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The Characteristics of Phylum Cnidaria

The Characteristics of Phylum Cnidaria

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The Characteristics of Phylum Cnidaria

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  1. The Characteristics of Phylum Cnidaria

  2. Characteristics of Phylum Cnidaria • radial symmetry • blind sac gut (= coelenteron or gastrovascular cavity) • diploblastic with mesoglea • polyp and medusa body forms • nematocysts (= specialized stinging capsules) • nerve net • lack excretory, circulatory & respiratory systems • complex life cycle • many colonial forms exhibiting polymorphism

  3. oral Radial Symmetry aboral

  4. Radial Symmetry JellyfishPhylum Cnidaria

  5. Characteristics of Phylum Cnidaria radial symmetry blind sac gut (= coelenteron or gastrovascular cavity) diploblastic with mesoglea polyp and medusa body forms nematocysts (= specialized stinging capsules) nerve net lack excretory, circulatory & respiratory systems complex life cycle many colonial forms exhibiting polymorphism

  6. Blind Sac Gut

  7. Characteristics of Phylum Cnidaria radial symmetry blind sac gut (= coelenteron or gastrovascular cavity) diploblastic with mesoglea polyp and medusa body forms nematocysts (= specialized stinging capsules) nerve net lack excretory, circulatory & respiratory systems complex life cycle many colonial forms exhibiting polymorphism

  8. Diploblastic- two germ layers Phylum Cnidaria

  9. Characteristics of Phylum Cnidaria radial symmetry blind sac gut (= coelenteron or gastrovascular cavity) diploblastic with mesoglea polyp and medusa body forms nematocysts (= specialized stinging capsules) nerve net lack excretory, circulatory & respiratory systems complex life cycle many colonial forms exhibiting polymorphism

  10. Nematocysts

  11. Nematocyst Picture Nematocyst

  12. More Nematocysts http://www.youtube.com/watch?NR=1&v=-Tp38DUjUnM&feature=endscreen

  13. Characteristics of Phylum Cnidaria radial symmetry blind sac gut (= coelenteron or gastrovascular cavity) diploblastic with mesoglea polyp and medusa body forms nematocysts (= specialized stinging capsules) nerve net lack excretory, circulatory & respiratory systems complex life cycle many colonial forms exhibiting polymorphism

  14. Nerve Net

  15. Characteristics of Phylum Cnidaria radial symmetry blind sac gut (= coelenteron or gastrovascular cavity) diploblastic with mesoglea polyp and medusa body forms nematocysts (= specialized stinging capsules) nerve net lack excretory, circulatory & respiratory systems complex life cycle many colonial forms exhibiting polymorphism

  16. Diffusion Across the Body Wall

  17. Sea Anemones

  18. Circulation in a Moon Jellyfish

  19. Characteristics of Phylum Cnidaria radial symmetry blind sac gut (= coelenteron or gastrovascular cavity) diploblastic with mesoglea polyp and medusa body forms nematocysts (= specialized stinging capsules) nerve net lack excretory, circulatory & respiratory systems complex life cycle many colonial forms exhibiting polymorphism

  20. The Cnidarian Life Cycle The Cnidarian Life Cycle

  21. Characteristics of Phylum Cnidaria radial symmetry blind sac gut (= coelenteron or gastrovascular cavity) diploblastic with mesoglea polyp and medusa body forms nematocysts (= specialized stinging capsules) nerve net lack excretory, circulatory & respiratory systems complex life cycle many colonial forms exhibiting polymorphism

  22. Coloniality and Polymorphism

  23. Poly,orphism in the Portuguese Man- of-War

  24. Coloniality CoralPhylum Cnidaria