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Cnidarians (Major Characteristics (Radial symmetry, Biradial Symmetry,…
Cnidarians
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Jellyfish life cycle
- Dioecious medusae produce gametes that are shed into water for fertilization
- forms into a ciliated planula larval form
- Planula settles into the substrate and forms a polyp.
- Polyp buds and makes more polyps and more medusae.
- Medusae break off from polyp and swims away
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Porifera vs. Cnidarians
Sponges
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Feeding: Filter feeder, digestion in amoeboid cells.
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Response to stimuli: No nervous system, cells react to stimuli
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Cnidarians
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Feeding: Captures prey with nematocysts & tentacles, digestion's in gastrovascular cavity
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Response to stimuli: Nerve net around mouth, specific sensory cells
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Polyp vs. Medusa
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Medusa
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Motile (Muscle movement, free-swimming)