Phylum cnidaria

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Mr.J's AP Biology invertebrates project

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Phylum cnidaria

  1. 1. PHYLUM CNIDARIA<br />BY: ANDREW QUINTOIS<br />
  2. 2. FOUR DIVISIONS OF CNIDARIANS<br />1. SCYTHOZOA (jellyfish)<br />2. CUBOZOA (square shaped jellyfish)<br />3. HYDROZOA ( hydras)<br />4. ANTHOZOA ( corals & sea anemones)<br />
  3. 3.
  4. 4. TWO BODY FORMS<br />
  5. 5. CHARACTERISTICS<br />SUPPORT<br />Instead of bones, hydrostatic skeletons use a coelom, or a fluid-filled space separating the digestive tract from the outer body wall..<br />Hydrostatic skeletons are useful for locomotion because of their flexibility. Jellyfish use them to open and close their heads, (known as bells) causing them to move.<br />
  6. 6. CHARACTERISTICS CONT.<br />CELLS AND TISSUES<br />Most Cnidarians are diploblastic (composed of two layers of cells).<br />Outer layer – Ectoderm (epidermis)<br />Inner layer – Endoderm (gastrodermis)<br />These layers contain nerve nets.<br />
  7. 7. CHARACTERISTICS CONT.<br />NERVOUS SYSTEM<br />Cnidarians contain a nerve net.<br />A nerve net is a web like system of neurons. (mainly a characteristic of radially symmetrical animals)<br />
  8. 8. CHARACTERISTICS CONT.<br />RESPIRATION AND CIRCULATION<br />Nutrient molecules are passed by diffusion to the rest of the body from the cells of the gastrodermis.<br />
  9. 9. CHARACTERISTICS CONT.<br />DIGESTION AND EXCRETION<br />The basic body plan of cnidarians is a sac with a central digestive compartment called a gastrovascular cavity (a single opening functioning as both a mouth and anus).<br />
  10. 10. CHARACTERISTICS CONT.<br />REPRODUCTION<br />Cnidarians can reproduce both sexually and Asexually.<br />Asexual reproduction is seen in polyps, while sexual reproduction is seen in medusas.<br />
  11. 11.
  12. 12. CHARACTERISTICS CONT.<br />SYMMETRY<br />All cnidarians have radial symmetry.<br />This means that they have a body shape similar to that of a pie or a barrel.<br />
  13. 13. CHARACTERISTICS CONT.<br />NEMATOCYSTS/TENTACLES<br />The body contains long structures called tentacles that can be moved to capture prey.<br />The tentacles contain stinging cells called cnidocytes and within each one is a capsule called a nematocyst, which discharges to either trap or sting the prey.<br />
  14. 14. LINKS<br />http://www.youtube.com/watch?v=6zJiBc_N1Zk<br />Nematocysts Firing<br />http://www.youtube.com/watch?v=-Tp38DUjUnM&NR=1<br />How Jellyfish sting<br />http://www.youtube.com/watch?v=Kukv0AtIVdU&feature=related<br />Hydra<br />

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