Overview/General Morphology

• Body Structure

  Flat, non-segmented, and bilaterally symmetrical

  • Leaf-like, dorsoventrally flattened bodies
  • Other species may appear thread-like or elongated and cylindrical (Schistosomes)
• Trematodes are commonly known as?

  Flukes
• What type of digestive system do flukes have?

  Incomplete digestive system
• Do flukes have an anus?

  No anus
• What type of body cavity do flukes possess?

  No body cavity
• What circulatory and respiratory organs do flukes have?

  None
• How many suckers do flukes have?

  Two suckers
• What are the names of the two suckers in flukes?

  Anterior oral sucker and ventral acetabulum
• What is the function of the ventral acetabulum in flukes?

  Used for attachment
• What type of integument do flukes have?

  Thick integument
• What may cover the integument of flukes?

  Spines and tubercles
• What are "vitellaria" in flukes?

  Specialized reproductive organs
• What do vitellaria produce and store?

  Yolk cells
• Why are yolk cells important for flukes?

  They provide nutrients for egg development
• What type of life cycles do flukes have?

  Very complex life cycles
• What is always required as an intermediate host in fluke life cycles?

  Snails
• How do fluke life cycles vary?

  Species-dependent