Cnidarians & Ctenophorans copyright cmassengale 1
copyright cmassengale Phylum Cnidaria Most are marine (jellyfish, coral, sea anemones, Portuguese man-of war, hydras) Note:Hydras are found in freshwater copyright cmassengale 2
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
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
copyright cmassengale Cnidocyte Coiled nematocyst copyright cmassengale
Barbed, threaded stinger copyright cmassengale Nematocyst Barbed, threaded stinger capsule’s lid trigger nematocyst copyright cmassengale 6
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copyright cmassengale Cnidarians Cnidarians are two types: 1) Polyps (stationary) 2) Medusas (free swimming) copyright cmassengale
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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copyright cmassengale Cnidarian Diversity Scyphozoans: Jellyfish Anthozoans: Sea anemones Corals Hydrozoans: Hydra Cubozoa Box Jellies copyright cmassengale 11
copyright cmassengale Cnidarian Diversity Coral polyps Jellyfish Sea Anemone Coral polyps copyright cmassengale 12
copyright cmassengale Anthozoans copyright cmassengale
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
copyright cmassengale Sea Anemones & Coral Corals build a limestone case which build up & form coral reefs ANEMONE CORAL copyright cmassengale 15
Distribution of Coral Reefs copyright cmassengale 16
copyright cmassengale Hydrozoans copyright cmassengale
copyright cmassengale Hydrozoans Hydra Exist only as polyps Reproduce by budding Freshwater only copyright cmassengale 18
copyright cmassengale Hydra copyright cmassengale 19
copyright cmassengale Hydra Feeding copyright cmassengale 20
Food in Gastrovascular Cavity copyright cmassengale
Scyphozoan Characteristics Jellyfish Medusa is the body form Stinging tentacles
Parts of a Jellyfish 23 23
Some Jellyfish Show Luminescence 24 24
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Ctenophoran Characteristics Called comb jellies All marine Bioluminescent copyright cmassengale
Ctenophore