假定的奥陶纪绿藻Krejciella被重新解释为enteropneust half - hordate tube(捷克)

IF 2 4区 地球科学 Q1 Earth and Planetary Sciences
O. Fatka, J. Vodička
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引用次数: 2

摘要

Enteropneusta的化石和现存代表在解释棘皮动物、半足动物和脊索动物的早期进化中起着重要作用。然而,化石enteropnesta的遗迹是罕见的。对奥陶纪推定绿藻Krejciella putzkeri Obrhel 1968的有机管状标本的重新检查显示,与寒武纪Margaretia dorus Walcott, 1931的形态没有任何差异。后一种最近被解释为一种有机管,由蠕虫状的半翅虫Oesia disjuncta Walcott, 1911产生并居住。然而,奥陶纪标本中缺乏地下侧向伸展,排除了Krejciella和Margaretia的同义种。分类为Margaretia Walcott, 1931的寒武系有机管的地理分布可能受纬度控制,因为在寒武系古地理图中,所有有机管的分布明显局限于热带和亚热带带。相比之下,本文研究的克雷希氏菌标本的出现仅限于西冈瓦纳的冷水地区。对含有一个Krejciella标本的岩石样本进行的微体古生物学分析表明,存在中度保存的几丁质动物,包括地带性物种Linochitina pissotensis。该分类群首次在布拉格盆地中发现,并确定了样品的中晚奥陶世边界区间。本文所研究的Krejciella标本,在地层和古地理上都将半长尾藻(enteropnest半长尾藻)产生的有机管的记录扩展到了中晚奥陶世冷水区。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Putative Ordovician green alga Krejciella reinterpreted as enteropneust hemichordate tube (Czech Republic)
Fossil and extant representatives of Enteropneusta play an important role in the interpretation of early evolution of animals, such as echinoderms, hemichordates and chordates. However, remains of fossil Enteropneusta are rare. Re-examination of available specimens of organic tubes of the Ordovician putative green alga Krejciella putzkeri Obrhel 1968 does not show any morphological difference from the Cambrian Margaretia dorus Walcott, 1931. The latter species has been recently interpreted as an organic tube produced and inhabited by the worm-like enteropneust hemichordate Oesia disjuncta Walcott, 1911. However, the absence of the subterranean lateral extension in Ordovician specimens excludes the synonymy of Krejciella and Margaretia . Geographic distribution of Cambrian organic tubes classified as Margaretia Walcott, 1931 indicates a possible latitudinal control, as all occurrences are apparently restricted to tropical and subtropical belts when plotted in Cambrian palaeogeographic maps. In comparison, the occurrence of the herein studied specimens of Krejciella is restricted to cold-water localities of West Gondwana. The micropalaeontological analy-sis of a rock sample bearing one specimen of Krejciella shows the presence of moder-ately preserved chitinozoans, including the zonal species Linochitina pissotensis . This taxon is, for the first time, documented from the Prague Basin and determines the Mid-dle/Late Ordovician boundary interval of the analysed sample. The herein studied specimens of Krejciella extend the record of organic tubes produced by enteropneust hemichordates both stratigraphically and palaeogeographically to the Middle/Late Ordovician cold-water area.
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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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