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Wormlike Animals

SBI 3U. Wormlike Animals. We are going to study…. Platyhelminthes (flatworms) Nematodes (roundworms) Annelids (segmented worms). Phylum Platyhelminthes. Flatworms Acoelomates Bilateral symmetry Cephalization True organs Free-living and parasitic.

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Wormlike Animals

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  1. SBI 3U Wormlike Animals

  2. We are going to study… • Platyhelminthes (flatworms) • Nematodes (roundworms) • Annelids (segmented worms)

  3. Phylum Platyhelminthes • Flatworms • Acoelomates • Bilateral symmetry • Cephalization • True organs • Free-living and parasitic

  4. Platyhelminthes – Free Living Flatworms • Small • “Blind” digestive system • Nervous tissue • Hermaphroditic • Ex: Planaria

  5. Platyhelminthes – Parasitic Flatworms • Dependent upon host • Little sensory reception • Digestive system absent in some • Highly developed reproductive system • Example: Flukes and Tapeworms

  6. Phylum Nematoda • Roundworms • Pseudocoelomates • Complete digestive tract • Simple nervous system • No respiratory or circulatory system • Free-living & Parasitic

  7. Phylum Nematoda: Parasitic Roundworms • Attack plants & animals • Some help humans • Ex: Ascaris

  8. Phylum Annelida • Segmented worms • Coelomates • Ex: Earthworms

  9. Earthworms and Ecology • Agriculture

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