New Fossils Discovered in Yunnan Transform Understanding of Life's Origins on Earth

An international team of scientists from Oxford and Yunnan universities has unveiled groundbreaking research that fundamentally alters the perception of complex life’s emergence on Earth. This discovery, made in Yunnan province in southwestern China, reveals a new fossil site known as the Jiangchuan biota.

At this site, remnants of animals have been preserved that, according to previous theories, should not have existed at that time. Scientists previously believed that the rapid development of biodiversity, known as the 'Cambrian explosion,' began around 535 million years ago. However, new findings, which include over 700 samples dated between 539 and 554 million years, prove that the transformation of life began at least 4 million years earlier, during the late Ediacaran period.

Among the unique discoveries made in Yunnan are the oldest relatives of deuterostomes, which include vertebrates, such as humans. Researchers also found early ancestors of starfish and echinoderms. These creatures had U-shaped bodies, anchored to the seafloor with stalks, and used tentacles for hunting. Some specimens exhibit such a bizarre combination of features that scientists compare them to the fantastical sandworms from the Dune cinematic universe.

A distinctive aspect of the Jiangchuan biota is the method of fossil preservation: instead of the usual impressions in sandstone, carbon films have been found here. This discovery has allowed researchers to observe the tiniest details, such as digestive systems and locomotion organs. According to Dr. Gaorong Li, this finding fills a significant gap in paleontology, demonstrating that the absence of complex animals in older strata from other regions was merely a matter of poor preservation of remains, rather than their actual absence in nature at that time.

The results of this research were published in the journal Science in April 2026. This discovery could serve as a foundation for new studies in paleontology and evolutionary biology, reshaping our understanding of the development of life on Earth and its early stages.