近日,云南大学丛培允团队报道了显生宙的黎明:中国西南埃迪卡拉纪晚期的过渡动物群。这一研究成果发表在2026年4月2日出版的《科学》杂志上。
埃迪卡拉纪—寒武纪过渡时期的动物多样化是地球历史上的一次关键事件,从根本上改变了我们的星球及其生物圈。然而,埃迪卡拉纪的化石组合与寒武纪的化石组合之间重叠有限,使得动物门类分化的关键阶段变得模糊不清。
研究组报道了一个新的埃迪卡拉纪末期化石组合,以碳质薄膜的形式保存于中国西南云南的江川生物群中。该组合与同时期的其他地点不同,同时保存了埃迪卡拉纪的实体化石以及可识别的非两侧对称动物、两侧对称动物的实体化石和遗迹化石。其中包括多种蠕虫状动物以及最古老的后口动物(步带动物的干群)。这一发现为两侧对称动物——这一最多样化、形态差异最大的动物类群——的辐射演化提供了新的认识。
附:英文原文
Title: The dawn of the Phanerozoic: A transitional fauna from the late Ediacaran of Southwest China
Author: Gaorong Li, Fan Wei, Wenwen Wen, Xiaodong Wang, Xiangtong Lei, Ross P. Anderson, Yang Zhao, Frances S. Dunn, Luke A. Parry, Peiyun Cong
Issue&Volume: 2026-04-02
Abstract: Animal diversification across the Ediacaran-Cambrian transition was a crucial event in Earth history, fundamentally altering our planet and its biosphere. However, Ediacaran fossil assemblages show limited overlap with those from the Cambrian, obscuring the critical interval when the animal phyla were diversifying. We report a new terminal Ediacaran fossil assemblage preserved as carbonaceous films from the Jiangchuan Biota, Yunnan, Southwest China. This assemblage diverges from coeval sites, preserving Ediacaran body fossils alongside recognizable nonbilaterians and bilaterian body and trace fossils. These include diverse vermiform animals and the oldest deuterostomes (stem-group ambulacrarians). Our discovery provides insight into the radiation of Bilateria, the most diverse and disparate animal clade.
DOI: adu2291
Source: https://www.science.org/doi/10.1126/science.adu2291
