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PYLUM ANNELIDA – segmented worms

PYLUM ANNELIDA – segmented worms. Annelids. Representative species – common earthworm Have a coelom – fluid filled body cavity surrounded by a mesoderm (room for organs) Have a peritoneum (membrane in the coelom in which all organs are attached)

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PYLUM ANNELIDA – segmented worms

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  1. PYLUM ANNELIDA – segmented worms

  2. Annelids • Representative species – common earthworm • Have a coelom – fluid filled body cavity surrounded by a mesoderm (room for organs) • Have a peritoneum (membrane in the coelom in which all organs are attached) • Have 2 sets of muscle tissue. 1. body wall muscles – to move the worm and 2. digestive system muscles to move food through the system

  3. Class Oligochaeta: Earthworms ``It may be doubted whether there are any other animals which have played so important a part in the history of the world as the earthworm.`` -Charles Darwin, 1881 http://mypeoplepc.com/members/arbra/bbb/id19.html

  4. Class Oligochaeta: Earthworms • 2500 species • Many more cell layers than flat and round worms • Have blood to carry gases to and from body tissues (circulation) • Blood in earthworms contains a red protein hemoglobin (just like in us!) • Have 5 hearts near the anterior end

  5. Earthworms cont… • More complex digestive system than other worm phyla • They consume dirt (food and sand particles) via mouth, esophogus, pharynx, and then stores it in the crop. • After storage, food moves to the gizzard to be ground down, then to the intestine for digestion and absorption into the blood stream. • Undigested food moves out the anus

  6. Earthworms cont… • Setae are bristles that aid in mvmt.; each segment has 4 setae (except first and last ones) • Complex NS • Reproduce sexually • Hermaphrodites

  7. Other ANNELIDS • Class Hirudinea – leeches (blood sucking parasites)

  8. Class Polychaeta – marine worms

  9. Worm Grunting/Charming http://www.youtube.com/watch?v=VjRxUVLxdYI http://www.youtube.com/watch?v=IGviTYCFksE

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