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首页> 外文期刊>Brazilian Journal of Geology >Epidermal morphology of the cordaitalean leaf Noeggerathiopsis brasiliensis nom. nov. from the southern Paraná Basin (Lower Permian, Rio Bonito Formation) and paleoenvironmental considerations
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Epidermal morphology of the cordaitalean leaf Noeggerathiopsis brasiliensis nom. nov. from the southern Paraná Basin (Lower Permian, Rio Bonito Formation) and paleoenvironmental considerations

机译：巴西堇菜Noeggerathiopsis brasiliensis nom的表皮形态。十一月南部巴拉那盆地（下二叠统，里奥博尼图组）和古环境因素

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摘要

A Brazilian cordaitalean leaf is reassigned and redescribed based on cuticular analysis. The new name Noeggerathiopsis brasiliensis is erected as a replacement for Rufloria gondwanensis Guerra-Sommer. The leaf adpressions come from a tonstein layer within a Sakmarian coal seam of the Faxinal Coalfield, southern Paraná Basin, Brazil (U-Pb SHRIMP mean age 291 ± 1.3 Ma, Rio Bonito Formation). The leaf micromorphological pattern, observed under optical transmitted light and field emission gun - scanning electron microscopy, is distinct from the Euramerian Cordaites Unger and very similar to the Angaran Rufloria Meyen. The lower epidermis has conspicuous longitudinal stomatiferous furrows typical of Noeggerathiopsis (Feistmantel) McLoughlin & Drinnan covered by tightly interwoven trichomes, epidermal and probably also hypodermal highly cutinized sheaths at the borders of furrows, and haplocheilic stomatal apparati surrounded by long conical trichomes. The xeromorphic cuticle structures are similar to those of Glossopteris pubescens (Guerra-Sommer) Degani-Schmidt & Guerra-Sommer, the dominant leaf species preserved in the tonstein layer, indicating convergent ecological adaptations to abiotic stress factors in distinct plant groups in the peat-forming paleoenvironment.
机译：根据表皮分析，重新分配并重新描述了巴西堇菜叶。竖立了新名称巴西象鼻虫（Noeggerathiopsis brasiliensis），以替代印度红花菌Guerra-Sommer。叶片压痕来自巴西巴拉那盆地南部的法基纳尔煤田萨克曼人煤层内的一个色母层（U-Pb SHRIMP平均年龄为291±1.3 Ma，里奥博尼图组）。在光学透射光和场发射枪-扫描电子显微镜下观察到的叶片微观形态模式不同于欧亚堇青石昂格尔，并且与安加拉·鲁弗洛里亚·梅延非常相似。下表皮有明显的纵向口齿沟，典型的是Noeggerathiopsis（Feistmantel）McLoughlin＆Drinnan，被紧密交织的毛状体覆盖，在表皮和在表皮的交界处还可能是近表皮高度角质化的鞘，并被长圆锥形的毛状体包围。干燥形态的表皮结构类似于毛豆Glossopteris pubescens（Guerra-Sommer）Degani-Schmidt＆Guerra-Sommer的结构，它们保留在tonstein层中，是优势叶种，表明泥炭地不同植物群对非生物胁迫因子的生态适应性趋同。形成古环境。

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