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A putative triradial macrofossil from the Ediacaran Jiangchuan Biota
iScience ( IF 4.6 ) Pub Date : 2024-01-09 , DOI: 10.1016/j.isci.2024.108823
Mingsheng Zhao 1 , Giovanni Mussini 2 , Yulan Li 3 , Feng Tang 4 , Patricia Vickers-Rich 5, 6 , Ming Li 4 , Ailin Chen 7
iScience ( IF 4.6 ) Pub Date : 2024-01-09 , DOI: 10.1016/j.isci.2024.108823
Mingsheng Zhao 1 , Giovanni Mussini 2 , Yulan Li 3 , Feng Tang 4 , Patricia Vickers-Rich 5, 6 , Ming Li 4 , Ailin Chen 7
Affiliation
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The late Ediacaran Jiangchuan biota, from the Dengying Formation in eastern Yunnan, is well-known for its diverse macroalgal fossils, opening a window onto eukaryotic-dominated ecosystems from the late Neoproterozoic of South China. Although multiple lines of evidence suggest that metazoans had already evolved by the late Ediacaran, animal fossils have not yet been formally described from this locality. Here, we report a putative disc-shaped macrofossil from the Jiangchuan biota, Lobodiscus tribrachialis gen. et sp. nov. This specimen shows the triradial symmetry characteristic of trilobozoans, a group of Ediacaran macrofossils previously documented in Australia and Russia. Lobodiscus could record the youngest known occurrence of trilobozoans, strengthening taxonomic and ecological continuities between the Ediacaran “White Sea” and “Nama” assemblages. Our findings may expand the known paleogeographical distribution of trilobozoans and provide data for Ediacaran biostratigraphic correlations across the Yangtze block and globally, helping to track the diversification of early metazoan-grade organisms.
中文翻译：
来自埃迪卡拉纪江川生物群的推定三桡状大型化石
江川埃迪卡拉纪晚期生物群产自云东灯影组，以其多样化的大型藻类化石而闻名，为了解华南新元古代晚期真核生物为主的生态系统打开了一扇窗。尽管多条证据表明后生动物在埃迪卡拉纪晚期已经进化而来，但尚未正式描述来自该地区的动物化石。在这里，我们报道了来自江川生物群的推定的圆盘状大型化石 Lobodiscus tribrachialis gen. et sp. nov.该标本显示了三叶虫的三径向对称特征，三叶虫是一组先前在澳大利亚和俄罗斯记录的埃迪卡拉纪大型化石。Lobodiscus 可以记录已知最年轻的三叶虫出现，加强了埃迪卡拉纪“白海”和“Nama”组合之间的分类学和生态连续性。我们的研究结果可能会扩大已知的三叶虫的古地理分布，并为整个长江块体和全球的埃迪卡拉纪生物地层相关性提供数据，有助于追踪早期后生动物级生物的多样化。
更新日期：2024-01-09
中文翻译：
来自埃迪卡拉纪江川生物群的推定三桡状大型化石
江川埃迪卡拉纪晚期生物群产自云东灯影组，以其多样化的大型藻类化石而闻名，为了解华南新元古代晚期真核生物为主的生态系统打开了一扇窗。尽管多条证据表明后生动物在埃迪卡拉纪晚期已经进化而来，但尚未正式描述来自该地区的动物化石。在这里，我们报道了来自江川生物群的推定的圆盘状大型化石 Lobodiscus tribrachialis gen. et sp. nov.该标本显示了三叶虫的三径向对称特征，三叶虫是一组先前在澳大利亚和俄罗斯记录的埃迪卡拉纪大型化石。Lobodiscus 可以记录已知最年轻的三叶虫出现，加强了埃迪卡拉纪“白海”和“Nama”组合之间的分类学和生态连续性。我们的研究结果可能会扩大已知的三叶虫的古地理分布，并为整个长江块体和全球的埃迪卡拉纪生物地层相关性提供数据，有助于追踪早期后生动物级生物的多样化。
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