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Polychaetes are a marine class of annelid worms. Each body segment has a pair of fleshy protrusions called parapodia that bear many bristles, called chaetae, which are made of chitin. Polychaeta means "many-bristled" and polychaetes are referred to as bristle worms. More than 10,000 species are described in this class.

Photo Credit: (del) (cur) 23:05, 1 July 2005 . . Kils (Talk | contribs) . . 1061×722 (131,419 bytes) (tomopterus image uwe kils gfdl self)

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