The discovery, in 500-million-year-old rocks, of fossil acorn worms that lived in tubes illuminates the debate about whether the ancestor of vertebrates was a mobile worm-like animal or a sessile colony dweller. See Letter p.503
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Notes
*This article and the paper under discussion1 were published online on 13 March 2013.
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Gee, H. Tubular worms from the Burgess Shale. Nature 495, 458–459 (2013). https://doi.org/10.1038/nature11963
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DOI: https://doi.org/10.1038/nature11963
