Annelida consists of the segmented worms in the major taxa ...

Annelida consists of the segmented worms in the major classes Polychaeta (bristleworms), and Oligochaeta (earthworms and relatives), with a total of about 12,000 known species in marine, freshwater, and terrestrial environments. Most annelids have chitinous bristles, or chaetae, secreted by epidermal cells, that project from the body. ................
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