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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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The planula hypothesis

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  1. The planula hypothesis

  2. Cnidaria • Hydrozoa • Scyphozoa • Anthozoa • Cubozoa

  3. 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 • Either polyp or medusae shaped • Alternation of generations--hydroid to a medusoid to a hydroid individual. Exception is the anthozoa • Planula larvae

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