2026-01-29 中国科学院(CAS)
Soft-bodied fossils from the Huayuan biota. (Image by Prof. ZHU Maoyan’s team)
<関連情報>
- https://english.cas.cn/head/202601/t20260129_1147584.shtml
- https://www.nature.com/articles/s41586-025-10030-0
最初の顕生代大量絶滅後のカンブリア紀の軟体生物群 A Cambrian soft-bodied biota after the first Phanerozoic mass extinction
Han Zeng,Qi Liu,Fangchen Zhao,Cui Luo,Dezhi Wang,Yuyan Zhu,Yao Liu,Kai Chen,Zhixin Sun,Yanjie Hong,Lanyun Miao,Chunlin Hu,Haijing Sun,Bing Pan,Jialin Zhao,Zongjun Yin,Guoxiang Li,Xinglian Yang,Aihua Yang,Shixue Hu & Maoyan Zhu
Nature Published:28 January 2026
DOI:https://doi.org/10.1038/s41586-025-10030-0
Abstract
Cambrian Burgess Shale-type (BST) fossil biotas document nearly complete snapshots of the oldest Phanerozoic marine ecosystems1,2,3,4. However, the rarity of deposits bearing high-diversity BST biotas5 has restricted our understanding of the evolutionary and ecological dynamics of the Cambrian explosion. Here we report the Huayuan biota—a lower Cambrian (Stage 4, approximately 512 million years ago) BST Lagerstätte from an outer shelf, deep-water setting of the Yangtze Block in Hunan, South China. The Huayuan biota yields remarkable taxonomic richness, comprising 153 animal species of 16 phylum-level clades dominated by arthropods, poriferans and cnidarians, among which 59% of species are new. The biota is comprised overwhelmingly of soft-bodied forms that include preserved cellular tissues. The complex ecosystem contained diverse radiodonts and pelagic tunicates, filling a gap of high-diversity BST biotas from the Cambrian Stage 4. Critically, multivariate ordination based on a global dataset of Cambrian BST biotas places the Huayuan biota within a main transition of marine animal ecosystems between Cambrian Age 3 and Age 4. Network analysis reveals close faunal connections between the Huayuan and Burgess Shale biotas, indicating transoceanic dispersal. Dated shortly after the Sinsk event6,7,8, the Huayuan biota illuminates differences in the impacts of this extinction in shallow- versus deep-water settings during the first Phanerozoic mass extinction and offers critical insights into the transformation of global ecosystems in the early Cambrian.
