Some other diploblastic creatures

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Some other diploblastic creatures

• Ctenophores

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Attributes of ctenophores

• Diploblastic
• Comb jellies--eight rows of ciliated plates
• Lack true nematocysts
• Active filter feeders
• Some tentacles, some lack tentacles--tentacles
  are paired structures
• planktonic

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Triplobastic creatures

• Platyhelminthes (flatworms)

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Characteristics of the Platyhelminthes

• Triploblastic--ectoderm, endoderm and mesoderm
• Acoelomate--mesenchymal (separate or syncitial)
• Gastrovascular cavity depends upon the
  group--extracellular and intracellular digestion
• Excretory system of flame cells
• Some cephalization, nerve net subepidermal.
  Ladder like set of parallel nerve fibers in the
  mesoderm

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Classes of Platyhelminthes

• Turbellaria--marine and freshwater,
  free-living--one opening gut
• Trematodes--parasitic, marine and freshwater--one
  opening gut
• Cestoda--parasitic, marine and freshwater--lack a
  digestive tract