cnidaria & ctenophora. cnidaria radially symmetrical tentacles contain nematocysts (stinging cells)

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  • Slide 1
  • Cnidaria & Ctenophora
  • Slide 2
  • Slide 3
  • Cnidaria Radially symmetrical Tentacles contain nematocysts (stinging cells)
  • Slide 4
  • Cnidaria Medusa: free-swimming Polyp: sessile
  • Slide 5
  • Class Anthozoa 6000 species, including sea anemones, corals and sea fans. May be solitary or colonial Hexacorallia: 6-part symmetry, hard corals Octocorallia: 8-part symmetry, soft corals
  • Slide 6
  • Class Hydrozoa 2700 species, including Portuguese man-of-war, and fire coral Both polyp and medusa Polyps may be for feeding, defense, and reproduction
  • Slide 7
  • Order Siphonophora Drifting colonies that inhabit tropical and sub-tropical regions Physalia (Portuguese man-of-war) blue sail-like float tentacles may reach several meters below the float.
  • Slide 8
  • Class Scyphozoa 200 species of jellyfish Cold to tropical water 2-40cm (up to 2m) Most jellies can swim horizontally and vertically Aurelia (Moon jelly) Cassiopea or upside- down jellyfish (filter feed / zooxanthellae)
  • Slide 9
  • Class Cubozoa Box jelly or sea wasp (Chironex fleckeri) Strong toxin, causes immediate, extreme pain Death can occur 3-20 min after a sting
  • Slide 10
  • Phylum Ctenophora 8 comb rows Have colloblasts: sticky ends that are used to capture prey Catch food with tentacles
  • Slide 11
  • Comb jellies Bioluminescent All marine Most are pea-size to golf ball-size

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