Daily Activity 4-12-2012 Get out your notebooks and be prepared to take notes on Cnidaria.
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Transcript of Daily Activity 4-12-2012 Get out your notebooks and be prepared to take notes on Cnidaria.
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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 PoriferaSponges
Phylum Cnidaria
Jellyfish, corals .....
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• Don’t forget – sponges are animals and belong to the Animal Kingdom
1. Multicellular2. No organs or body systems3 . 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/
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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 CoralSoft Coral
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Multimedia
Sponge Images and Videos - http://www.junglewalk.com/video/Sponge-movie.htm
Cnidarian Images and Videos - 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/Hydra