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Chapter 33 Section 2 Cnidaria and Ctenophora Phylum Cnidaria Body Plan • Freshwater hydra, stinging jellyfish, & flowerlike coral • Medusa- bell-shaped • Polyp- vase-shaped Cnidaria- Body Plan • Epidermis- outer layer • Gastrodermis- inner layer • Mesoglea- between epidermis & gastrodermis • Gastrovascular cavity- single opening or mouth • Tentacles- flexible extensions CnidariaFeeding/Defense • Cnidocytes- specialized cells used for defense and capturing prey • Nematocyst- cnidocyte organelle, long filament coiled up Cnidaria- Nervous System • Nerve net- diffuse web of interconnected nerve cells Cnidaria Classes • Class Hydrozoa • Portuguese man-of war • Hydra Cnidaria Classes • Class Cubozoa • Box jellyfish Cnidaria Classes • Class Scyphozoa • Jellyfish Cnidaria Classes • Class Anthozoa • Sea anemones & corals Phylum Ctenophora • “Comb-like”/ Comb jellies • Move by beating their cilia • Have cells called colloblasts, which secrete a sticky substance that binds to their prey- located on two tentacles Phylum Ctenophora • Sensory structure- apical organables ctenophores to sense their orientation in water • Bioluminescence- production of light by means of a chemical reaction REVIEW!!! • Describe how cnidarians feed. • Name one organism from each of the 4 cnidarian classes. • Compare and contrast cnidarians and ctenophores.
