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Annelidae

Learn about the general characteristics, organ systems, and classes of Annelidae. Discover how these creatures navigate their environment and reproduce through a fascinating video.

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Annelidae

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  1. Annelidae These guys try to worm their way into all ways of life

  2. Typical dissection approach

  3. I. General Characteristics • A. Bilateral symmetry • B. Cephalization • C. Coelom • D. Complete digestive tract • E. Segmentation • F. Nephridia • G. Circulatory system • H. Hydrostatic skeleton

  4. II. Organ systems • A. Digestive System • 1. muscular pharynx • 2. esophagus • 3. crop • 4. gizzard • 5. intestine

  5. B. Nervous system • 1. ganglia • 2. ventral nerve cord

  6. C. Circulatory system • 1. closed circulatory system • 2. dorsal blood vessel • 3. five pairs of pseudohearts • 4. ventral blood vessel • 5. capillary network

  7. D. Reproductive system • 1. hermaphroditic • 2. male parts • 3. swapping of sperm • 4. clitellum • 5. female parts impossible to find for average

  8. The Great Exchange

  9. Fertilized eggs released in a cocoon

  10. E. Excretory system-nepridium • 1. almost every segment has a nepridium

  11. nephridium

  12. III. Classes of annelids • A. Oligochaets • 1. setae not huge • 2. useful for anchorage during locomotion • 3. sequence of muscle contraction

  13. B. Polychaets • 1. parapodia • 2. much more elaborate • 3. locomotion • 4. moving fluid through tubes • 5. excavation in marine worms • 6. respiratory surfaces

  14. Polychaet-feather duster worm

  15. Christmas Tree Worm

  16. C. Hirunidea-leeches • One of man’s best friends

  17. Wonderful story • http://www.youtube.com/watch?v=ak6MX-QFRVc&NR=1 http://www.youtube.com/watch?v=SxZbzZ5RE40&feature=related

  18. Cross section • 1. coelom • 2. dorsal blood vessel • 3. ventral nerve cord • 4. muscle layers • 5. typhlosole • 6. nephridia • 7. setae

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