It requires a quirk of fossilization for the soft parts of an animal to be preserved. Study of such a specimen of the mysterious machaeridians provides these organisms with a well defined evolutionary home.
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Caron, JB. Ancient worms in armour. Nature 451, 133–134 (2008). https://doi.org/10.1038/451133a
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DOI: https://doi.org/10.1038/451133a
