Cnidarians Ctenophorans - PowerPoint PPT Presentation

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    1. 1 Cnidarians & Ctenophorans copyright cmassengale

    2. 2 copyright cmassengale

    3. 3 Phylum Cnidaria About 9000 species Most are marine (jellyfish, coral, sea anemones, Portuguese man-of war) Hydras are found in freshwater All have arm-like tentacles copyright cmassengale

    4. 4 Cnidarian Characteristics Radial symmetry Hollow gut -Gastrovascular cavity has single opening (serves as both mouth and anus) Two tissue layers (diploblastic) Outer epidermis and inner gastrodermis copyright cmassengale

    5. 5 Cnidarian Characteristics Either tubular or bell shaped Tentacles surround mouth Only animal with cnidocytes (stinging cells) found in the tentacles Nematocyst coiled, harpoon-like stinger inside cnidocyte that shoots out copyright cmassengale

    6. 6 Cnidarian Characteristics Cnidocytes contain poison to paralyze prey Tentacles bring food into mouth Inner gastrodermis secretes digestive juices into gastrovascular cavity which digests food and circulates nutrients copyright cmassengale

    7. 7 Extracellular Digestion copyright cmassengale

    8. 8 Cnidocyte copyright cmassengale

    9. 9 Nematocyst copyright cmassengale

    10. 10 copyright cmassengale

    11. 11 Cnidarian Systems Have a simple nerve net & sensory receptors Muscles help in directional movement & capturing prey copyright cmassengale

    12. 12 copyright cmassengale

    13. 13 Two Main Body Plans of Cnidarians copyright cmassengale

    14. 14 copyright cmassengale

    15. 15 Cnidarian Diversity Scyphozoans: Jellyfish Anthozoans: Sea anemones Corals Hydrozoans: Hydra Cubozoa Box Jellies copyright cmassengale

    16. 16 Cnidarian Diversity copyright cmassengale

    17. 17 copyright cmassengale

    18. 18 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

    19. 19 Sea Anemones & Coral Exist only as Polyps Clownfish live in anemone tentacles Corals build a limestone case which build up & form reefs copyright cmassengale

    20. 20 Distribution of Coral Reefs copyright cmassengale

    21. 21 copyright cmassengale

    22. 22 Hydrozoans Hydra Exist only as polyps Reproduce by budding Freshwater only Form resistant zygotes when environment is bad Move by somersaulting with tentacles copyright cmassengale

    23. 23 copyright cmassengale

    24. 24 copyright cmassengale

    25. 25 copyright cmassengale

    26. 26 Colonial Hydrozoan (not a single organism Tentacles sting prey such as fish & humans Polyps in colony feed Has gas-filled air float copyright cmassengale

    27. 27 copyright cmassengale

    28. 28 Hydrozoan Life Cycle Most hydrozoans alternate polyp and medusa forms, as in the life cycle of Obelia copyright cmassengale

    29. 29 Obelia Life Cycle (Hydrozoan) Larva called a planula copyright cmassengale

    30. 30 Cubozoans copyright cmassengale

    31. 31 copyright cmassengale

    32. Scyphozoan Characteristics Jellyfish Medusa is dominant body form Go through small polyp stage during life cycle Stinging tentacles May live close to shore or the open ocean

    37. 37 copyright cmassengale

    38. 38 Ctenophoran Characteristics Called comb jellies All marine Approximately 100 species May be spherical, ovoid, or elongate in appearance Bioluminescent copyright cmassengale

    39. 39 Ctenophoran Characteristics Radial symmetry Have eight plates of fused cilia that resemble combs Move by beating cilia Most of the body is jelly-like mesoglea Body & tentacles covered with sticky mucus to catch prey copyright cmassengale

    40. 40 copyright cmassengale

    41. 41 copyright cmassengale

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    43. 43