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Cnidaria PowerPoint Presentation

Cnidaria

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Cnidaria

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  1. Cnidaria Jellies

  2. Greek : Cnidos “stinging nettle”

  3. 580 million years ago

  4. HOW ARE THEY SIMILAR TO PHYLUM PORIFERA? No digestive system No circulatory systems Both have 2 cell layers Some are sessile

  5. How are they different from Phylum Porifera? Cells bound by inter-cell connections Muscles Nervous system Have special cells called CNIDOCYTES Some are mobile

  6. Main Charcteristics • What type of symmetry do they have?

  7. What are their stinging cells called? What are they used for? • Have tentacles with stinging cells called____________________. • What are they used for?

  8. Occur in 2 basic forms 1. sessile________ 2. free floating__________

  9. How many tissue layers? tissues composed of 95% or more water How do they move? http://www.pbs.org/kcet/shapeoflife/episodes/move_explo1.html

  10. Reproduction has sexual and asexual stages

  11. Homework: Jelly Life Story http://bcs.whfreeman.com/thelifewire/content/chp32/32020.html

  12. Classification Kingdom Animalia Phylum Cnidaria Class Cubozoa Class Hydrozoa Class Scyphozoa Class Anthozoa

  13. Cubozoa: "box jellies" Mostly found in tropical waters Actively hunts prey Four evenly spaced out tentacles Extremely powerful venom Well-developed, complex eyes-24 in all

  14. Hydrozoa: "polyp colonies" Live in colonies Colonies have separate sexes Some polyps asexually reproduce by budding Polymorphism: specialized polyps

  15. Scyphozoa: "true jellies" Mostly exist as a medusa Found at all depths all over the world Four oral arms Contract muscles to move

  16. Longest animal in the world= Praya @ 120 ft

  17. Anthozoa: "sessile polyps" No medusa stage Symbiotic relationship with zooxanthellae (photosynthetic algae) Corals secrete calcium carbonate Mesenteries (longitudal sheets of tissue)

  18. VENN DIAGRAM