1 / 11

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.

warner
Download Presentation

Nematoda: Roundworms

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related