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Platyhelminthes. By: Andrew Ibach & Jennifer Kapinus. Platyhelminthes Common Name: Flatworm. Three classes: Turbellaria Free-Living Flatworm Trematoda Flukes Cestoda Tapeworms. Body Symmetry. Bilateral If split in half, left and right, both sides would be identical to each other

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platyhelminthes

Platyhelminthes

By: Andrew Ibach & Jennifer Kapinus

platyhelminthes common name flatworm
PlatyhelminthesCommon Name:Flatworm
  • Three classes:
    • Turbellaria
      • Free-Living Flatworm
    • Trematoda
      • Flukes
    • Cestoda
      • Tapeworms
body symmetry
Body Symmetry
  • Bilateral
    • If split in half, left and right, both sides

would be identical to each other

  • Cephalization
    • Concentration of sensory equipment in one end, the head, of the organism
body plan
Body Plan
  • Dorsally, ventrally flat
  • Triplpoblastic (three tissue layers)
    • Endoderm
    • Mesoderm
    • Ectoderm
  • Acoelomate (no body cavity between the digestive cavity and outer body wall)
support movement system
Support & Movement System
  • Turbellians use cilia to move
  • Trematoda & Cestoda rely on the host\'s circulation
nutrition
Nutrition
  • One digestive opening
    • branches to all parts of the body.
      • Turbellarianshave a muscular pharynx to move food which they get from eating mollusks and worms.
      • Parasitic classes rely on the host for digestion, absorbing nutrients from the host.
gas exchange
Gas Exchange
  • No organs for respiration
    • Diffusion from body surface to body cells
excretion water balance
Excretion/ Water Balance
  • Osmotic balance with environment
    • Protonephridia
      • Networks of tubules with ciliated structure called fame bulbs that pull fluid through branched ducts opening to the outside.
reproduction
Reproduction
  • Sexual Reproduction
    • Males pierces female’s body surface and releases sperm into her
  • Asexual Reproduction
    • Budding
    • Self-fertilization
    • Fission
response to stimuli
Response to Stimuli
  • Eyespots
    • Light sensitive
  • Nerve System
    • Ganglions by eye spots
      • Nerves run all the way along body from ganglions
    • Can learn to modify responses to stimuli
defense mechanisms
Defense Mechanisms
  • Bright colors
    • Associated with bad taste due to toxins inside flatworm
      • This deters predators from attacking the brightly colored prey again.
other information
Other Information
  • Flatworms are primarily aquatic
  • Flatworms have no circulatory organs
  • There are no open cavities in a flatworm
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