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phylum Cnidaria

phylum Cnidaria. By Gabriella, Steven, Miguel. Characteristics of Cnidarians. Polyp and medusa body forms Radial symmetry Nematocysts Gastrovascular cavity Asexual Reproduction. Polyp and medusa body forms. Medusa. Ex. Jellyfish. Free-swimming or floating.

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phylum Cnidaria

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  1. phylum Cnidaria By Gabriella, Steven, Miguel

  2. Characteristics of Cnidarians • Polyp and medusa body forms • Radial symmetry • Nematocysts • Gastrovascular cavity • Asexual Reproduction

  3. Polyp and medusa body forms

  4. Medusa • Ex. Jellyfish. • Free-swimming or floating. • Usually have umbrella-shaped bodies. • Usually have tetramerous (four-part) symmetry. • The mouth is usually on the concave side. • The tentacles originate on the rim of the umbrella.

  5. Polyp • Ex. Sea anemones. • Usually sessile. • They have tubular bodies. • One end is attached to the substrate, and a mouth (usually surrounded by tentacles) is found at the other end. • Polyps may occur alone or in groups of individuals.

  6. Radial Symmetry

  7. Nematocysts • Tiny organelles. • Nematocysts are basically stinging cells. • They contain neurotoxins (poison) to immobilize their prey. • Highly efficient devices for capturing prey and extremely effective deterrents to predators.

  8. Reproduction: Alternation of Generations

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