Exceptionally preserved radiodont arthropods from the lower Cambrian (Stage 3) Qingjiang Lagerstätte of Hubei, South China and the biogeographic and diversification patterns of radiodonts

IF 2.3 2区地球科学 Q1 PALEONTOLOGY

Papers in Palaeontology Pub Date : 2024-08-22 DOI:10.1002/spp2.1583

Yu Wu, Stephen Pates, Mingjing Zhang, Weiliang Lin, Jiaxin Ma, Cong Liu, Yuheng Wu, Xingliang Zhang, Dongjing Fu

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Abstract

The Cambrian (Series 2, Stage 3) Qingjiang Lagerstätte of South China is one of the most diverse Burgess Shale‐type deposits around the world, yielding abundant non‐biomineralized fossils. Radiodonta, a taxonomically and ecologically diverse stem‐euarthropod group, has been generally thought to represent the largest consumers in early Palaeozoic marine ecosystems. Here we describe several new radiodont specimens from the Qingjiang Lagerstätte assigned to various groups, including Stanleycaris qingjiangensis sp. nov., a new type of hurdiid head carapace, one possible Hurdia carapace, and two partial appendages with uncertain affinities. These specimens not only extend the geographic and stratigraphic range of these taxa, they also illuminate the diversity of radiodonts (in particular hurdiids) in their early evolutionary history. Radiodont palaeobiogeographic patterns are visualized using network analysis. Laurentia and South China share many members at the genus level, Anomalocaris is the most cosmopolitan taxon, but most genera are endemic. Radiodonts show a high initial diversity that declines through the early Palaeozoic, enabling three diversification phases of radiodonts to be recognized: the thriving phase (Cambrian Series 2), declining phase (Cambrian Miaolingian) and terminal phase (Cambrian Furongian to Ordovician Floian).

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华南湖北下寒武统（第三期）清江滩异常保存的放射虫节肢动物及其生物地理和多样性模式

华南寒武纪（第 2 系第 3 阶段）清江页岩沉积是世界上最多样化的伯吉斯页岩型沉积之一，出土了丰富的非生物矿化化石。桡足类是一个在分类学和生态学上具有多样性的茎突类动物群，通常被认为是古生代早期海洋生态系统中最大的消费者。在这里，我们描述了来自清江古城的几件新的桡足类标本，这些标本被归入不同的类群，包括Stanleycaris qingjiangensis sp.这些标本不仅扩大了这些类群的地理和地层范围，而且揭示了辐射生物（尤其是飓风虫）在其早期演化史中的多样性。辐射生物的古生物地理格局通过网络分析得以直观呈现。劳伦提亚和华南在属级上共享许多成员，Anomalocaris是最具世界性的类群，但大多数属是地方性的。放射虫在古生代早期表现出较高的初始多样性，随后逐渐衰退，因此可将放射虫的多样化分为三个阶段：繁荣阶段（寒武纪第 2 系）、衰退阶段（寒武纪庙岭期）和终结阶段（寒武纪芙蓉期至奥陶纪弗洛期）。

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

Papers in Palaeontology PALEONTOLOGY-

CiteScore

4.50

自引率

4.30%

发文量

期刊介绍： Papers in Palaeontology is the successor to Special Papers in Palaeontology and a journal of the Palaeontological Association (www.palass.org). The journal is devoted to the publication of papers that document the diversity of past life and its distribution in time and space. Papers in Palaeontology is devoted to the publication of papers that document the diversity of past life and its distribution in time and space. As a sister publication to Palaeontology its focus is on descriptive research, including the descriptions of new taxa, systematic revisions of higher taxa, detailed biostratigraphical and biogeographical documentation, and descriptions of floras and faunas from specific localities or regions. Most contributions are expected to be less than 30 pp long but longer contributions will be considered if the material merits it, including single topic parts. The journal publishes a wide variety of papers on palaeontological topics covering: palaeozoology, palaeobotany, systematic studies, palaeoecology, micropalaeontology, palaeobiogeography, functional morphology, stratigraphy, taxonomy, taphonomy, palaeoenvironmental reconstruction, palaeoclimate analysis, biomineralization studies.