Leaf scar and petiole anatomy reveal Pecopteris lativenosa Halle is a marattialean fern

IF 1.6 4区 地球科学 Q2 PALEONTOLOGY
Dandan Li , Weiming Zhou , Mingli Wan , Shijun Wang , Jun Wang
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引用次数: 0

Abstract

Pecopteris (Brongniart) Sternberg is a morphological fossil genus with a cosmopolitan distribution during the Permo–Carboniferous, of which most species belong to the marattialean and or “filicalean” ferns or less frequently to pteridosperms. The taxonomic affinity is uncertain unless distinctive reproductive organs or rachis anatomy is known. Among the numerous species of Pecopteris in the Permian Wuda Tuff Flora, Inner Mongolia, China, Pecopteris lativenosa Halle has been considered as a pteridosperm based on its larger variation of frond morphology, although evidence of fertile organs or rachises are unknown. Newly discovered specimens of this species from the Wuda Tuff Flora are mostly impression fossils. However, some have partially permineralized petioles and have fronds in organic connection to Caulopteris-type stem. Fronds are tripinnate; penultimate pinnae lengths are variable as are ultimate pinnae lengths. Pinnules are oval and thick, and their midveins are straight and are of stable thickness. Lateral veins are dense, bifurcating 1–3 times. Petiole and rachises are anatomically preserved and show sclerenchyma, fundamental tissue and vascular tissue. Vascular bundles of petioles and rachises are C-shaped with two laterally inrolled ends, which are typically stewartiopterid petiole/rachis of Marattiales. These features allow us to assign Pecopteris lativenosa to the late Paleozoic marattialean family Psaroniaceae.

叶疤和叶柄解剖表明,凤头蕨属蕨类植物
Pecopteris (Brongniart) Sternberg是二叠纪-石炭纪广泛分布的一个形态化石属,其中大部分属属麻蕨和(或)“丝状”蕨类,较少属属蕨类。分类学上的亲缘关系是不确定的,除非独特的生殖器官或轴解剖已知。在内蒙古二叠纪乌达凝灰岩植物区系的众多翼类植物中,由于其叶片形态变化较大,因此被认为是一种翼类植物,尽管没有证据表明其有生殖器官或轴。乌达凝灰岩区系新发现的标本多为印染化石。有的叶柄部分过矿化,叶与茎型茎有机连接。叶子是三羽状的;副翅长度是可变的,因为是最终的翅长度。小叶呈椭圆形,粗,中脉直,厚度稳定。侧脉密,分枝1-3次。叶柄和轴解剖保存完好,显示厚壁组织、基本组织和维管组织。叶柄和轴的维管束呈c形,两端向外侧卷绕,典型的叶柄/轴为翼鸟叶柄/轴。这些特征使我们可以将凤蝶归入晚古生代的马齿苋科。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Geobios
Geobios 地学-古生物学
CiteScore
3.30
自引率
6.20%
发文量
28
审稿时长
6-12 weeks
期刊介绍: Geobios publishes bimonthly in English original peer-reviewed articles of international interest in any area of paleontology, paleobiology, paleoecology, paleobiogeography, (bio)stratigraphy and biogeochemistry. All taxonomic groups are treated, including microfossils, invertebrates, plants, vertebrates and ichnofossils. Geobios welcomes descriptive papers based on original material (e.g. large Systematic Paleontology works), as well as more analytically and/or methodologically oriented papers, provided they offer strong and significant biochronological/biostratigraphical, paleobiogeographical, paleobiological and/or phylogenetic new insights and perspectices. A high priority level is given to synchronic and/or diachronic studies based on multi- or inter-disciplinary approaches mixing various fields of Earth and Life Sciences. Works based on extant data are also considered, provided they offer significant insights into geological-time studies.
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