Platyhelminthes

Platyhelminthes

1. Phylum Platyhelminthes (Flat Worms)

   • flatness important so they can rely on diffusion across their body for feeding and resperation
   • Class Turbellaria
     • free living non parasitic flat worms
     • move via ciliated epidermis on a trail of mucus
     • eat via protrusible pharynx
   • Class Trematoda (Flukes)
     • parasitic
       • live in organs of animals
         • sheep liver fluke
         • frog lung fluke
     • hermaphroditic
   • Class Cestoidea tapeworms
     • parasitic
     • proglottids: special reproductive segments

2. First:

   • bilateral Symmetry (First with it)
   • triploblastic
     • third tissue level (mesoderm)
   • organ level system
   • cephalization

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