-Segmented bodies
-Coelomates
-Most species have setae
-Closed circulatory sytst.
-Well developed nervous syst.
Class:Polychaeta
-Largest class
-Free-living/tube dwelling marine worms
-Have parapodis
Class Oligochaeta
-Most are terrestrial worms
-Some are marine/fresh water worms
-ex:)earthworms
Class:Hirudinea
-No satea/paropodis
-Habitat fresh water/moist tropical areas
-Scavengers/predators
-Bloodsucking external parasites
-ex:)leeches
