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Polychaetes
Libr0409.jpg
A variety of marine worms
from Das Meer, M.J. Schleiden (1804–1881).
Scientific classification
Kingdom:
Phylum:
Class:
Polychaeta

Grube, 1850
Christmas tree worms (Spirobranchus giganteus) from East Timor.
Sabellastarte indica
Tomopteris from plankton

Polychaetes, or bristle worms, are a class of annelid worms.

They are generally found in a marine environment. There are more than 10,000 known species in this class. They are ancient animals, dating back to 518 million years ago. They are first found in the early Cambrian fossil beds of Sirius Passet in Greenland.

Each of their body segments has some fleshy protrusions that stand out. These 'parapodia' have many bristles, which are made of chitin. This is different from the Oligochaeta, which are similar in form, but only have a few bristles.

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