墨西哥二叠纪Bjuvia和Nilsonia的新记录

IF 2 4区 地球科学 Q1 Earth and Planetary Sciences
Miguel A. Flores-Barragan, M. P. Velasco-de León
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引用次数: 1

摘要

在墨西哥的二叠纪发现了两个新属:cf Bjuvia和Nils-sonia。连同先前已知的带翼虫,这些证实了在墨西哥上古生界存在Cyca-dophytes。这大大增加了这一群体的地理和时间分布,并提供了有关这些植物生长的环境类型的信息。新的报告来自墨西哥普埃布拉州Matzitzi地层的两个地方,分别是卡雷特拉(Ca)和科特佩克(Co)。在第一个地方,我们发现了具有大尺寸单叶特征的材料,叶脉垂直于轴且总是平行的,以及具有乳头的气孔器。来自普埃布拉的材料的碎片性质只允许与苏铁目的Bjuvia有亲缘关系。其他标本属于带翼虫和尼尔森虫。从卡雷特拉报道的Nilssonia,有一个节段的椎板附着在脊柱的上部。Tae-niopteris的特征是整个椎板,通常狭窄,静脉垂直于轴,分叉一次或几次。在科特佩克首次报道了lentriculiformis和crassinervis两种。和这些属一起
本文章由计算机程序翻译,如有差异,请以英文原文为准。
New records of Bjuvia and Nilssonia from the Permian of Mexico
Two new genera have been identified in the Permian of Mexico: cf Bjuvia and Nils-sonia. Along with previously-known Taeniopteris , these confirm the presence of Cyca-dophytes in the upper Paleozoic of Mexico. This substantially increases the geographical and temporal distribution of this group and provides information on the type of environment in which these plants developed. The new reports come from two localities of the Matzitzi Formation, in the state of Puebla, Mexico, called Carretera (Ca) and Coatepec (Co). In the first locality, we identified material characterized by the presence of a simple leaf of large size with veins perpendicular to the rachis and always parallel, as well as a stomatal apparatus with papillae. The fragmentary nature of the material from Puebla allows only an affinity to Bjuvia of the order Cycadales. Other specimens are assigned to Taeniopteris and Nilssonia . The Nilssonia reported from Carretera, has a segmented lamina attached to the rachis on the upper side. Tae-niopteris is characterized by an entire lamina, generally narrow, with veins originating perpendicularly to the rachis that dichotomizes one or several times. The species T. lentriculiformis and T. crassinervis are reported for the first time from Coatepec. Together with these genera
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来源期刊
Palaeontologia Electronica
Palaeontologia Electronica 地学-古生物学
CiteScore
3.60
自引率
0.00%
发文量
20
审稿时长
>12 weeks
期刊介绍: Founded in 1997, Palaeontologia Electronica (PE) is the longest running open-access, peer-reviewed electronic journal and covers all aspects of palaeontology. PE uses an external double-blind peer review system for all manuscripts. Copyright of scientific papers is held by one of the three sponsoring professional societies at the author''s choice. Reviews, commentaries, and other material is placed in the public domain. PE papers comply with regulations for taxonomic nomenclature established in the International Code of Zoological Nomenclature and the International Code of Nomenclature for Algae, Fungi, and Plants.
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