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Nature 410, 461-463 (22 March 2001) | doi:10.1038/35068549;

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An exceptionally preserved vermiform mollusc from the Silurian of England

Studies of the origin and radiation of the molluscs have yet to resolve many issues regarding their nearest relatives, phylogeny and ancestral characters. The Polyplacophora (chitons) and the Aplacophora are widely interpreted as the most primitive extant molluscs, but Lower Palaeozoic fossils of the former lack soft|[nbsp]|parts, and the latter were hitherto unrecognized as fossils.

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