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The Characteristics of Phylum Cnidaria

Dive into the features of Phylum Cnidaria, including radial symmetry, diploblastic structure, polyp and medusa forms, and complex life cycles. Learn about nematocysts, nerve nets, and colonial polymorphism. Discover the unique traits and fascinating world of Cnidarians.

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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

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