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Nematoda: Roundworms

Nematoda: Roundworms . First phylum to have the Complete digestive tract: mouth and anus Pseudocoelomate: fluid filled between endoderm and mesoderm Hydrostatic skeleton under pressure which means only one shape is possible (tapered hotdog). Phylum Nematoda.

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Nematoda: Roundworms

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  1. Nematoda: Roundworms • First phylum to have the Complete digestive tract: mouth and anus • Pseudocoelomate: fluid filled between endoderm and mesoderm • Hydrostatic skeleton under pressure which means only one shape is possible (tapered hotdog)

  2. Phylum Nematoda • Reproduction is usually sexual—females are generally larger than males. • Fertilization is internal, and a female can deposit 100,000 or more fertilized eggs per day. • The zygotes of most species are resistant cells capable of living in harsh conditions. Hookworm

  3. Roundworms Pinworm Ascaris: intestinal roundworm 1,000,000 cases in USA: 1.2 billion worldwide Heartworm

  4. Ascaris life cycle

  5. Removal of Guinea Worm http://www.youtube.com/watch?v=mUz9gqLmyQ0

  6. nematodes • http://www.youtube.com/watch?v=JBLemM3tzRM soil nematodes • http://www.youtube.com/watch?v=gmFHnQKbSM8 lymphatic filariasis (elephantiasis) 1 billion worldwide

  7. Annelida: segmented worms Polychaetes, earthworms, leeches Eucoelomate Segmented body plan Closed circulatory system Protostome: opening in gastrula becomes the mouth

  8. Annelida: key structures Bristles on side Aortic arches

  9. leeches Fused segments to allow for blood storage Blood thinner released to help sucking

  10. http://www.youtube.com/watch?v=DZig6EL5B6A&feature=PlayList&p=F648EFCC1BE6AAA3&playnext=1&index=10http://www.youtube.com/watch?v=DZig6EL5B6A&feature=PlayList&p=F648EFCC1BE6AAA3&playnext=1&index=10 Earthworms in Australia Earthworms are hermaphroditic. They fertilize each other with the clitellum secreting a mucus sack to collect the eggs and sperm. This sack is then placed into the ground until babies are developed.

  11. annelids • Polychaete: clamworm • http://www.youtube.com/watch?v=LdHzRNdz2HU

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