Kingdom Animalia Cnidaria The Stingers - Ms. Francis...
Transcript of Kingdom Animalia Cnidaria The Stingers - Ms. Francis...
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Kingdom Animalia
Cnidaria
The Stingers
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Cnidaria Objectives Advances over sponges
General body plan of medusa and polyp
General life cycle
Dominant stages in 3 classes
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Phylum Cnidaria Characteristics and Advances:
1. Have true tissues
Diploblastic!
2. Radial Symmetry
3. Have a nerve net nervous system (statocysts – balance receptor and ocelli – simple eye)
4. Incomplete digestive system
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Phylum Cnidaria 5. Show “Alternation of
Generations” with a polyp and medusa stage
6. Contain Cnidocytes (nematocysts)
7. Are all predators
8. Reproduce asexually by budding and sexually by motile gametes
9. Found in both fresh and salt water
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General Cnidarian Life Cycle
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Phylum Cnidaria
Class Hydrozoa
Polyp stage is dominant
Medusa is used for species dispersal
Examples: Hydra sp. and Obelia sp.
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Obelia Life Cycle
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Phylum Cnidaria Class Anthozoa
Generally have polyp stage only
Include: anemones, corals and sea pens
Brain coral
Sea Anemone
Sea Pen
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Coral Body Plan:
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Phylum Cnidaria
Class Scyphozoa
Medusa stage is dominant
Includes the jellies
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Videos Superjelly Fish
https://www.youtube.com/watch?v=NbpB5F9CcLc
Jellyfish Invasion
https://www.youtube.com/watch?v=eyCigZ_bsTM