1. Phylum Nematoda: The Round Worms
Over species
Cylindrical pseudocoeloemates
Have effective hydroskeleton and musculature
Inhabit aquatic areas. Most are parasitic.
Most reproduce sexually. Females can produce ~100,000 eggs a day.
Tricininella spiralis causes trichinosis in humans from under cooked pork
Parasite burrows into muscle tissue forming cysts
Hookworms and pinworms can parasitize digestive systems
Others cause heartworm and elephantiasis

2. Parasitic Nematodes:
Roundworm
Hookworm

3. Heartworms

4. Guinea Worms:

5. Elephantiasis (Filarial worm)

6. Life Cycle of Filarial Worm

7. Trichinosis

8. Phylum Nemertina Similar to flat worms Inclide proboscus worms
Acoelomate, but have functioning digestive tract
Also have a funtioning blood vascular system