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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 copyright cmassengale 2
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Cnidarian Characteristics
Radial symmetry Have a single opening (serves as both mouth and anus) Tentacles Carnivores! Nickname: Flowers of the Animal Kingdom copyright cmassengale 3
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Cnidarian Characteristics
Either tubular or bell shaped Tentacles Only animal with cnidocytes (stinging cells) and Nematocysts – coiled, harpoon-like stinger inside that shoots out copyright cmassengale 4
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Cnidocyte Coiled nematocyst copyright cmassengale
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Barbed, threaded stinger copyright cmassengale
Nematocyst Barbed, threaded stinger capsule’s lid trigger nematocyst copyright cmassengale 6
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Cnidarians Cnidarians are two types: 1) Polyps (stationary) 2) Medusas (free swimming) copyright cmassengale
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Two Main Body Plans of Cnidarians
UPRIGHT TENTACLES TENTACLES HANG DOWN Polyp epidermis mouth mesoglea gastrodermis Medusa Mesoglea THICK Mesoglea THIN copyright cmassengale
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Cnidarian Diversity Scyphozoans: Jellyfish Anthozoans: Sea anemones Corals Hydrozoans: Hydra Cubozoa Box Jellies copyright cmassengale 11
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Cnidarian Diversity Coral polyps Jellyfish Sea Anemone Coral polyps copyright cmassengale 12
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Anthozoans copyright cmassengale
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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 copyright cmassengale
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Sea Anemones & Coral Corals build a limestone case which build up & form coral reefs ANEMONE CORAL copyright cmassengale 15
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Distribution of Coral Reefs
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Hydrozoans copyright cmassengale
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Hydrozoans Hydra Exist only as polyps Reproduce by budding Freshwater only copyright cmassengale 18
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Hydra copyright cmassengale 19
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Hydra Feeding copyright cmassengale 20
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Food in Gastrovascular Cavity copyright cmassengale
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Scyphozoan Characteristics
Jellyfish Medusa is the body form Stinging tentacles
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Parts of a Jellyfish 23 23
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Some Jellyfish Show Luminescence
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Ctenophoran Characteristics
Called comb jellies All marine Bioluminescent copyright cmassengale
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Ctenophore
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