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Unsegmented Worms: Flatworms and Roundworms

Unsegmented Worms: Flatworms and Roundworms. Biology 11. Worms. Divided into 2 Groups Unsegmented Flatworms Roundworms Segmented Annelids . Phylum Platyhelminthes. Platy= flat Helminth =worm The Flatworms. Characteristics. Acoelomates (no fluid filled space)

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Unsegmented Worms: Flatworms and Roundworms

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  1. Unsegmented Worms:Flatworms and Roundworms Biology 11

  2. Worms • Divided into 2 Groups • Unsegmented • Flatworms • Roundworms • Segmented • Annelids

  3. Phylum Platyhelminthes • Platy= flat • Helminth=worm • The Flatworms

  4. Characteristics • Acoelomates (no fluid filled space) • Unsegmented body (not divided into sections) • Live in aquatic habitat (streams, lake, oceans) • Free living or parasitic • Cephalization- concentration of sensory organs at one end • Bilaterally symmetrical

  5. Germ Layer • 3 cell layers- ectoderm, mesoderm, endoderm • Have a two way digestive system (lack an anus)

  6. Class Tubellaria • Free living flatworms • Marine and fresh water (a few terrestrial) • Reproduce asexually by fission and sexually are hermaphrodites

  7. Class trematoda • Parasitic flukes • Live as external and internal parasites on fish and other animals • Complex parasitic life cycle involving hosts • Hermaphrodites

  8. Class Cestoda • Parasitic tape worms • Live in intestines of vertebrates • Have scolex in “head” section that have sections called proglottids • Contain reproductive organs and fertilization takes place inside • Mature proglottids detach and pass out of the intestine

  9. Phylum Nematoda • The roundworms • Found in soil, marine, and fresh water

  10. Cylindrically shaped • Bilaterally symmetrical • 3 body layers- have pseudocoelom

  11. One way digestive system • Have mouth and anus • No circulatory or respiratory system • Fluid in pseudocoelom distributes food and oxygen • Have nerve ring around pharynx (no brain) • Have separate sexes

  12. E X T R E M E H E E B Y – J E E B I E S A H E A D !

  13. Roundworms found in dog poop

  14. Dog Heartworm

  15. Inside a chicken’s intestine

  16. Feeding • Most are free living carnivores/omnivores • Have pharynx • Can be parasites in plants and animals

  17. Respiration and Circulation • Diffusion of gases through body walls

  18. Excretion • Metabolic wastes diffuse through body walls • Undigested wastes through anus

  19. Guinea Stickworm

  20. Filarial worms • Tropical Asia • Mosquito carries worms from host to host • Cause elephantiasis

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