Scyphozoa - PowerPoint PPT Presentation

Cnidarians

Cnidarians. Cnidarians - General Characteristics. Diverse: ~10,000 living species described. cnidoblasts unique to this phylum. Contains Nematocyst. Threads may wrap, stick, or poison. Cnidarians - General Characteristics. Body plan:

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The planula hypothesis

The planula hypothesis. Cnidaria. Hydrozoa Scyphozoa Anthozoa Cubozoa. Characteristics. Double-layer body wall Both layers have muscular bases Use gastrovascular cavity as skeleton--hydrostatic skeleton Cnematocysts--cnematoblast--stinging cells Mesoglea--non-cellular layer

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