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The Polychaeta or bristle worms are a group within the Annelida. The Polychaeta include the Serpulids. Serpulids form a hard tubular chalk skeleton that can fossilize easily. The jaw parts of polychaetes are found as microfossils.
Reconstruction of a jaw system of a brisle worm from the Ordovician (Photo Olle Hints)
Photos or locations of Polychaeta at this site
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