1. Cnidaria & Ctenophora

3. Cnidaria Radially symmetrical Tentacles contain nematocysts (stinging cells)

4. Cnidaria Medusa: free-swimming Polyp: sessile

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

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

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.

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)

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

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

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