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The Jellyfish

The Jellyfish. Cnidarians have radial symmetry, a gastrovascular cavity, and cnidocytes All animals except sponges Belong to the clade Eumetazoa, the animals with true tissues Phylum Cnidaria Is one of the oldest groups in this clade. Cnidarians

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The Jellyfish

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  1. The Jellyfish • Cnidarians have radial symmetry, a gastrovascular cavity, and cnidocytes • All animals except sponges • Belong to the clade Eumetazoa, the animals with true tissues • Phylum Cnidaria • Is one of the oldest groups in this clade

  2. Cnidarians • Have diversified into a wide range of both sessile and floating forms including jellies, corals, and hydras • But still exhibit a relatively simple diploblastic, radial body plan

  3. The basic body plan of a cnidarian • Is a sac with a central digestive compartment, the gastrovascular cavity • There are two types of body • The polyp, a sessile attached form and • Medusa, a free floating active form • A single opening • Functions as both mouth and anus

  4. Anatomy of a polyp http://webs.lander.edu/rsfox/invertebrates/hydra.html

  5. Anatomy of a medusa http://webs.lander.edu/rsfox/invertebrates/aurelia.html

  6. Cnidarians are carnivores • That use tentacles to capture prey • The tentacles are armed with cnidocytes • Unique cells that function in defense and the capture of prey http://www.tarleton.edu/~biology/pfau/BIOL1214/lectures/2acoelomates/cnidarians.htm

  7. Prey Tentacle “Trigger” Discharge Of thread Nematocyst Coiled thread Cnidocyte A cnidocyte of a hydra Campbell & Reece, Biology, 7th Ed., Pearson

  8. Scyphozoans • In the class Scyphozoa • Jellies (medusae) are the prevalent form of the life cycle • In the class Cubozoa, which includes box jellies and sea wasps • The medusa is box-shaped and has complex eyes • Class Anthozoa includes the corals and sea anemones • Which occur only as polyps

  9. Hydrozoa Physalia

  10. float Digestive polyps Reproductive polyps tentacles

  11. Vellela vellela (By the Wind Sailor) http://www.flickr.com/photos/nativeagle/ 101348346/in/photostream/

  12. Hydrozoa http://animaldiversity.ummz.umich.edu/site/accounts/pictures/Hydrozoa.html

  13. Scyphozoans

  14. Class - Cubozoa Box Jellies

  15. Hydrozoans • Most hydrozoans • Alternate between polyp and medusa forms http://orion1.paisley.ac.uk/courses/Tatner/biomedia/pictures/hydro.htm

  16. An animal that eats jellyfish, the Sunfish

  17. http://www.earthwindow.com/mola.html#

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