An international research team led by Prof. Zhang Huaqiao from the Nanjing Institute of Geology and Palaeontology of the Chinese Academy of Sciences (NIGPAS) has reported the discovery of extraordinary early Cambrian (ca. 535 million years ago, or Ma) microfossils preserving the introvert musculature of cycloneuralians, a group of animals that includes roundworms, horsehair worms, mud dragons, and many other creatures.
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Source: Phys.org