1. Invertebrates

2. Asymmetrical (no symmetry at all) No true body cavities (coeloms), just cells and tissues surrounding a water- filled space. Debate on whether a sponge is multicellular or colonial.

3. Sponges http://www.youtube.com/watch?v=RmPTM 965-1c (sponges)http://www.youtube.com/watch?v=RmPTM 965-1c http://www.youtube.com/watch?v=KOFFz XNYJG0 (sponges)http://www.youtube.com/watch?v=KOFFz XNYJG0 http://www.youtube.com/watch?v=IyUFG_ F3090 (choanocytes)http://www.youtube.com/watch?v=IyUFG_ F3090

4. Intracellular digestion There is no digestion in the spongocoel.

5. Amoebocyte: named because they move by pseudopods, - take food from the choanocyte, form the skeletal fibers (spicules) Spongin: a network of flexible fiber proteins in body wall Spicules: fibers made from the amoebocyte, they are sharp and made from calcium carbonate or silica. Function: provide structural support as well as defense against predators.

7. Choanocyte: flagellated cells, also called collar cells, that line the spongocoel and trap food Porocytes: donut shaped pores that open and close to control water flow Ostia: small pores in the walls of sponges, water enters Osculum: large opening that water flows out of, under certain conditions cells around the osculum contract (open and close) Spongocoel: the central cavity of a sponge

10. Radial symmetry (infinite lines of symmetry) Two germ layers (TRUE germ layers): Diploblastic No coelom Extracellular digestion in the gastrovascular cavity Cnidaria

11. Cnidarin: general body plan

12. Cnidocytes with nematocyst harpoons: namesake of the phylum BeforeAfter Bumps are the cnidocytes

14. Planula larvae Ciliated larva stage of jellyfish and corals

15. Cnidaria: Scyphozoa

16. http://www.youtube.com/watch?v=v9j9iO6Zy 4o&feature=PlayList&p=E9E1093124E2F9C 9&playnext=1&index=3; jellyfish movementhttp://www.youtube.com/watch?v=v9j9iO6Zy 4o&feature=PlayList&p=E9E1093124E2F9C 9&playnext=1&index=3 http://www.youtube.com/watch?v=M9MMp7 QX6e0&feature=PlayList&p=E9E1093124E2 F9C9&playnext=1&index=2 polyp stagehttp://www.youtube.com/watch?v=M9MMp7 QX6e0&feature=PlayList&p=E9E1093124E2 F9C9&playnext=1&index=2 http://www.youtube.com/watch?v=1mIo7YB5 DKY&feature=PlayList&p=E9E1093124E2F 9C9&playnext=1&index=1 more polyphttp://www.youtube.com/watch?v=1mIo7YB5 DKY&feature=PlayList&p=E9E1093124E2F 9C9&playnext=1&index=1

17. Jellyfish bloom

18. Portuguese Man-of-War are colonies of four kinds of highly modified polyps: feeding polyps, reproductive polyps, etc.. Hydra Hydra catching food: http://www.youtube.com/watch?v =Kukv0AtIVdU&feature=related http://www.youtube.com/watch?v =Kukv0AtIVdU&feature=related Hydra; http://www.youtube.com/watch?v =yqXkaZwiu6s&feature=related http://www.youtube.com/watch?v =yqXkaZwiu6s&feature=related Cnidaria: hydrozoa

19. Anthozoa: flowering cnidarians Sea anemone Corals

20. Reef evolution

21. Reef types Fringing reef Barrier reef atoll

22. Ctenophora: close relatives to cnidarians Comb jellies: secrete jelly instead of the stinging nematocysts of the cnidarians Colloblasts are the jelly making cells

23. Ctenophora: comb jellies

24. Comb jellies http://www.youtube.com/watch?v=G7WT8 1ukHZEhttp://www.youtube.com/watch?v=G7WT8 1ukHZE