Phylum : Platyhelminthes

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Phylum Platyhelminthes
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General Characteristics

• Free-living or parasitic
• Bilaterally symetrical, and dorso-ventrally
  flattened
• Epidermis has cilia or cuticle
• Coelom lacking (acoelomate)
• Digestive system incomplete
• Excretory system protonephridia
• Nervous system ladder-like

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General Characteristics

• Respiratory, circulatory, and skeletal system
  lacking
• Most monecious
• Some have fragmentation and regeneration
  (Asexual)

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Class Turbellaria
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Turbellaria

• Free-living
• Ciliated epidermis
• Mouth ventral
• Digestive system simple

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Dugesia w.m.
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Dugesia c.s.
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Class Trematoda
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Trematoda

• Endoparasites
• Cuticle covering body
• Oral sucker surrounds mouth
• Ventral sucker used for attachment
• Complex life cycles

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Clonorchis
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Sporocyst Larval stage
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Class Cestoda
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Cestoda

• Endoparasites
• Body consists of proglottids and scolex
• Proglottids snapshots of development
• Scolex has structures for attachment (Hooks,
  suckers and rostellum)
• No digestive system

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Taenia
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Taenia w.m.
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Taenia
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Proglottids