia and Gondwana, and (4) of the precocious occurrences of major plant clades so far only known from the Mesozoic. Funds are requested for fieldwork in two newly discovered, hardly exploited localities in the Umm Irna Formation and for studying this material. Rhipidopsis foliage is particularly common in these localities and found in close association with a peculiar type of fructification that is so far unknown. Rhipidopsis is commonly regarded as an early ginkgophyte. However, a first screening shows that the stomata are very different from those of ginkgophytes and that the associated fructification looks very Caytonia-like. The Caytoniales are a small Mesozoic group of seed-ferns that is often regarded as ancestral to the flowering plants. The aim of this small project is to collect new material in order to test the hypothesis that Rhipidopsis is of caytonialean affinity.

近年来，死海地区（约旦）的二叠纪上部产生了丰富多样的植物群。这种植物群之所以特别令人感兴趣，是因为：（1）它是极少数丰富多样的晚二叠世植物群之一，（2）其保存完好，具有极好的角质层，可以重建整个植物，（3）它由一种混合物组成来自不同花卉省份（即欧美、华夏和冈瓦纳）的元素，以及（4）迄今为止仅在中生代已知的主要植物进化枝的早熟发生。需要资金在乌姆伊尔纳地层两个新发现的、几乎没有开发过的地点进行实地考察并研究这些材料。拟蓟草叶子在这些地方特别常见，并且与迄今为止未知的特殊类型的果实密切相关。拟针菊通常被认为是一种早期的银杏植物。然而，第一次筛选表明，其气孔与银杏植物的气孔非常不同，并且相关的果实看起来非常像银杏属。 Caytoniales 是一小类中生代种子蕨类植物，通常被认为是开花植物的祖先。这个小项目的目的是收集新材料，以检验拟菊属具有caytonialean亲和力的假设。