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Phylum Nemata : The Round-worms

Phylum Nemata : The Round-worms. What’s a Nematode?. Nematodes are different from more familiar worms (such as the earthworm) because they have no body segments. Hence the name “round” worm. Segmented Worm (Annelid). Roundworm (Nematode). So What’s Different from Flatworms?. Anus

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Phylum Nemata : The Round-worms

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  1. Phylum Nemata: The Round-worms

  2. What’s a Nematode? • Nematodes are different from more familiar worms (such as the earthworm) because they have no body segments. Hence the name “round” worm Segmented Worm (Annelid) Roundworm (Nematode)

  3. So What’s Different from Flatworms? • Anus • Pseudocoelum (body cavity) • The psudocoelum allows for the distribution of nutrients and oxygen to all of a nematode’s cells. Flatworm: No Pseudocoelum

  4. Other Nematode Characteristics • Triploblastic (Ectoderm, endoderm, and mesoderm. • Digestive system with mouth & anus. • Hard cuticle similar to an exoskeleton • Sexual reproduction (usually)

  5. Nematode Anatomy • “Tube within a tube” body plan

  6. Many species • There are many thousands, perhaps even 500,000 different nematode species on Earth, making them the 2nd most successful animal phylum by this measure. • They can be found in soil, marine, and freshwater environments on every continent. • Some species are free-living and others are parasitic

  7. Life Cycle: Egg, Larva, Adult, repeat

  8. Roundworm Ecology • Roundworms are an important part of the soil ecosystem: • 1 g of soil may contain hundreds of nematodes! • Different species eat different things, sometimes even other nematodes. • Many are beneficial because they infect the larvae of damaging insects. • Some infect plants.

  9. Bad Nematodes: Heartworm • Heartworm is a common infection of household pets, especially dogs. • Spread by mosquito bites

  10. Bad nematodes: Loa Loa (African Eye Worm) • Rare outside of Congo and Sudan, but spectacularly disgusting. May cause blindness. • Spread by biting flies

  11. Bad Nematode: Intestinal Roundworm • Infected dog intestines pictured. Some species can infect humans

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