Biology Notes 3-17-08

Biology Notes 3-17-08 - Biology Notes March 17, 2008...

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Biology Notes March 17, 2008 Cnidarians Life Cycle : -Planula larvae -Polyp -Medusa (which produces egg and sperm) Body System of a Cnidarian: -simple nerve nets -epithelial cells with muscle fibers -predators, using toxins in the nematocysts to subdue prey -use nematocysts to harpoon prey and then reel it in 11,000 species of Cnidarian: -Scyphozoans – Jelly fish -Medusa stage dominates the life cycle -individuals are male or female -fertilized egg becomes a planula larva that settles quickly and grows into a polyp. -The polyp buds off small medusa -Anthozoans – sea anemones, sea pens and corals -sea anemones are solitary, large -sea pens are colonial, with two types of polyps. Primary polyps anchor in the sediments; secondary feeding polyps are produced by budding. - Corals are also colonial. -Polyps of most species secrete a matrix of organic molecules on which they deposit calcium carbonate – forms its skeleton. -Living polyps form a layer on top of layer of a growing mass of skeletal
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This note was uploaded on 05/02/2008 for the course BIOL 102 taught by Professor Hill/smith during the Spring '08 term at Idaho State University.

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Biology Notes 3-17-08 - Biology Notes March 17, 2008...

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