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Cnidaria & Ctenophora

Cnidaria & Ctenophora. Cnidaria. Radially symmetrical Tentacles contain nematocysts (stinging cells). Cnidaria. Medusa : free-swimming Polyp : sessile. Class Anthozoa. 6000 species, including sea anemones, corals and sea fans. May be solitary or colonial

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Cnidaria & Ctenophora

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  1. Cnidaria & Ctenophora

  2. Cnidaria • Radially symmetrical • Tentacles contain nematocysts (stinging cells)

  3. Cnidaria • Medusa: free-swimming • Polyp: sessile

  4. 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

  5. Class Hydrozoa • 2700 species, including Portuguese man-of-war, and fire coral • Both polyp and medusa • Polyps may be for feeding, defense, and reproduction

  6. 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.

  7. 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)

  8. Class Cubozoa Box jelly or sea wasp (Chironex fleckeri) • Strong toxin, causes immediate, extreme pain • Death can occur 3-20 min after a sting

  9. Phylum Ctenophora • 8 comb rows • Have colloblasts: sticky ends that are used to capture prey • Catch food with tentacles

  10. Comb jellies • Bioluminescent • All marine • Most are pea-size to golf ball-size

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