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Daily Activity 4-12-2012 Get out your notebooks and be prepared to take notes on Cnidaria.
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Phylum Porifera Sponges Phylum Cnidaria Jellyfish, corals.....
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Don’t forget – sponges are animals and belong to the Animal Kingdom 1. Multicellular 2. No organs or body systems 3. Cellular digestion (heterotrophic) 4. Asymmetry
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Sponges are SESSILE – they do not move They obtain food by FILTER FEEDING
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Reproduce sexually (sperm and eggs) Reproduce asexually (regeneration) Skeleton composed of spongin (soft) and spicules (hard)
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Sponge Anatomy
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Amebocytes - cells within the sponge that move around supplying nutrients and taking away waste
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Pacific Northwest Locals Purple Sponge
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Cnidarians - jellyfish, coral, hydra, sea anemone *Named after the stinging cells found on their tentacles called CNIDOCYTES
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Characteristics of Cnidarians · Tentacles · Cnidocytes (stinging cells)
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· Nematocysts (barbs) · Gastrovascular cavity (digestion)
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Most Cnidarians have radial symmetry
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Cnidarians have two body forms: polyp (vase shaped) medusa (cup shaped)
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Portuguese Man of War - cnidarian that floats in the water and has long tentacles
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Pacific Northwest Locals Egg Yolk Jellyfish Giant Lion’s Mane Jellyfish http://www.calvintang.com/blog/2007/06/giant-jellyfish Fish Eating Anemone Crimson Anemone White Spotted Rose Anemone
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The Hydra is a freshwater cnidarian What kind of symmetry does hydra have? Is it a medusa or a polyp?
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Hydra Predatory animals They can be found in most unpolluted fresh- water ponds, lakes, and streams in the temperate and tropical regions and can be found by gently sweeping a collecting net through weedy areas. Hydras are generally sedentary or sessile, but do occasionally move quite readily, especially when hunting.
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Video of hydra at http://www.microscopyu.com/moviegallery/pondscum/hydra/ http://www.microscopyu.com/moviegallery/pondscum/hydra/
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Pacific Northwest Locals Pink Mouth Hydroid
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Coral Reefs are made from the skeletons of cnidarians
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Pacific Northwest Locals Cup Coral Soft Coral
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Multimedia Sponge Images and Videos - http://www.junglewalk.com/video/Sponge-movie.htm http://www.junglewalk.com/video/Sponge-movie.htm Cnidarian Images and Videos - http://www.junglewalk.com/video/Coelantrate-movie.htm http://www.junglewalk.com/video/Coelantrate-movie.htm General Invertebrate Movies at National Geographic --- really good video on the portuguese man of war (under invertebrates) Hydra Video at http://www.schooltube.com/video/55045/Hydrahttp://www.schooltube.com/video/55045/Hydra
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