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Sponges and Cnidarians

Sponges and Cnidarians. Objectives: Explain how sponges feed and reproduce. List classes, identify representatives, and list characteristics. Phylum Porifera "pore bearers". Sponges Salt – fresh water Vaselike or encrusting. Phylum Porifera "pore bearers". Characteristics Skeleton

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Sponges and Cnidarians

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  1. Sponges and Cnidarians Objectives: Explain how sponges feed and reproduce. List classes, identify representatives, and list characteristics.

  2. Phylum Porifera "pore bearers" • Sponges • Salt – fresh water • Vaselike or encrusting

  3. Phylum Porifera "pore bearers" Characteristics • Skeleton • spongin (elastic fibers) • spicules (hard siliceous) • calcareous structures • Assymetrical body form • body contains small openings (pores) • Feeding: filter water through pores

  4. Sponge Reproduction • Asexually • buds break off and grow into separate sponges • sexually using male and female gametes

  5. http://www.pbs.org/kcet/shapeoflife/episodes/origins_explo1.htmlhttp://www.pbs.org/kcet/shapeoflife/episodes/origins_explo1.html

  6. Phylum Cnidaria "able to sting" Types of Cnidarians • Class Hydrozoa (Portuguese Man-of-War) • Class Scyphozoa (jellyfish) • Class Anthozoa (sea anemones, corals)

  7. Phylum Cnidaria "able to sting" Characteristics • able to sting • occur in one of two body forms: polyp (sea anemone, coral) or medusa (jellyfish) • have radial symmetry – similar body parts are arranged and repeated around a central axis

  8. Feeding • carnivores (animals that prey on other animals) • tentacles are arranged around a central mouth • nematocysts (stinging cells) to stun and capture prey which bring food to mouth into gut

  9. Cnidarian Reproduction • Sexual • Asexual - budding

  10. http://www.youtube.com/watch?v=BpKKGB-ivQo • http://www.youtube.com/watch?v=RYVHK2vM1_Y

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