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Phylum Cnidaria : ex: Jellyfish

Phylum Cnidaria : ex: Jellyfish. Characteristics of . Classes and examples of each. Hydrozoa – Portuguese man of war, Hydra and Obelia Scyphozoa – Sea Nettle and Moon Jellyfish Anthozoa – Sea anemones and hard/soft corals. Body plan/tissue description. Radially symmetrical

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Phylum Cnidaria : ex: Jellyfish

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  1. Phylum Cnidaria: ex: Jellyfish Characteristics of

  2. Classes and examples of each • Hydrozoa – Portuguese man of war, Hydra and Obelia • Scyphozoa – Sea Nettle and Moon Jellyfish • Anthozoa – Sea anemones and hard/soft corals

  3. Body plan/tissue description • Radially symmetrical • Gastrovascular cavity • Stinging cells – cnidocyte • Tentacles that capture prey - nematocyst • Tissues – endoderm, ectoderm and mesoglea • 2 body forms: Polyp and medusa

  4. How does it reproduce • Sexually – male and female, sperm and egg, internal and external fertilization • Asexually – polyp stage and budding • Hermaphrodites

  5. How does it get nutriets • Predators • Poison prey with nematocysts which are located in cnidocytes • prey going into gastrovascular cavity for digestion, enzymes are released

  6. Vocabulary • Radial symmetry • A body plan in which an organism can be divided into equal parts around a central axis. • Cnidocyte • Cells that contain the organelle called nematocyst. • Nematocyst • Stinging organelles that may contain poisons. • Gastrovascular cavity • A body cavity that functions as a mouth and anus and aids in digestion and circulation. • Polyp • Sessile adult; attached to a substrate with tentacles radiating from one end. • Medusa • Free-floating stage in the life cycle of cnidarians

  7. Homework: Review of Cnidarians

  8. Venn Diagram Sponges Cnidarians • radial symmetry • predators • tissues • polyp/medusa • tentacles/mouth • gastrovascular cavity • stinging cells • Asymmetry • Filter feeder • No tissues • 2 layers • no organs • no respiratory or circulatory system • hermaphrodites

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