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Wormlike Animals

SBI 3U Ms.Zafar October 15 th. Wormlike Animals. Wormlike Animals. Invertebrates Some have a coelom. We are going to study…. Platyhelminthes (flatworms) Nematodes (roundworms) Annelids (segmented worms). Phylum Platyhelminthes. Flatworms Acoelomates Bilateral symmetry

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Wormlike Animals

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  1. SBI 3U Ms.Zafar October 15th Wormlike Animals

  2. Wormlike Animals • Invertebrates • Some have a coelom

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

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

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

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

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

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

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

  10. Earthworms and Ecology • Agriculture

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