2. EarthwormsMarine worms Leeches

3. Annelida means “little-rings” Segmented worms Found in freshwater, saltwater, and moist soil

4. Body cavity with organs Bilateral 2 body openings Setae: bristle-like structures on outside of body used to hold on to soil and to move

5. >100 segments Move using setae and 2 sets of muscles in the body wall Eats soil – food moves to crop for storage – gizzard for grinding – intestines for absorption – exits thru the anus

6. Closed-circulatory system Gases exchanged through skin and mucus layer Small brain called ganglia Hermaphrodites – but can’t fertilize themselves

7. No setae Eat blood from other animals Prevent blood coagulation

8. Aerate soil Medical uses Food for other animals