1 / 20

Annelida

Annelida. http://surferjerry.com/wp-content/uploads/2009/02/giant-south-african-earthworm.png. Segmented worms. By Emily Chu and Wonhyoung Kim. Classes. Oligochaeta (earthworms and relatives) Polychaeta (polychaetes) Hirudinea (leeches). Leech. Earthworm. Christmas tree worm.

aren
Télécharger la présentation

Annelida

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. Annelida http://surferjerry.com/wp-content/uploads/2009/02/giant-south-african-earthworm.png Segmented worms By Emily Chu and Wonhyoung Kim

  2. Classes • Oligochaeta (earthworms and relatives) • Polychaeta (polychaetes) • Hirudinea (leeches) Leech Earthworm Christmas tree worm http://www.cheshirewildlifetrust.co.uk/IMAGES/watch_earthworm.jpg http://www.microteufel.com/TripReports/Maui/Aquarium/IMG_0063s.jpg http://www.io.com/~dierdorf/leech.jpg

  3. Body Cavity (coelom) • Present • Annelida=coelomate (has a true coelom) http://biology.unm.edu/ccouncil/Biology_203/Images/SimpleAnimals/Coelomate.JPG

  4. Body symmetry • Bilateral symmetry

  5. http://www.mun.ca/biology/scarr/142003_Annelida.jpg

  6. Nervous system • Have brain-like pair of cerebral ganglia • Ventral nerve cords with segmental ganglia (runs through length of body)

  7. Circulatory system • Closed circulatory system—blood contained within vessels • Blood contains oxygen-carrying hemoglobin

  8. Digestive System • Earthworms eat through the soil, extracting nutrients as the soil passes through the alimentary canal. • Have digestive tract http://johnson.emcs.net/life/images/earthworm.jpg

  9. Excretory system • Metanephridium=excretory tubes • Remove waste from the blood and coelomic fluid through exterior pores • Nephrostomes=ciliated funnels

  10. Locomotion/musculature • Chaetae=bristles that provide traction for burrowing • Each segment is surrounded by a longitudinal muscle, which is in turn surrounded by circular muscle. • Contractions of these muscles allow for movement. http://oceanexplorer.noaa.gov/explorations/03windows/logs/jul28/media/naut_allseate_600.jpg

  11. Skeletal type • No true skeleton • Hydrostatic skeleton—controlled by coelomic fluid

  12. Sensory structures/features • Simple sensory structures • Single-celled structures detect light, chemicals, pressure waves, and contact • Some polychaetes have ocelli (“little eyes”)

  13. Reproduction • Hermaphrodites • Earthworms cross-fertilize • Two earthworms exchange sperm then separate • Received sperm are stored temporarily while the clitellum secretes a mucous cocoon • Cocoon slides along the worm, picking up eggs and then the stored sperm • Some earthworms can also reproduce asexually by fragmentation followed by regeneration

  14. Clitellum http://static.howstuffworks.com/gif/willow/earthworm-info0.gif

  15. Gas exchange • SKIN! This is the respiratory organ. • Hemoglobin in blood carries oxygen • Some polychaetes have gills http://upload.wikimedia.org/wikipedia/commons/e/ea/Christmas_tree_worms.jpg

  16. Other Unique features • Today, leeches are used to drain blood that accumulate in tissues following certain injuries. • Leeches secrete hirudin (prevents blood from clotting, which allows leech to feed) • Hirudin has the potential to be used in the future to dissolve blood clots that form during surgery or as a result of heart disease.

  17. THE END!!!!

  18. Just kidding… http://www.breaktaker.com/albums/pictures/animals/LaughingCat.jpg

  19. QUIZ TIME! • What is the primary respiratory organ? • Describe the annelid’s circulatory system. • Give two examples of methods of reproduction and explain each. • Which of these phyla consists of species with a coelom? • Porifera • Cnidaria • Annelida • Platyhelminthes

  20. Check your answers! • The skin • Closed circulatory system • Sexual—two hermaphroditic annelids align and exchange spermclitellum secretes cocoon Asexual—fragmentation and regeneration • C. Annelida

More Related