1. Cnidarians & Ctenophorans
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Phylum Cnidaria
Most are marine (jellyfish, coral, sea anemones, Portuguese man-of war, hydras)
Note:Hydras are found in freshwater
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3. Cnidarian Characteristics
Radial symmetry
Have a single opening (serves as both mouth and anus)
Tentacles
Carnivores!
Nickname: Flowers of the Animal Kingdom
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4. Cnidarian Characteristics
Either tubular or bell shaped
Tentacles
Only animal with cnidocytes (stinging cells) and Nematocysts – coiled, harpoon-like stinger inside that shoots out
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Cnidocyte
Coiled nematocyst
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6. Barbed, threaded stinger copyright cmassengale
Nematocyst
Barbed, threaded stinger
capsule’s lid
trigger
nematocyst
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Cnidarians
Cnidarians are two types:
1) Polyps (stationary)
2) Medusas (free swimming)
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9. Two Main Body Plans of Cnidarians
UPRIGHT TENTACLES
TENTACLES HANG DOWN
Polyp
epidermis
mouth
mesoglea
gastrodermis
Medusa
Mesoglea THICK
Mesoglea THIN
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Cnidarian Diversity
Scyphozoans:
Jellyfish
Anthozoans:
Sea anemones
Corals
Hydrozoans:
Hydra
Cubozoa
Box Jellies
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Cnidarian Diversity
Coral polyps
Jellyfish
Sea Anemone
Coral polyps
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Anthozoans
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14. Anthozoan Characteristics
Sea Anemones
Brightly colored & Resemble flowers
Solitary polyps
Feed on invertebrates & fish
Corals
Most are colonial
Build limestone case
Live as polyps in their case
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Sea Anemones & Coral
Corals build a limestone case which build up & form coral reefs
ANEMONE
CORAL
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16. Distribution of Coral Reefs
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Hydrozoans
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Hydrozoans
Hydra
Exist only as polyps
Reproduce by budding
Freshwater only
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Hydra
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Hydra Feeding
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21. Food in Gastrovascular Cavity copyright cmassengale

22. Scyphozoan Characteristics
Jellyfish
Medusa is the body form
Stinging tentacles

23. Parts of a Jellyfish 23 23

24. Some Jellyfish Show Luminescence24 24

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26. Ctenophoran Characteristics
Called comb jellies
All marine
Bioluminescent
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27. Ctenophore