8 phylum cnidaria

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8 phylum cnidaria

  1. 1. Phylum Cnidaria The Stingers
  2. 2. Classes• Hydrozoa• Anthozoa• Scyphozoa
  3. 3. Shared Traits• Radial symmetry• Carnivorous• Reproduce sexually and asexually• Polyp and medusa form – Polyp: sac-like stage with waving tentacles, nonmotile and benthic – Medusa: bell-like stage, hanging tentacles, motile and planktonic
  4. 4. Body Layers & Parts• Ectoderm/Epidermis: outside layer containing stinging cells (nematocysts)• Tentacles: used for food capture, lined with nematocysts• Endoderm/Gastrodermis: lines the gut, cells here aid in digestion (absorption of stung prey)• Mesoglea: jelly-like substance found between the above two layers• Mouth and anus are the same opeining
  5. 5. Polyp Phase and Medusa Phase
  6. 6. Nematocysts• Coiled firing cells that shoot toxin into prey• Most not deadly to humans as they aren’t usually able to penetrate our skin• Some fatal
  7. 7. Class Anthozoa• Largest group of Cnidarians• Stay polyps their whole lives• Solitary or colonial• Example: Sea Anemones, Corals
  8. 8. Class Anthozoa
  9. 9. Class Anthozoa
  10. 10. Class Hydrozoa• Can have just a polyp stage, just a medusa stage, or both• Can join to form complex colonies, like Portuguese Man O’ War (see next slide)
  11. 11. Class Hydrozoa
  12. 12. Class Scyphozoa• Medusa is the dominant life stage• Move with rhythmic contractions
  13. 13. Class Scyphozoa

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