Chapter 10 The Triploblastic, Acoelomate Body Plan

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Chapter 10 The Triploblastic, Acoelomate Body
Plan
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Body Wall

• Rhabdites are rodlike cells that swell and form a
  protective mucous sheath around the body,
  possible it respond to attempted predation or
  desiccation.
• Releaser gland secrete a chemical that dissolve
  the attachment as needed

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Exchanges with the Environment

• Numerous, fine side branches of the tubules
  originated in the parenchyma as tiny enlargement
  called flame cells
• The tubules eventually merge and open to the
  outside of the body wall through a minute opening
  called a nephridiopore

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Reproduction and Development

• Two or more animals that result from fission are
  called zooids, and they regenerate missing parts
  after separating from each other
• A hard capsule called a cocoon
• A few turberllarians have a free swimming stage
  called a Muller larva

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Class Trematoda

• Ten thousand species of parasitic flatworms in
  the class Trematoda are collectively called
  flukes, which describes their wide, flat shape.
• A large oval holdfast organ called the
  opisthaptor.

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Subclass Digenea

• The anterior sucker is called oral sucker and
  surround the mouth
• The other sucker, the acetabulum is located below
  the oral sucker on the middle portion of the body

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Class Cestodia the tapeworms

• Most adult tapeworm consist of a long series of
  repeating unit called proglottid