A class of marine annelid worms that comprises the bristle worms.
- These include some Foraminiferida, Hydrozoa and Scleractinia, Bryozoa, Brachiopoda, Pelecypoda, Polychaeta, and Cirripedia.
- In traditional classification schemes, the Annelida consists of the Polychaeta and the Clitellata (the latter including the Oligochaeta and Hirudinida).
- The phylum Annelida is traditionally divided into three classes: Oligochaeta, Hirudinida, and Polychaeta (marine annelids).
Modern Latin (plural), from Greek polu- 'many' + khaitē 'mane' (taken to mean 'bristle').
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