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Phylum Cnidaria Characteristics What the Anemone heck is this? What the heck Jellyfish are these? • Possess stinging cells • Radial symmetry • Two body forms: – 1) Polyps: tubes with mouth and tentacles facing upward – 2) Medusa: Umbrella-shaped with mouth and tentacles downward Asexual Reproduction • Budding: new individual grows from the parent • Genetically identical to parent Sexual Reproduction • Male medusa release sperm into water • Female absorb sperm and eggs fertilized • Larva grows inside females Sexual Reproduction Larva released Sexual Reproduction Larva develop into polyps Sexual Reproduction Young medusa begin to bud off from polyp Sexual Reproduction FF to :40 seconds Young medusa begin to bud off from polyp Sexual Reproduction Medusa grow and mature Jellyfish Life Cycle Cnidarian Anatomy • 2 tissue layers (evolutionary advancement) • 1) Outer layer: • Muscles • Nerves • Stinging cells (cnidocytes) • 2) Inner layer • secretes digestive enzymes • absorbs nutrients • Layer of “jelly” in between (mesoglea) • Gastrovascular cavity: single opening to digest food Cnidarian Anatomy • 2 tissue layers (evolutionary advancement) • 1) Outer layer: • Muscles • Nerves • Stinging cells (cnidocytes) • 2) Inner layer • secretes digestive enzymes • absorbs nutrients • Layer of “jelly” in between (mesoglea) • Gastrovascular cavity: single opening to digest food
