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8 phylum cnidaria
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8 phylum cnidaria

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  • 1. Phylum Cnidaria The Stingers
  • 2. Classes• Hydrozoa• Anthozoa• Scyphozoa
  • 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. 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. Polyp Phase and Medusa Phase
  • 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. Class Anthozoa• Largest group of Cnidarians• Stay polyps their whole lives• Solitary or colonial• Example: Sea Anemones, Corals
  • 8. Class Anthozoa
  • 9. Class Anthozoa
  • 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. Class Hydrozoa
  • 12. Class Scyphozoa• Medusa is the dominant life stage• Move with rhythmic contractions
  • 13. Class Scyphozoa

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