1. Phylum Annelida (Earthworms, Sandworms, Leeches) By: Veronica Weigandt

2. Key Characteristics Bilaterally symmetrical Closed circulatory system Has a nervous system Segmentation True Coelom No true respiratory organs

3. Anatomy Segmented Intestine Anus Nerve Cord Coelom Septa Dorsal/Ventral blood vessel Nephridia Clitellum

4. Anatomy (Cont.) Mouth Pharynx Esophagus Crop Gizzard

5. Digestive 1 way digestion Food goes into mouth Pharynx helps food into mouth Food is stored in crop Gizzard breaks down food Rest goes through intestines

6. Respiration Simple diffusion Oxygen is consumed by body cells Carbon dioxide diffuses through the body surface

7. Internal Transport Closed system of blood vessels Blood pumps through body Circulation

8. Excretion Nephridium Fluid passes through nephridium into bladder-like sac Sac opens through a pore in the skin & waste is discharged

9. Response Has a brain Responds to: – Odors – Changes in moisture – Changes in temperature – Changes in light

10. Movement Various muscle groups Parapodia Setae sinks into the ground Longitudinal muscles contract

11. Reproduction Reproduction is sexual Join head to tail; exchanging sperm Forms mocous sheath Eggs get released into the sheath Worm backs out of sheath Sperm gets released into the sheath & fertilization occurs Cocoon develops

12. Examples Leeche s Sandworms Earthworms

13. Facts Over 22,000 species They live just about anywhere on earth Most are found in wet environments Can grow up to as long as 3 meters Can range in their color, patterning, and other features

14. Literature Cited http://www.bu.edu/gk12/eric/Annelida.pdf http://www.esu.edu/~milewski/intro_biol_two/lab__12_anne l_arthro/Annelida.html http://www.esu.edu/~milewski/intro_biol_two/lab__12_anne l_arthro/Annelida.html http://www.infusion.allconet.org/webquest/annelida.html http://library.thinkquest.org/28751/review/animals/5.html# http://www.biology-questions-and- answers.com/annelids.html http://www.biology-questions-and- answers.com/annelids.html http://www.encyclopedia.com/topic/Annelida.aspx