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Phylum Cnidaria. Classes: 1. Coral- Anthozoa 2. Hydra- Hydrozoa 3. Sea Jellies/ Jellyfish- Scyphozoa 4. Sea Anemones- Anthozoa subclass Hexacorallia. Body Structure. A. Polymorphism = more than one body form 1. Polyp 2. Medusa. Polyp. Tube with tentacles
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Phylum Cnidaria Classes: 1. Coral- Anthozoa 2. Hydra- Hydrozoa 3. Sea Jellies/ Jellyfish- Scyphozoa 4. Sea Anemones- Anthozoa subclass Hexacorallia
Body Structure A. Polymorphism = more than one body form 1. Polyp 2. Medusa
Polyp • Tube with tentacles around the mouth • Sessile • “Juvenile” Form Coral polyp
Medusa • Umbrella shape • Tentacles around mouth • Motile, Free-swimming • “Adult” Form
Tentacles • Have nematocysts (stinging cells) • Coiled thread discharges like a harpoon • Contains neurotoxin • Paralyzes prey Discharged nematocyst
Habitat A. Aquatic 1. Most Marine 2. Few fresh-water
Feeding A. Carnivores (predators) B. Process of feeding 1. Tentacles sting prey with nematocysts 2. Tentacles grab prey 3. Prey pulled into mouth Lion’s mane eats another jelly
Ecological Role • Predators and prey • Neurotoxins in medical research • Coral – jewelry, building, reefs (surfing!) • Coral reefs - habitat for many -great biodiversity - protect coastline E. Symbiosis with other organisms